401k Plan data: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST plan

OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 401k Plan overview

Plan Name	OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST
Plan identification number	003

OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST Benefits

401k Plan Type

Defined Contribution Pension

Plan Features/Benefits

Profit-sharing
ERISA section 404(c) Plan - This plan, or any part of it is intended to meet the conditions of 29 CFR 2550.404c-1.
Total participant-directed account plan - Participants have the opportunity to direct the investment of all the assets allocated to their individual accounts, regardless of whether 29 CFR 2550.404c-1 is intended to be met.
Code section 401(k) feature - A cash or deferred arrangement described in Code section 401(k) that is part of a qualified defined contribution plan that provides for an election by employees to defer part of their compensation or receive these amounts in cash.
Code section 401(m) arrangement - Employee contributions are allocated to separate accounts under the plan or employer contributions are based, in whole or in part, on employee deferrals or contribtions to the plan. Not applicable if plan is 401(k) plan with only QNECs and/or QMACs. Also not applicable if Code section 403(b)(1), 403(b)(7) or 408 arrangements/accounts/annuities.
Plan provides for automatic enrollment in plan that has employee contributions deducted from payroll.
Total or partial participant-directed account plan - plan uses default investment account for participants who fail to direct assets in their account.
Master plan - A pension plan that is made available by a sponsor for adoption by employers; that is the subject of a favorable opinion letter; and for which a single funding medium (for example, a trust or custodial account) is established for the joint use of all adopting employers.
Prototype plan - A pension plan that is made available by a sponsor for adoption by employers; that is the subject of a favorable opinion or notification letter; and under which a seperate funding medium (for example, a seperate trust or custodial account) is established for the use of each adopting employer.
Plan sponsor(s) is (are) a member(s) of a controlled group (Code sections 414(b), (c), or (m)).

401k Sponsoring company profile

OLD SECOND BANCORP, INC has sponsored the creation of one or more 401k plans.

Company Name: OLD SECOND BANCORP, INC

Employer identification number (EIN): 363143493

NAIC Classification: 522110
NAIC Description: Commercial Banking

Form 5500 Filing Information

Submission information for form 5500 for 401k plan OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
003 2022-01-01
003 2021-01-01
003 2021-01-01
003 2021-01-01
003 2020-01-01
003 2019-01-01
003 2018-01-01
003 2017-01-01 ROBERT DICOSOLA
003 2016-01-01 ROBERT DICOSOLA
003 2015-01-01 ROBERT DICOSOLA
003 2014-01-01 ROBERT DICOSOLA
003 2013-01-01 ROBERT DICOSOLA
003 2012-01-01 ROBERT DICOSOLA
003 2011-01-01 ROBERT DICOSOLA
003 2009-01-01 BOB DICOSOLA
003 2008-01-01 BOB DICOSOLA

Plan Statistics for OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST

401k plan membership statisitcs for OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST

Measure Date Value
2022: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2022 401k membership
Total participants, beginning-of-year 2022-01-01 1,091
Total number of active participants reported on line 7a of the Form 5500 2022-01-01 808
Number of retired or separated participants receiving benefits 2022-01-01 0
Number of other retired or separated participants entitled to future benefits 2022-01-01 215
Total of all active and inactive participants 2022-01-01 1,023
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2022-01-01 0
Total participants 2022-01-01 1,023
Number of participants with account balances 2022-01-01 784
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2022-01-01 0
2021: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2021 401k membership
Total participants, beginning-of-year 2021-01-01 732
Total number of active participants reported on line 7a of the Form 5500 2021-01-01 884
Number of retired or separated participants receiving benefits 2021-01-01 0
Number of other retired or separated participants entitled to future benefits 2021-01-01 207
Total of all active and inactive participants 2021-01-01 1,091
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2021-01-01 0
Total participants 2021-01-01 1,091
Number of participants with account balances 2021-01-01 741
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2021-01-01 0
2020: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2020 401k membership
Total participants, beginning-of-year 2020-01-01 699
Total number of active participants reported on line 7a of the Form 5500 2020-01-01 530
Number of retired or separated participants receiving benefits 2020-01-01 0
Number of other retired or separated participants entitled to future benefits 2020-01-01 202
Total of all active and inactive participants 2020-01-01 732
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2020-01-01 0
Total participants 2020-01-01 732
Number of participants with account balances 2020-01-01 609
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2020-01-01 0
2019: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2019 401k membership
Total participants, beginning-of-year 2019-01-01 616
Total number of active participants reported on line 7a of the Form 5500 2019-01-01 496
Number of retired or separated participants receiving benefits 2019-01-01 0
Number of other retired or separated participants entitled to future benefits 2019-01-01 203
Total of all active and inactive participants 2019-01-01 699
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2019-01-01 0
Total participants 2019-01-01 699
Number of participants with account balances 2019-01-01 596
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2019-01-01 0
2018: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2018 401k membership
Total participants, beginning-of-year 2018-01-01 673
Total number of active participants reported on line 7a of the Form 5500 2018-01-01 384
Number of retired or separated participants receiving benefits 2018-01-01 210
Number of other retired or separated participants entitled to future benefits 2018-01-01 0
Total of all active and inactive participants 2018-01-01 594
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2018-01-01 0
Total participants 2018-01-01 594
Number of participants with account balances 2018-01-01 594
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2018-01-01 0
2017: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2017 401k membership
Total participants, beginning-of-year 2017-01-01 634
Total number of active participants reported on line 7a of the Form 5500 2017-01-01 430
Number of retired or separated participants receiving benefits 2017-01-01 0
Number of other retired or separated participants entitled to future benefits 2017-01-01 243
Total of all active and inactive participants 2017-01-01 673
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2017-01-01 0
Total participants 2017-01-01 673
Number of participants with account balances 2017-01-01 626
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2017-01-01 0
2016: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2016 401k membership
Total participants, beginning-of-year 2016-01-01 643
Total number of active participants reported on line 7a of the Form 5500 2016-01-01 443
Number of retired or separated participants receiving benefits 2016-01-01 0
Number of other retired or separated participants entitled to future benefits 2016-01-01 189
Total of all active and inactive participants 2016-01-01 632
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2016-01-01 2
Total participants 2016-01-01 634
Number of participants with account balances 2016-01-01 702
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2016-01-01 0
2015: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2015 401k membership
Total participants, beginning-of-year 2015-01-01 796
Total number of active participants reported on line 7a of the Form 5500 2015-01-01 438
Number of retired or separated participants receiving benefits 2015-01-01 0
Number of other retired or separated participants entitled to future benefits 2015-01-01 205
Total of all active and inactive participants 2015-01-01 643
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2015-01-01 0
Total participants 2015-01-01 643
Number of participants with account balances 2015-01-01 566
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2015-01-01 0
2014: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2014 401k membership
Total participants, beginning-of-year 2014-01-01 722
Total number of active participants reported on line 7a of the Form 5500 2014-01-01 473
Number of retired or separated participants receiving benefits 2014-01-01 0
Number of other retired or separated participants entitled to future benefits 2014-01-01 323
Total of all active and inactive participants 2014-01-01 796
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2014-01-01 0
Total participants 2014-01-01 796
Number of participants with account balances 2014-01-01 723
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2014-01-01 0
2013: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2013 401k membership
Total participants, beginning-of-year 2013-01-01 648
Total number of active participants reported on line 7a of the Form 5500 2013-01-01 415
Number of retired or separated participants receiving benefits 2013-01-01 1
Number of other retired or separated participants entitled to future benefits 2013-01-01 283
Total of all active and inactive participants 2013-01-01 699
Total participants 2013-01-01 699
Number of participants with account balances 2013-01-01 669
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2013-01-01 1
2012: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2012 401k membership
Total participants, beginning-of-year 2012-01-01 660
Total number of active participants reported on line 7a of the Form 5500 2012-01-01 463
Number of retired or separated participants receiving benefits 2012-01-01 23
Number of other retired or separated participants entitled to future benefits 2012-01-01 158
Total of all active and inactive participants 2012-01-01 644
Total participants 2012-01-01 644
Number of participants with account balances 2012-01-01 569
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2012-01-01 5
2011: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2011 401k membership
Total participants, beginning-of-year 2011-01-01 694
Total number of active participants reported on line 7a of the Form 5500 2011-01-01 473
Number of retired or separated participants receiving benefits 2011-01-01 8
Number of other retired or separated participants entitled to future benefits 2011-01-01 164
Total of all active and inactive participants 2011-01-01 645
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2011-01-01 2
Total participants 2011-01-01 647
Number of participants with account balances 2011-01-01 581
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2011-01-01 22
2009: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2009 401k membership
Total participants, beginning-of-year 2009-01-01 716
Total number of active participants reported on line 7a of the Form 5500 2009-01-01 524
Number of retired or separated participants receiving benefits 2009-01-01 14
Number of other retired or separated participants entitled to future benefits 2009-01-01 256
Total of all active and inactive participants 2009-01-01 794
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2009-01-01 3
Total participants 2009-01-01 797
Number of participants with account balances 2009-01-01 768
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2009-01-01 45
2008: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2008 401k membership
Total participants, beginning-of-year 2008-01-01 718
Total number of active participants reported on line 7a of the Form 5500 2008-01-01 534
Number of retired or separated participants receiving benefits 2008-01-01 3
Number of other retired or separated participants entitled to future benefits 2008-01-01 169
Total of all active and inactive participants 2008-01-01 706
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2008-01-01 1
Total participants 2008-01-01 707
Number of participants with account balances 2008-01-01 742
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2008-01-01 10

Measure	Date	Value
2022: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2022 401k membership
Total participants, beginning-of-year	2022-01-01	1,091
Total number of active participants reported on line 7a of the Form 5500	2022-01-01	808
Number of retired or separated participants receiving benefits	2022-01-01	0
Number of other retired or separated participants entitled to future benefits	2022-01-01	215
Total of all active and inactive participants	2022-01-01	1,023
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2022-01-01	0
Total participants	2022-01-01	1,023
Number of participants with account balances	2022-01-01	784
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2022-01-01	0
2021: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2021 401k membership
Total participants, beginning-of-year	2021-01-01	732
Total number of active participants reported on line 7a of the Form 5500	2021-01-01	884
Number of retired or separated participants receiving benefits	2021-01-01	0
Number of other retired or separated participants entitled to future benefits	2021-01-01	207
Total of all active and inactive participants	2021-01-01	1,091
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2021-01-01	0
Total participants	2021-01-01	1,091
Number of participants with account balances	2021-01-01	741
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2021-01-01	0
2020: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2020 401k membership
Total participants, beginning-of-year	2020-01-01	699
Total number of active participants reported on line 7a of the Form 5500	2020-01-01	530
Number of retired or separated participants receiving benefits	2020-01-01	0
Number of other retired or separated participants entitled to future benefits	2020-01-01	202
Total of all active and inactive participants	2020-01-01	732
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2020-01-01	0
Total participants	2020-01-01	732
Number of participants with account balances	2020-01-01	609
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2020-01-01	0
2019: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2019 401k membership
Total participants, beginning-of-year	2019-01-01	616
Total number of active participants reported on line 7a of the Form 5500	2019-01-01	496
Number of retired or separated participants receiving benefits	2019-01-01	0
Number of other retired or separated participants entitled to future benefits	2019-01-01	203
Total of all active and inactive participants	2019-01-01	699
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2019-01-01	0
Total participants	2019-01-01	699
Number of participants with account balances	2019-01-01	596
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2019-01-01	0
2018: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2018 401k membership
Total participants, beginning-of-year	2018-01-01	673
Total number of active participants reported on line 7a of the Form 5500	2018-01-01	384
Number of retired or separated participants receiving benefits	2018-01-01	210
Number of other retired or separated participants entitled to future benefits	2018-01-01	0
Total of all active and inactive participants	2018-01-01	594
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2018-01-01	0
Total participants	2018-01-01	594
Number of participants with account balances	2018-01-01	594
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2018-01-01	0
2017: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2017 401k membership
Total participants, beginning-of-year	2017-01-01	634
Total number of active participants reported on line 7a of the Form 5500	2017-01-01	430
Number of retired or separated participants receiving benefits	2017-01-01	0
Number of other retired or separated participants entitled to future benefits	2017-01-01	243
Total of all active and inactive participants	2017-01-01	673
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2017-01-01	0
Total participants	2017-01-01	673
Number of participants with account balances	2017-01-01	626
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2017-01-01	0
2016: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2016 401k membership
Total participants, beginning-of-year	2016-01-01	643
Total number of active participants reported on line 7a of the Form 5500	2016-01-01	443
Number of retired or separated participants receiving benefits	2016-01-01	0
Number of other retired or separated participants entitled to future benefits	2016-01-01	189
Total of all active and inactive participants	2016-01-01	632
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2016-01-01	2
Total participants	2016-01-01	634
Number of participants with account balances	2016-01-01	702
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2016-01-01	0
2015: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2015 401k membership
Total participants, beginning-of-year	2015-01-01	796
Total number of active participants reported on line 7a of the Form 5500	2015-01-01	438
Number of retired or separated participants receiving benefits	2015-01-01	0
Number of other retired or separated participants entitled to future benefits	2015-01-01	205
Total of all active and inactive participants	2015-01-01	643
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2015-01-01	0
Total participants	2015-01-01	643
Number of participants with account balances	2015-01-01	566
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2015-01-01	0
2014: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2014 401k membership
Total participants, beginning-of-year	2014-01-01	722
Total number of active participants reported on line 7a of the Form 5500	2014-01-01	473
Number of retired or separated participants receiving benefits	2014-01-01	0
Number of other retired or separated participants entitled to future benefits	2014-01-01	323
Total of all active and inactive participants	2014-01-01	796
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2014-01-01	0
Total participants	2014-01-01	796
Number of participants with account balances	2014-01-01	723
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2014-01-01	0
2013: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2013 401k membership
Total participants, beginning-of-year	2013-01-01	648
Total number of active participants reported on line 7a of the Form 5500	2013-01-01	415
Number of retired or separated participants receiving benefits	2013-01-01	1
Number of other retired or separated participants entitled to future benefits	2013-01-01	283
Total of all active and inactive participants	2013-01-01	699
Total participants	2013-01-01	699
Number of participants with account balances	2013-01-01	669
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2013-01-01	1
2012: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2012 401k membership
Total participants, beginning-of-year	2012-01-01	660
Total number of active participants reported on line 7a of the Form 5500	2012-01-01	463
Number of retired or separated participants receiving benefits	2012-01-01	23
Number of other retired or separated participants entitled to future benefits	2012-01-01	158
Total of all active and inactive participants	2012-01-01	644
Total participants	2012-01-01	644
Number of participants with account balances	2012-01-01	569
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2012-01-01	5
2011: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2011 401k membership
Total participants, beginning-of-year	2011-01-01	694
Total number of active participants reported on line 7a of the Form 5500	2011-01-01	473
Number of retired or separated participants receiving benefits	2011-01-01	8
Number of other retired or separated participants entitled to future benefits	2011-01-01	164
Total of all active and inactive participants	2011-01-01	645
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2011-01-01	2
Total participants	2011-01-01	647
Number of participants with account balances	2011-01-01	581
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2011-01-01	22
2009: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2009 401k membership
Total participants, beginning-of-year	2009-01-01	716
Total number of active participants reported on line 7a of the Form 5500	2009-01-01	524
Number of retired or separated participants receiving benefits	2009-01-01	14
Number of other retired or separated participants entitled to future benefits	2009-01-01	256
Total of all active and inactive participants	2009-01-01	794
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2009-01-01	3
Total participants	2009-01-01	797
Number of participants with account balances	2009-01-01	768
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2009-01-01	45
2008: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2008 401k membership
Total participants, beginning-of-year	2008-01-01	718
Total number of active participants reported on line 7a of the Form 5500	2008-01-01	534
Number of retired or separated participants receiving benefits	2008-01-01	3
Number of other retired or separated participants entitled to future benefits	2008-01-01	169
Total of all active and inactive participants	2008-01-01	706
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2008-01-01	1
Total participants	2008-01-01	707
Number of participants with account balances	2008-01-01	742
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2008-01-01	10

Financial Data on OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST

Measure	Date	Value
2022 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2022 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2022-12-31	$6,947
Total unrealized appreciation/depreciation of assets	2022-12-31	$6,947
Total income from all sources (including contributions)	2022-12-31	$-1,476,317
Total of all expenses incurred	2022-12-31	$9,104,933
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2022-12-31	$9,089,441
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2022-12-31	$6,759,963
Value of total assets at end of year	2022-12-31	$75,831,060
Value of total assets at beginning of year	2022-12-31	$86,412,310
Total of administrative expenses incurred including professional, contract, advisory and management fees	2022-12-31	$15,492
Total interest from all sources	2022-12-31	$26,837
Total dividends received (eg from common stock, registered investment company shares)	2022-12-31	$1,441,037
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2022-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2022-12-31	$1,268,202
Was this plan covered by a fidelity bond	2022-12-31	Yes
Value of fidelity bond cover	2022-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2022-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2022-12-31	No
Contributions received from participants	2022-12-31	$4,160,304
Participant contributions at end of year	2022-12-31	$927,949
Participant contributions at beginning of year	2022-12-31	$757,887
Income. Received or receivable in cash from other sources (including rollovers)	2022-12-31	$610,907
Total non interest bearing cash at end of year	2022-12-31	$207,585
Total non interest bearing cash at beginning of year	2022-12-31	$221,325
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Value of net income/loss	2022-12-31	$-10,581,250
Value of net assets at end of year (total assets less liabilities)	2022-12-31	$75,831,060
Value of net assets at beginning of year (total assets less liabilities)	2022-12-31	$86,412,310
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2022-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2022-12-31	No
Were any leases to which the plan was party in default or uncollectible	2022-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2022-12-31	$32,805,236
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2022-12-31	$41,783,266
Interest on participant loans	2022-12-31	$26,837
Value of interest in common/collective trusts at end of year	2022-12-31	$28,055,312
Value of interest in common/collective trusts at beginning of year	2022-12-31	$32,558,892
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2022-12-31	$428
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2022-12-31	$608
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2022-12-31	$608
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2022-12-31	$-6,174,149
Net investment gain or loss from common/collective trusts	2022-12-31	$-3,536,952
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2022-12-31	No
Was there a failure to transmit to the plan any participant contributions	2022-12-31	No
Has the plan failed to provide any benefit when due under the plan	2022-12-31	No
Assets. Invements in employer securities at end of year	2022-12-31	$13,773,019
Assets. Invements in employer securities at beginning of year	2022-12-31	$11,034,354
Contributions received in cash from employer	2022-12-31	$1,988,752
Employer contributions (assets) at end of year	2022-12-31	$61,531
Employer contributions (assets) at beginning of year	2022-12-31	$55,978
Income. Dividends from common stock	2022-12-31	$172,835
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2022-12-31	$9,089,441
Contract administrator fees	2022-12-31	$15,492
Did the plan have assets held for investment	2022-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2022-12-31	No
Opinion of an independent qualified public accountant for this plan	2022-12-31	Unqualified
Accountancy firm name	2022-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2022-12-31	381357951
2021 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2021 401k financial data
Total income from all sources (including contributions)	2021-12-31	$16,521,293
Total loss/gain on sale of assets	2021-12-31	$3,980,353
Total of all expenses incurred	2021-12-31	$7,328,740
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2021-12-31	$7,320,402
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2021-12-31	$4,358,720
Value of total assets at end of year	2021-12-31	$86,412,310
Value of total assets at beginning of year	2021-12-31	$77,219,757
Total of administrative expenses incurred including professional, contract, advisory and management fees	2021-12-31	$8,338
Total interest from all sources	2021-12-31	$25,654
Total dividends received (eg from common stock, registered investment company shares)	2021-12-31	$3,929,081
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2021-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2021-12-31	$3,790,250
Was this plan covered by a fidelity bond	2021-12-31	Yes
Value of fidelity bond cover	2021-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2021-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2021-12-31	No
Contributions received from participants	2021-12-31	$2,822,349
Participant contributions at end of year	2021-12-31	$757,887
Participant contributions at beginning of year	2021-12-31	$734,128
Participant contributions at beginning of year	2021-12-31	$82,897
Income. Received or receivable in cash from other sources (including rollovers)	2021-12-31	$165,592
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2021-12-31	$1,178
Total non interest bearing cash at end of year	2021-12-31	$221,325
Total non interest bearing cash at beginning of year	2021-12-31	$6,261
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Value of net income/loss	2021-12-31	$9,192,553
Value of net assets at end of year (total assets less liabilities)	2021-12-31	$86,412,310
Value of net assets at beginning of year (total assets less liabilities)	2021-12-31	$77,219,757
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2021-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2021-12-31	No
Were any leases to which the plan was party in default or uncollectible	2021-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2021-12-31	$41,783,266
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2021-12-31	$36,100,886
Interest on participant loans	2021-12-31	$25,654
Value of interest in common/collective trusts at end of year	2021-12-31	$32,558,892
Value of interest in common/collective trusts at beginning of year	2021-12-31	$31,199,263
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2021-12-31	$608
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2021-12-31	$784
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2021-12-31	$784
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2021-12-31	$1,394,842
Net investment gain or loss from common/collective trusts	2021-12-31	$2,832,643
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2021-12-31	No
Was there a failure to transmit to the plan any participant contributions	2021-12-31	No
Has the plan failed to provide any benefit when due under the plan	2021-12-31	No
Assets. Invements in employer securities at end of year	2021-12-31	$11,034,354
Assets. Invements in employer securities at beginning of year	2021-12-31	$8,993,141
Contributions received in cash from employer	2021-12-31	$1,370,779
Employer contributions (assets) at end of year	2021-12-31	$55,978
Employer contributions (assets) at beginning of year	2021-12-31	$101,219
Income. Dividends from common stock	2021-12-31	$138,831
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2021-12-31	$7,320,402
Contract administrator fees	2021-12-31	$8,338
Did the plan have assets held for investment	2021-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2021-12-31	No
Aggregate proceeds on sale of assets	2021-12-31	$26,379,352
Aggregate carrying amount (costs) on sale of assets	2021-12-31	$22,398,999
Opinion of an independent qualified public accountant for this plan	2021-12-31	Unqualified
Accountancy firm name	2021-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2021-12-31	381357951
2020 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2020 401k financial data
Total income from all sources (including contributions)	2020-12-31	$10,769,893
Total loss/gain on sale of assets	2020-12-31	$-213,230
Total of all expenses incurred	2020-12-31	$4,296,903
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2020-12-31	$4,290,166
Value of total corrective distributions	2020-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2020-12-31	$4,207,138
Value of total assets at end of year	2020-12-31	$77,219,757
Value of total assets at beginning of year	2020-12-31	$70,746,767
Total of administrative expenses incurred including professional, contract, advisory and management fees	2020-12-31	$6,737
Total interest from all sources	2020-12-31	$28,990
Total dividends received (eg from common stock, registered investment company shares)	2020-12-31	$2,409,300
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2020-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2020-12-31	$2,373,950
Was this plan covered by a fidelity bond	2020-12-31	Yes
Value of fidelity bond cover	2020-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2020-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2020-12-31	No
Contributions received from participants	2020-12-31	$2,551,383
Participant contributions at end of year	2020-12-31	$734,128
Participant contributions at beginning of year	2020-12-31	$737,664
Participant contributions at end of year	2020-12-31	$82,897
Income. Received or receivable in cash from other sources (including rollovers)	2020-12-31	$383,480
Value of other receiveables (less allowance for doubtful accounts) at end of year	2020-12-31	$1,178
Total non interest bearing cash at end of year	2020-12-31	$6,261
Total non interest bearing cash at beginning of year	2020-12-31	$181,078
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Value of net income/loss	2020-12-31	$6,472,990
Value of net assets at end of year (total assets less liabilities)	2020-12-31	$77,219,757
Value of net assets at beginning of year (total assets less liabilities)	2020-12-31	$70,746,767
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2020-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2020-12-31	No
Were any leases to which the plan was party in default or uncollectible	2020-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2020-12-31	$36,100,886
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2020-12-31	$29,534,801
Interest on participant loans	2020-12-31	$28,990
Value of interest in common/collective trusts at end of year	2020-12-31	$31,199,263
Value of interest in common/collective trusts at beginning of year	2020-12-31	$27,826,193
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2020-12-31	$784
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2020-12-31	$916
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2020-12-31	$916
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2020-12-31	$1,128,557
Net investment gain or loss from common/collective trusts	2020-12-31	$3,209,138
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2020-12-31	No
Was there a failure to transmit to the plan any participant contributions	2020-12-31	No
Has the plan failed to provide any benefit when due under the plan	2020-12-31	No
Assets. Invements in employer securities at end of year	2020-12-31	$8,993,141
Assets. Invements in employer securities at beginning of year	2020-12-31	$12,417,010
Contributions received in cash from employer	2020-12-31	$1,272,275
Employer contributions (assets) at end of year	2020-12-31	$101,219
Employer contributions (assets) at beginning of year	2020-12-31	$49,105
Income. Dividends from common stock	2020-12-31	$35,350
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2020-12-31	$4,290,166
Contract administrator fees	2020-12-31	$6,737
Did the plan have assets held for investment	2020-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2020-12-31	No
Aggregate proceeds on sale of assets	2020-12-31	$16,076,948
Aggregate carrying amount (costs) on sale of assets	2020-12-31	$16,290,178
Opinion of an independent qualified public accountant for this plan	2020-12-31	Unqualified
Accountancy firm name	2020-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2020-12-31	351357951
2019 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2019 401k financial data
Total income from all sources (including contributions)	2019-12-31	$14,310,452
Total loss/gain on sale of assets	2019-12-31	$1,317,297
Total of all expenses incurred	2019-12-31	$7,046,511
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2019-12-31	$7,038,104
Value of total corrective distributions	2019-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2019-12-31	$3,901,027
Value of total assets at end of year	2019-12-31	$70,746,767
Value of total assets at beginning of year	2019-12-31	$63,482,826
Total of administrative expenses incurred including professional, contract, advisory and management fees	2019-12-31	$8,407
Total interest from all sources	2019-12-31	$28,256
Total dividends received (eg from common stock, registered investment company shares)	2019-12-31	$1,678,871
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2019-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2019-12-31	$1,640,133
Was this plan covered by a fidelity bond	2019-12-31	Yes
Value of fidelity bond cover	2019-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2019-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2019-12-31	No
Contributions received from participants	2019-12-31	$2,289,129
Participant contributions at end of year	2019-12-31	$737,664
Participant contributions at beginning of year	2019-12-31	$729,683
Income. Received or receivable in cash from other sources (including rollovers)	2019-12-31	$466,143
Total non interest bearing cash at end of year	2019-12-31	$181,078
Total non interest bearing cash at beginning of year	2019-12-31	$135,299
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Value of net income/loss	2019-12-31	$7,263,941
Value of net assets at end of year (total assets less liabilities)	2019-12-31	$70,746,767
Value of net assets at beginning of year (total assets less liabilities)	2019-12-31	$63,482,826
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2019-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2019-12-31	No
Were any leases to which the plan was party in default or uncollectible	2019-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2019-12-31	$29,534,801
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2019-12-31	$24,196,389
Interest on participant loans	2019-12-31	$28,256
Value of interest in common/collective trusts at end of year	2019-12-31	$27,826,193
Value of interest in common/collective trusts at beginning of year	2019-12-31	$25,385,946
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2019-12-31	$916
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2019-12-31	$575
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2019-12-31	$575
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2019-12-31	$4,313,382
Net investment gain or loss from common/collective trusts	2019-12-31	$3,071,619
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2019-12-31	No
Was there a failure to transmit to the plan any participant contributions	2019-12-31	No
Has the plan failed to provide any benefit when due under the plan	2019-12-31	No
Assets. Invements in employer securities at end of year	2019-12-31	$12,417,010
Assets. Invements in employer securities at beginning of year	2019-12-31	$12,991,095
Contributions received in cash from employer	2019-12-31	$1,145,755
Employer contributions (assets) at end of year	2019-12-31	$49,105
Employer contributions (assets) at beginning of year	2019-12-31	$43,839
Income. Dividends from common stock	2019-12-31	$38,738
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2019-12-31	$7,038,104
Contract administrator fees	2019-12-31	$8,407
Did the plan have assets held for investment	2019-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2019-12-31	No
Aggregate proceeds on sale of assets	2019-12-31	$16,623,270
Aggregate carrying amount (costs) on sale of assets	2019-12-31	$15,305,973
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2019-12-31	No
Opinion of an independent qualified public accountant for this plan	2019-12-31	Unqualified
Accountancy firm name	2019-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2019-12-31	351357951
2018 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2018 401k financial data
Total income from all sources (including contributions)	2018-12-31	$1,332,496
Total loss/gain on sale of assets	2018-12-31	$1,728,604
Total of all expenses incurred	2018-12-31	$6,636,272
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2018-12-31	$6,623,525
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2018-12-31	$5,006,850
Value of total assets at end of year	2018-12-31	$63,482,826
Value of total assets at beginning of year	2018-12-31	$68,786,602
Total of administrative expenses incurred including professional, contract, advisory and management fees	2018-12-31	$12,747
Total interest from all sources	2018-12-31	$26,901
Total dividends received (eg from common stock, registered investment company shares)	2018-12-31	$1,858,786
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2018-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2018-12-31	$1,858,786
Was this plan covered by a fidelity bond	2018-12-31	Yes
Value of fidelity bond cover	2018-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2018-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2018-12-31	No
Contributions received from participants	2018-12-31	$2,094,230
Participant contributions at end of year	2018-12-31	$729,683
Participant contributions at beginning of year	2018-12-31	$664,174
Income. Received or receivable in cash from other sources (including rollovers)	2018-12-31	$1,843,264
Total non interest bearing cash at end of year	2018-12-31	$135,299
Total non interest bearing cash at beginning of year	2018-12-31	$176,762
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Value of net income/loss	2018-12-31	$-5,303,776
Value of net assets at end of year (total assets less liabilities)	2018-12-31	$63,482,826
Value of net assets at beginning of year (total assets less liabilities)	2018-12-31	$68,786,602
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2018-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2018-12-31	No
Were any leases to which the plan was party in default or uncollectible	2018-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2018-12-31	$24,196,389
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2018-12-31	$27,809,526
Interest on participant loans	2018-12-31	$26,901
Value of interest in common/collective trusts at end of year	2018-12-31	$25,385,946
Value of interest in common/collective trusts at beginning of year	2018-12-31	$25,630,727
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2018-12-31	$575
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2018-12-31	$3,706
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2018-12-31	$3,706
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2018-12-31	$-6,130,654
Net investment gain or loss from common/collective trusts	2018-12-31	$-1,157,991
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2018-12-31	No
Was there a failure to transmit to the plan any participant contributions	2018-12-31	No
Has the plan failed to provide any benefit when due under the plan	2018-12-31	No
Assets. Invements in employer securities at end of year	2018-12-31	$12,991,095
Assets. Invements in employer securities at beginning of year	2018-12-31	$14,450,354
Contributions received in cash from employer	2018-12-31	$1,069,356
Employer contributions (assets) at end of year	2018-12-31	$43,839
Employer contributions (assets) at beginning of year	2018-12-31	$51,353
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2018-12-31	$6,623,525
Contract administrator fees	2018-12-31	$12,747
Did the plan have assets held for investment	2018-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2018-12-31	No
Aggregate proceeds on sale of assets	2018-12-31	$22,659,588
Aggregate carrying amount (costs) on sale of assets	2018-12-31	$20,930,984
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2018-12-31	No
Opinion of an independent qualified public accountant for this plan	2018-12-31	Unqualified
Accountancy firm name	2018-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2018-12-31	381357951
2017 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2017 401k financial data
Total income from all sources (including contributions)	2017-12-31	$12,782,863
Total loss/gain on sale of assets	2017-12-31	$1,232,980
Total of all expenses incurred	2017-12-31	$4,496,780
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-12-31	$4,489,079
Value of total corrective distributions	2017-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2017-12-31	$2,871,057
Value of total assets at end of year	2017-12-31	$68,786,602
Value of total assets at beginning of year	2017-12-31	$60,500,519
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-12-31	$7,701
Total interest from all sources	2017-12-31	$23,527
Total dividends received (eg from common stock, registered investment company shares)	2017-12-31	$1,204,059
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2017-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2017-12-31	$1,204,059
Was this plan covered by a fidelity bond	2017-12-31	Yes
Value of fidelity bond cover	2017-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2017-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2017-12-31	No
Contributions received from participants	2017-12-31	$1,810,323
Participant contributions at end of year	2017-12-31	$664,174
Participant contributions at beginning of year	2017-12-31	$754,840
Income. Received or receivable in cash from other sources (including rollovers)	2017-12-31	$278,631
Total non interest bearing cash at end of year	2017-12-31	$176,762
Total non interest bearing cash at beginning of year	2017-12-31	$145,136
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Value of net income/loss	2017-12-31	$8,286,083
Value of net assets at end of year (total assets less liabilities)	2017-12-31	$68,786,602
Value of net assets at beginning of year (total assets less liabilities)	2017-12-31	$60,500,519
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2017-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2017-12-31	No
Were any leases to which the plan was party in default or uncollectible	2017-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-12-31	$27,809,526
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-12-31	$22,576,336
Interest on participant loans	2017-12-31	$23,527
Value of interest in common/collective trusts at end of year	2017-12-31	$25,630,727
Value of interest in common/collective trusts at beginning of year	2017-12-31	$23,933,119
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2017-12-31	$3,706
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2017-12-31	$1,453
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2017-12-31	$1,453
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-12-31	$2,205,372
Net investment gain or loss from common/collective trusts	2017-12-31	$5,245,868
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2017-12-31	No
Was there a failure to transmit to the plan any participant contributions	2017-12-31	No
Has the plan failed to provide any benefit when due under the plan	2017-12-31	No
Assets. Invements in employer securities at end of year	2017-12-31	$14,450,354
Assets. Invements in employer securities at beginning of year	2017-12-31	$13,051,431
Contributions received in cash from employer	2017-12-31	$782,103
Employer contributions (assets) at end of year	2017-12-31	$51,353
Employer contributions (assets) at beginning of year	2017-12-31	$38,204
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2017-12-31	$4,489,079
Contract administrator fees	2017-12-31	$7,701
Did the plan have assets held for investment	2017-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2017-12-31	No
Aggregate proceeds on sale of assets	2017-12-31	$10,841,973
Aggregate carrying amount (costs) on sale of assets	2017-12-31	$9,608,993
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2017-12-31	No
Opinion of an independent qualified public accountant for this plan	2017-12-31	Unqualified
Accountancy firm name	2017-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2017-12-31	381357951
2016 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2016 401k financial data
Total income from all sources (including contributions)	2016-12-31	$10,163,804
Total loss/gain on sale of assets	2016-12-31	$69,398
Total of all expenses incurred	2016-12-31	$4,899,313
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2016-12-31	$4,840,545
Value of total corrective distributions	2016-12-31	$50,013
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2016-12-31	$3,359,553
Value of total assets at end of year	2016-12-31	$60,500,519
Value of total assets at beginning of year	2016-12-31	$55,236,028
Total of administrative expenses incurred including professional, contract, advisory and management fees	2016-12-31	$8,755
Total interest from all sources	2016-12-31	$25,911
Total dividends received (eg from common stock, registered investment company shares)	2016-12-31	$882,074
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2016-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2016-12-31	$845,926
Was this plan covered by a fidelity bond	2016-12-31	Yes
Value of fidelity bond cover	2016-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2016-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2016-12-31	No
Contributions received from participants	2016-12-31	$1,639,175
Participant contributions at end of year	2016-12-31	$754,840
Participant contributions at beginning of year	2016-12-31	$743,509
Income. Received or receivable in cash from other sources (including rollovers)	2016-12-31	$1,014,740
Total non interest bearing cash at end of year	2016-12-31	$145,136
Total non interest bearing cash at beginning of year	2016-12-31	$87,358
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2016-12-31	No
Value of net income/loss	2016-12-31	$5,264,491
Value of net assets at end of year (total assets less liabilities)	2016-12-31	$60,500,519
Value of net assets at beginning of year (total assets less liabilities)	2016-12-31	$55,236,028
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2016-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2016-12-31	No
Were any leases to which the plan was party in default or uncollectible	2016-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2016-12-31	$22,576,336
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2016-12-31	$20,445,284
Interest on participant loans	2016-12-31	$25,911
Value of interest in common/collective trusts at end of year	2016-12-31	$23,933,119
Value of interest in common/collective trusts at beginning of year	2016-12-31	$20,934,695
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2016-12-31	$1,453
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2016-12-31	$3,334,015
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2016-12-31	$3,334,015
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2016-12-31	$4,962,918
Net investment gain or loss from common/collective trusts	2016-12-31	$863,950
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2016-12-31	No
Was there a failure to transmit to the plan any participant contributions	2016-12-31	No
Has the plan failed to provide any benefit when due under the plan	2016-12-31	No
Assets. Invements in employer securities at end of year	2016-12-31	$13,051,431
Assets. Invements in employer securities at beginning of year	2016-12-31	$9,683,038
Contributions received in cash from employer	2016-12-31	$705,638
Employer contributions (assets) at end of year	2016-12-31	$38,204
Employer contributions (assets) at beginning of year	2016-12-31	$8,129
Income. Dividends from common stock	2016-12-31	$36,148
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2016-12-31	$4,840,545
Contract administrator fees	2016-12-31	$8,755
Did the plan have assets held for investment	2016-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2016-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2016-12-31	No
Aggregate proceeds on sale of assets	2016-12-31	$16,676,388
Aggregate carrying amount (costs) on sale of assets	2016-12-31	$16,606,990
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2016-12-31	No
Opinion of an independent qualified public accountant for this plan	2016-12-31	Unqualified
Accountancy firm name	2016-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2016-12-31	381357951
2015 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2015 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2015-12-31	$818,562
Total unrealized appreciation/depreciation of assets	2015-12-31	$818,562
Total income from all sources (including contributions)	2015-12-31	$4,122,494
Total loss/gain on sale of assets	2015-12-31	$85,727
Total of all expenses incurred	2015-12-31	$3,179,031
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2015-12-31	$3,167,228
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2015-12-31	$2,056,492
Value of total assets at end of year	2015-12-31	$55,236,028
Value of total assets at beginning of year	2015-12-31	$54,292,565
Total of administrative expenses incurred including professional, contract, advisory and management fees	2015-12-31	$11,803
Total interest from all sources	2015-12-31	$23,771
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2015-12-31	No
Administrative expenses professional fees incurred	2015-12-31	$11,803
Was this plan covered by a fidelity bond	2015-12-31	Yes
Value of fidelity bond cover	2015-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2015-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2015-12-31	No
Contributions received from participants	2015-12-31	$1,564,787
Participant contributions at end of year	2015-12-31	$743,509
Participant contributions at beginning of year	2015-12-31	$670,445
Income. Received or receivable in cash from other sources (including rollovers)	2015-12-31	$27,201
Total non interest bearing cash at end of year	2015-12-31	$87,358
Total non interest bearing cash at beginning of year	2015-12-31	$93,825
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2015-12-31	No
Value of net income/loss	2015-12-31	$943,463
Value of net assets at end of year (total assets less liabilities)	2015-12-31	$55,236,028
Value of net assets at beginning of year (total assets less liabilities)	2015-12-31	$54,292,565
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2015-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2015-12-31	No
Were any leases to which the plan was party in default or uncollectible	2015-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2015-12-31	$20,445,284
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2015-12-31	$20,330,544
Interest on participant loans	2015-12-31	$23,462
Value of interest in common/collective trusts at end of year	2015-12-31	$20,934,695
Value of interest in common/collective trusts at beginning of year	2015-12-31	$22,724,802
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2015-12-31	$3,334,015
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2015-12-31	$3,281,616
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2015-12-31	$3,281,616
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2015-12-31	$309
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2015-12-31	$1,128,172
Net investment gain or loss from common/collective trusts	2015-12-31	$9,770
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2015-12-31	No
Was there a failure to transmit to the plan any participant contributions	2015-12-31	No
Has the plan failed to provide any benefit when due under the plan	2015-12-31	No
Assets. Invements in employer securities at end of year	2015-12-31	$9,683,038
Assets. Invements in employer securities at beginning of year	2015-12-31	$7,165,620
Contributions received in cash from employer	2015-12-31	$464,504
Employer contributions (assets) at end of year	2015-12-31	$8,129
Employer contributions (assets) at beginning of year	2015-12-31	$25,713
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2015-12-31	$3,167,228
Did the plan have assets held for investment	2015-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2015-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2015-12-31	No
Aggregate proceeds on sale of assets	2015-12-31	$10,079,237
Aggregate carrying amount (costs) on sale of assets	2015-12-31	$9,993,510
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2015-12-31	No
Opinion of an independent qualified public accountant for this plan	2015-12-31	Unqualified
Accountancy firm name	2015-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2015-12-31	381357951
2014 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2014 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2014-12-31	$1,963,253
Total unrealized appreciation/depreciation of assets	2014-12-31	$1,963,253
Total income from all sources (including contributions)	2014-12-31	$6,002,023
Total loss/gain on sale of assets	2014-12-31	$81,363
Total of all expenses incurred	2014-12-31	$3,201,921
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2014-12-31	$3,154,651
Expenses. Certain deemed distributions of participant loans	2014-12-31	$24,826
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2014-12-31	$2,346,739
Value of total assets at end of year	2014-12-31	$54,292,565
Value of total assets at beginning of year	2014-12-31	$51,492,463
Total of administrative expenses incurred including professional, contract, advisory and management fees	2014-12-31	$22,444
Total interest from all sources	2014-12-31	$21,742
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2014-12-31	No
Administrative expenses professional fees incurred	2014-12-31	$22,444
Was this plan covered by a fidelity bond	2014-12-31	Yes
Value of fidelity bond cover	2014-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2014-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2014-12-31	No
Contributions received from participants	2014-12-31	$1,511,111
Participant contributions at end of year	2014-12-31	$670,445
Participant contributions at beginning of year	2014-12-31	$722,192
Income. Received or receivable in cash from other sources (including rollovers)	2014-12-31	$358,444
Other income not declared elsewhere	2014-12-31	$-52,643
Total non interest bearing cash at end of year	2014-12-31	$93,825
Total non interest bearing cash at beginning of year	2014-12-31	$100,381
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2014-12-31	No
Value of net income/loss	2014-12-31	$2,800,102
Value of net assets at end of year (total assets less liabilities)	2014-12-31	$54,292,565
Value of net assets at beginning of year (total assets less liabilities)	2014-12-31	$51,492,463
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2014-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2014-12-31	No
Were any leases to which the plan was party in default or uncollectible	2014-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2014-12-31	$20,330,544
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2014-12-31	$18,656,007
Interest on participant loans	2014-12-31	$21,742
Value of interest in common/collective trusts at end of year	2014-12-31	$22,724,802
Value of interest in common/collective trusts at beginning of year	2014-12-31	$21,717,127
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2014-12-31	$3,281,616
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2014-12-31	$3,706,394
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2014-12-31	$3,706,394
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2014-12-31	$1,628,145
Net investment gain or loss from common/collective trusts	2014-12-31	$13,424
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2014-12-31	No
Was there a failure to transmit to the plan any participant contributions	2014-12-31	No
Has the plan failed to provide any benefit when due under the plan	2014-12-31	No
Assets. Invements in employer securities at end of year	2014-12-31	$7,165,620
Assets. Invements in employer securities at beginning of year	2014-12-31	$6,564,767
Contributions received in cash from employer	2014-12-31	$477,184
Employer contributions (assets) at end of year	2014-12-31	$25,713
Employer contributions (assets) at beginning of year	2014-12-31	$25,595
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2014-12-31	$3,154,651
Did the plan have assets held for investment	2014-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2014-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2014-12-31	No
Aggregate proceeds on sale of assets	2014-12-31	$15,759,126
Aggregate carrying amount (costs) on sale of assets	2014-12-31	$15,677,763
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2014-12-31	No
Opinion of an independent qualified public accountant for this plan	2014-12-31	Unqualified
Accountancy firm name	2014-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2014-12-31	381357951
2013 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2013 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2013-12-31	$4,611,107
Total unrealized appreciation/depreciation of assets	2013-12-31	$4,611,107
Total income from all sources (including contributions)	2013-12-31	$18,792,689
Total loss/gain on sale of assets	2013-12-31	$-1,096,782
Total of all expenses incurred	2013-12-31	$6,446,539
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2013-12-31	$6,425,277
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2013-12-31	$1,936,552
Value of total assets at end of year	2013-12-31	$51,492,463
Value of total assets at beginning of year	2013-12-31	$39,146,313
Total of administrative expenses incurred including professional, contract, advisory and management fees	2013-12-31	$21,262
Total interest from all sources	2013-12-31	$5,107,773
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2013-12-31	No
Administrative expenses professional fees incurred	2013-12-31	$21,262
Was this plan covered by a fidelity bond	2013-12-31	Yes
Value of fidelity bond cover	2013-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2013-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2013-12-31	No
Contributions received from participants	2013-12-31	$1,457,214
Participant contributions at end of year	2013-12-31	$722,192
Participant contributions at beginning of year	2013-12-31	$691,824
Income. Received or receivable in cash from other sources (including rollovers)	2013-12-31	$9,203
Total non interest bearing cash at end of year	2013-12-31	$100,381
Total non interest bearing cash at beginning of year	2013-12-31	$88,888
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2013-12-31	No
Income. Non cash contributions	2013-12-31	$-23,173
Value of net income/loss	2013-12-31	$12,346,150
Value of net assets at end of year (total assets less liabilities)	2013-12-31	$51,492,463
Value of net assets at beginning of year (total assets less liabilities)	2013-12-31	$39,146,313
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2013-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2013-12-31	No
Were any leases to which the plan was party in default or uncollectible	2013-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2013-12-31	$18,656,007
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2013-12-31	$13,933,477
Interest on participant loans	2013-12-31	$26,251
Interest earned on other investments	2013-12-31	$5,081,117
Value of interest in common/collective trusts at end of year	2013-12-31	$21,717,127
Value of interest in common/collective trusts at beginning of year	2013-12-31	$17,444,368
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2013-12-31	$3,706,394
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2013-12-31	$5,077,996
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2013-12-31	$5,077,996
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2013-12-31	$405
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2013-12-31	$6,339,250
Net investment gain or loss from common/collective trusts	2013-12-31	$1,894,789
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2013-12-31	No
Was there a failure to transmit to the plan any participant contributions	2013-12-31	No
Has the plan failed to provide any benefit when due under the plan	2013-12-31	No
Assets. Invements in employer securities at end of year	2013-12-31	$6,564,767
Assets. Invements in employer securities at beginning of year	2013-12-31	$1,909,760
Contributions received in cash from employer	2013-12-31	$493,308
Employer contributions (assets) at end of year	2013-12-31	$25,595
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2013-12-31	$6,425,277
Did the plan have assets held for investment	2013-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2013-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2013-12-31	No
Aggregate proceeds on sale of assets	2013-12-31	$1,251,567
Aggregate carrying amount (costs) on sale of assets	2013-12-31	$2,348,349
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2013-12-31	No
Opinion of an independent qualified public accountant for this plan	2013-12-31	Unqualified
Accountancy firm name	2013-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2013-12-31	381357951
2012 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2012 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2012-12-31	$919,670
Total unrealized appreciation/depreciation of assets	2012-12-31	$919,670
Total income from all sources (including contributions)	2012-12-31	$4,733,180
Total loss/gain on sale of assets	2012-12-31	$-904,267
Total of all expenses incurred	2012-12-31	$2,149,529
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2012-12-31	$2,134,698
Value of total corrective distributions	2012-12-31	$1,542
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2012-12-31	$1,891,066
Value of total assets at end of year	2012-12-31	$39,146,313
Value of total assets at beginning of year	2012-12-31	$36,562,662
Total of administrative expenses incurred including professional, contract, advisory and management fees	2012-12-31	$13,289
Total interest from all sources	2012-12-31	$27,405
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2012-12-31	No
Administrative expenses professional fees incurred	2012-12-31	$13,289
Was this plan covered by a fidelity bond	2012-12-31	Yes
Value of fidelity bond cover	2012-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2012-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2012-12-31	No
Contributions received from participants	2012-12-31	$1,444,674
Participant contributions at end of year	2012-12-31	$691,824
Participant contributions at beginning of year	2012-12-31	$785,709
Income. Received or receivable in cash from other sources (including rollovers)	2012-12-31	$5,439
Total non interest bearing cash at end of year	2012-12-31	$88,888
Total non interest bearing cash at beginning of year	2012-12-31	$78,592
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2012-12-31	No
Value of net income/loss	2012-12-31	$2,583,651
Value of net assets at end of year (total assets less liabilities)	2012-12-31	$39,146,313
Value of net assets at beginning of year (total assets less liabilities)	2012-12-31	$36,562,662
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2012-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2012-12-31	No
Were any leases to which the plan was party in default or uncollectible	2012-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2012-12-31	$13,933,477
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2012-12-31	$10,861,909
Interest on participant loans	2012-12-31	$26,833
Value of interest in common/collective trusts at end of year	2012-12-31	$17,444,368
Value of interest in common/collective trusts at beginning of year	2012-12-31	$16,350,649
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2012-12-31	$5,077,996
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2012-12-31	$6,632,081
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2012-12-31	$6,632,081
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2012-12-31	$572
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2012-12-31	$1,717,822
Net investment gain or loss from common/collective trusts	2012-12-31	$1,081,484
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2012-12-31	No
Was there a failure to transmit to the plan any participant contributions	2012-12-31	No
Has the plan failed to provide any benefit when due under the plan	2012-12-31	No
Assets. Invements in employer securities at end of year	2012-12-31	$1,909,760
Assets. Invements in employer securities at beginning of year	2012-12-31	$1,853,722
Contributions received in cash from employer	2012-12-31	$440,953
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2012-12-31	$2,134,698
Did the plan have assets held for investment	2012-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2012-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2012-12-31	No
Aggregate proceeds on sale of assets	2012-12-31	$151,834
Aggregate carrying amount (costs) on sale of assets	2012-12-31	$1,056,101
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2012-12-31	No
Opinion of an independent qualified public accountant for this plan	2012-12-31	Unqualified
Accountancy firm name	2012-12-31	PLANTE & MORAN PLLC
Accountancy firm EIN	2012-12-31	381357951
2011 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2011 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2011-12-31	$2,466,637
Total unrealized appreciation/depreciation of assets	2011-12-31	$2,466,637
Total income from all sources (including contributions)	2011-12-31	$661,285
Total loss/gain on sale of assets	2011-12-31	$-2,806,635
Total of all expenses incurred	2011-12-31	$7,277,534
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2011-12-31	$7,267,879
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2011-12-31	$1,983,227
Value of total assets at end of year	2011-12-31	$36,562,662
Value of total assets at beginning of year	2011-12-31	$43,178,911
Total of administrative expenses incurred including professional, contract, advisory and management fees	2011-12-31	$9,655
Total interest from all sources	2011-12-31	$30,573
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2011-12-31	No
Administrative expenses professional fees incurred	2011-12-31	$9,655
Was this plan covered by a fidelity bond	2011-12-31	Yes
Value of fidelity bond cover	2011-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2011-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2011-12-31	No
Contributions received from participants	2011-12-31	$1,484,306
Participant contributions at end of year	2011-12-31	$785,709
Participant contributions at beginning of year	2011-12-31	$804,816
Income. Received or receivable in cash from other sources (including rollovers)	2011-12-31	$4,739
Total non interest bearing cash at end of year	2011-12-31	$78,592
Total non interest bearing cash at beginning of year	2011-12-31	$110,727
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2011-12-31	No
Value of net income/loss	2011-12-31	$-6,616,249
Value of net assets at end of year (total assets less liabilities)	2011-12-31	$36,562,662
Value of net assets at beginning of year (total assets less liabilities)	2011-12-31	$43,178,911
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2011-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2011-12-31	No
Were any leases to which the plan was party in default or uncollectible	2011-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2011-12-31	$10,861,909
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2011-12-31	$12,940,630
Interest on participant loans	2011-12-31	$29,913
Value of interest in common/collective trusts at end of year	2011-12-31	$16,350,649
Value of interest in common/collective trusts at beginning of year	2011-12-31	$19,047,445
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2011-12-31	$6,632,081
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2011-12-31	$8,156,699
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2011-12-31	$8,156,699
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2011-12-31	$660
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2011-12-31	$-884,052
Net investment gain or loss from common/collective trusts	2011-12-31	$-128,465
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2011-12-31	No
Was there a failure to transmit to the plan any participant contributions	2011-12-31	No
Has the plan failed to provide any benefit when due under the plan	2011-12-31	No
Assets. Invements in employer securities at end of year	2011-12-31	$1,853,722
Assets. Invements in employer securities at beginning of year	2011-12-31	$2,104,804
Contributions received in cash from employer	2011-12-31	$494,182
Employer contributions (assets) at beginning of year	2011-12-31	$13,790
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2011-12-31	$7,267,879
Did the plan have assets held for investment	2011-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2011-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2011-12-31	No
Aggregate proceeds on sale of assets	2011-12-31	$329,624
Aggregate carrying amount (costs) on sale of assets	2011-12-31	$3,136,259
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2011-12-31	No
Opinion of an independent qualified public accountant for this plan	2011-12-31	Unqualified
Accountancy firm name	2011-12-31	PLANTE & MORAN. PLLC
Accountancy firm EIN	2011-12-31	381357951
2010 : OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2010 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2010-12-31	$-6,836,409
Total unrealized appreciation/depreciation of assets	2010-12-31	$-6,836,409
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2010-12-31	$0
Total income from all sources (including contributions)	2010-12-31	$-1,590,749
Total loss/gain on sale of assets	2010-12-31	$-3,395,114
Total of all expenses incurred	2010-12-31	$5,127,914
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2010-12-31	$5,114,182
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2010-12-31	$2,535,793
Value of total assets at end of year	2010-12-31	$43,178,911
Value of total assets at beginning of year	2010-12-31	$49,897,574
Total of administrative expenses incurred including professional, contract, advisory and management fees	2010-12-31	$13,732
Total interest from all sources	2010-12-31	$32,424
Total dividends received (eg from common stock, registered investment company shares)	2010-12-31	$27,009
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2010-12-31	No
Administrative expenses professional fees incurred	2010-12-31	$13,724
Was this plan covered by a fidelity bond	2010-12-31	Yes
Value of fidelity bond cover	2010-12-31	$9,000,000
If this is an individual account plan, was there a blackout period	2010-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2010-12-31	No
Contributions received from participants	2010-12-31	$1,621,517
Participant contributions at end of year	2010-12-31	$804,816
Participant contributions at beginning of year	2010-12-31	$677,246
Participant contributions at beginning of year	2010-12-31	$0
Income. Received or receivable in cash from other sources (including rollovers)	2010-12-31	$10,272
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2010-12-31	$14,060
Administrative expenses (other) incurred	2010-12-31	$8
Liabilities. Value of operating payables at beginning of year	2010-12-31	$0
Total non interest bearing cash at end of year	2010-12-31	$110,727
Total non interest bearing cash at beginning of year	2010-12-31	$122,116
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2010-12-31	No
Value of net income/loss	2010-12-31	$-6,718,663
Value of net assets at end of year (total assets less liabilities)	2010-12-31	$43,178,911
Value of net assets at beginning of year (total assets less liabilities)	2010-12-31	$49,897,574
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2010-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2010-12-31	No
Were any leases to which the plan was party in default or uncollectible	2010-12-31	No
Value of interest in registered invesment companies (eg mutual funds) at end of year	2010-12-31	$12,940,630
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2010-12-31	$11,041,720
Interest on participant loans	2010-12-31	$31,589
Value of interest in common/collective trusts at end of year	2010-12-31	$19,047,445
Value of interest in common/collective trusts at beginning of year	2010-12-31	$18,855,485
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2010-12-31	$8,156,699
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2010-12-31	$9,485,193
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2010-12-31	$9,485,193
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2010-12-31	$835
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2010-12-31	$4,813,739
Net investment gain or loss from common/collective trusts	2010-12-31	$1,231,809
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2010-12-31	No
Was there a failure to transmit to the plan any participant contributions	2010-12-31	No
Has the plan failed to provide any benefit when due under the plan	2010-12-31	No
Assets. Invements in employer securities at end of year	2010-12-31	$2,104,804
Assets. Invements in employer securities at beginning of year	2010-12-31	$9,687,071
Contributions received in cash from employer	2010-12-31	$904,004
Employer contributions (assets) at end of year	2010-12-31	$13,790
Employer contributions (assets) at beginning of year	2010-12-31	$14,683
Income. Dividends from common stock	2010-12-31	$27,009
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2010-12-31	$5,114,182
Liabilities. Value of benefit claims payable at beginning of year	2010-12-31	$0
Did the plan have assets held for investment	2010-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2010-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2010-12-31	No
Aggregate proceeds on sale of assets	2010-12-31	$667,456
Aggregate carrying amount (costs) on sale of assets	2010-12-31	$4,062,570
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2010-12-31	No
Opinion of an independent qualified public accountant for this plan	2010-12-31	Unqualified
Accountancy firm name	2010-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2010-12-31	381357951

Form 5500 Responses for OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST

2022: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2022 form 5500 responses
2022-01-01	Type of plan entity	Single employer plan
2022-01-01	Plan funding arrangement – Trust	Yes
2022-01-01	Plan benefit arrangement - Trust	Yes
2021: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2021 form 5500 responses
2021-01-01	Type of plan entity	Single employer plan
2021-01-01	Submission has been amended	Yes
2021-01-01	Plan funding arrangement – Trust	Yes
2021-01-01	Plan benefit arrangement - Trust	Yes
2020: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2020 form 5500 responses
2020-01-01	Type of plan entity	Single employer plan
2020-01-01	Plan funding arrangement – Trust	Yes
2020-01-01	Plan benefit arrangement - Trust	Yes
2019: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2019 form 5500 responses
2019-01-01	Type of plan entity	Single employer plan
2019-01-01	Plan funding arrangement – Trust	Yes
2019-01-01	Plan benefit arrangement - Trust	Yes
2018: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2018 form 5500 responses
2018-01-01	Type of plan entity	Single employer plan
2018-01-01	Plan funding arrangement – Trust	Yes
2018-01-01	Plan benefit arrangement - Trust	Yes
2017: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2017 form 5500 responses
2017-01-01	Type of plan entity	Single employer plan
2017-01-01	Plan funding arrangement – Trust	Yes
2017-01-01	Plan benefit arrangement - Trust	Yes
2016: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2016 form 5500 responses
2016-01-01	Type of plan entity	Single employer plan
2016-01-01	Plan funding arrangement – Trust	Yes
2016-01-01	Plan benefit arrangement - Trust	Yes
2015: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2015 form 5500 responses
2015-01-01	Type of plan entity	Single employer plan
2015-01-01	Plan funding arrangement – Trust	Yes
2015-01-01	Plan benefit arrangement - Trust	Yes
2014: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2014 form 5500 responses
2014-01-01	Type of plan entity	Single employer plan
2014-01-01	Plan funding arrangement – Trust	Yes
2014-01-01	Plan benefit arrangement - Trust	Yes
2013: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2013 form 5500 responses
2013-01-01	Type of plan entity	Single employer plan
2013-01-01	Submission has been amended	Yes
2013-01-01	Plan funding arrangement – Trust	Yes
2013-01-01	Plan benefit arrangement - Trust	Yes
2012: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2012 form 5500 responses
2012-01-01	Type of plan entity	Single employer plan
2012-01-01	Plan funding arrangement – Trust	Yes
2012-01-01	Plan benefit arrangement - Trust	Yes
2011: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2011 form 5500 responses
2011-01-01	Type of plan entity	Single employer plan
2011-01-01	Plan funding arrangement – Trust	Yes
2011-01-01	Plan benefit arrangement - Trust	Yes
2009: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2009 form 5500 responses
2009-01-01	Type of plan entity	Single employer plan
2009-01-01	Submission has been amended	No
2009-01-01	This submission is the final filing	No
2009-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2009-01-01	Plan is a collectively bargained plan	No
2009-01-01	Plan funding arrangement – Trust	Yes
2009-01-01	Plan benefit arrangement - Trust	Yes
2008: OLD SECOND BANCORP, INC EMPLOYEES 401(K) SAVINGS PLAN & TRUST 2008 form 5500 responses
2008-01-01	Type of plan entity	Single employer plan
2008-01-01	Submission has been amended	Yes
2008-01-01	This submission is the final filing	No
2008-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2008-01-01	Plan is a collectively bargained plan	No
2008-01-01	Plan funding arrangement – Trust	Yes
2008-01-01	Plan benefit arrangement - Trust	Yes

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Company Name:	OLD SECOND BANCORP, INC
Employer identification number (EIN):	363143493
NAIC Classification:	522110
NAIC Description:	Commercial Banking