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| Company Name: | ALLIANT ENERGY CORPORATE SERVICES, INC. |
| Employer identification number (EIN): | 391914946 |
| NAIC Classification: | 221100 |
The following addresses have been detected on the 401k submissions:
| USA Mailing Address | ||||||
|---|---|---|---|---|---|---|
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| Date first seen: 2010-10-05 | ||||||
| Date last seen: 2025-12-03 | ||||||
| USA Mailing Address | |||||
|---|---|---|---|---|---|
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| Date first seen: 2025-07-30 | |||||
| Date last seen: 2025-12-03 | |||||
The following addresses have been found in other jurisdictions:
| Jurisdiction: | Washington Secretary of State Corporations Division | ||||
| Address: |
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| Jurisdiction Company ID: | 602364995 | ||||
| Jurisdiction Registration Date: | 2003-12-23 |
| Jurisdiction: | Washington Department of State | ||||
| Address: |
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| Jurisdiction Company ID: | 602364995 | ||||
| Jurisdiction Registration Date: | 2003-12-23 |
| Jurisdiction: | |||||
| Address: |
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| Jurisdiction Company ID: | |||||
| Jurisdiction Registration Date: |
| Date | Description |
|---|---|
| 2021-10-13 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERV. INC. to ALLIANT ENERGY CORPORATE SERVICES, INC. |
| 2021-10-11 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERVICES, INC. to ALLIANT ENERGY CORPORATE SERVICES |
| 2021-10-11 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERVICES to ALLIANT ENERGY CORPORATE SERV.INC. |
| 2021-10-11 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERV.INC. to ALLIANT ENERGY CORPORATE SERVICES |
| 2021-10-11 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERVICES to ALLIANT ENERGY CORPORATE SERV. INC. |
| 2021-10-09 | 391914946 Change of name detected from ALLIANT ENERGY CORPORATE SERV.INC. to ALLIANT ENERGY CORPORATE SERVICES, INC. |
| Plan id# | Plan Name | Plan Start Date | Plan Effective Date |
|---|---|---|---|
| 501 | ALLIANT ENERGY HEALTH & WELFARE BENEFIT PLAN | 2014-01-01 | 2005-01-01 |
| 001 | ALLIANT ENERGY CASH BALANCE PENSION PLAN | 2015-01-01 | 1940-04-01 |
| 100 | ALLIANT ENERGY CORPORATION MASTER RETIREMENT TRUST | 2015-01-01 | 2021-01-01 |
| 502 | ALLIANT ENERGY RETIREE HEALTH & WELFARE BENEFIT PLAN | 2015-01-01 | 2011-01-01 |
| 005 | ALLIANT ENERGY CORPORATION 401(K) SAVINGS PLAN | 2015-01-01 | 1983-01-01 |
| 008 | IES EMPLOYEE STOCK OWNERSHIP PLAN | 2011-01-01 | 1975-12-31 |
| Date | Type of contribution | Contribution | Number of participants/employees | Average contribution per participant | |
|---|---|---|---|---|---|
| 2020-07-17 | Employer Contributions | $ 2,073,000 | 3361 | $ 617 | |
| 2020-07-17 | Employee Contributions | $ 2,073,000 | 3361 | $ 617 | |
| 2020-01-15 | Employer Contributions | $ 1,670,975 | 3361 | $ 497 | |
| 2020-01-15 | Employee Contributions | $ 1,670,975 | 3361 | $ 497 | |
| 2019-10-15 | Employer Contributions | $ 455,541 | 3554 | $ 128 | |
| 2019-10-15 | Employee Contributions | $ 455,541 | 3554 | $ 128 | |
| 2014-11-24 | Employer Contributions | $ 1,400,000 | 3632 | $ 385 | |
| 2014-11-24 | Employee Contributions | $ 1,400,000 | 3632 | $ 385 | |
| 2014-10-30 | Employer Contributions | $ 34,572 | 3632 | $ 10 | |
| 2014-10-30 | Employee Contributions | $ 34,572 | 3632 | $ 10 | |
| 2011-12-29 | Employer Contributions | $ 10,000,000 | 1106 | $ 9,042 | |
| 2011-12-29 | Employee Contributions | $ 10,000,000 | 1106 | $ 9,042 | |
| 2011-12-01 | Employer Contributions | $ 1,325,000 | 1106 | $ 1,198 | |
| 2011-12-01 | Employee Contributions | $ 1,325,000 | 1106 | $ 1,198 | |
| 2011-08-01 | Employer Contributions | $ 8,900,000 | 1106 | $ 8,047 | |
| 2011-08-01 | Employee Contributions | $ 8,900,000 | 1106 | $ 8,047 | |
| 2009-12-22 | Employer Contributions | $ 20,000,000 | 4296 | $ 4,655 | |
| 2009-12-22 | Employee Contributions | $ 20,000,000 | 4296 | $ 4,655 | |
| 2009-04-01 | Employer Contributions | $ 1,079,450 | 4296 | $ 251 | |
| 2009-04-01 | Employee Contributions | $ 1,079,450 | 4296 | $ 251 |
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