Alliant Energy Corporate Services, INC.
Madison, WI, 537182148
- Plans
- 5
- Total participants
- 32,679
- Filing years
- 2024, 2023, 2022, 2021, 2020
- NAICS
- 221100
Benefit plans on file
| Year | Form | Plan # | Plan name | Participants |
|---|---|---|---|---|
| 2024 | Form 5500 | 001 | Alliant Energy Cash Balance Pension Plan | 273 |
| 2024 | Form 5500 | 005 | Alliant Energy Corporation 401(K) Savings Plan | 2,987 |
| 2024 | Form 5500 | 100 | Alliant Energy Corporation Master Retirement Trust | — |
| 2024 | Form 5500 | 501 | Alliant Energy Health & Welfare Benefit Plan | 3,085 |
| 2024 | Form 5500 | 502 | Alliant Energy Retiree Health & Welfare Benefit Plan | — |
| 2023 | Form 5500 | 001 | Alliant Energy Cash Balance Pension Plan | 356 |
| 2023 | Form 5500 | 005 | Alliant Energy Corporation 401(K) Savings Plan | 3,265 |
| 2023 | Form 5500 | 100 | Alliant Energy Corporation Master Retirement Trust | — |
| 2023 | Form 5500 | 501 | Alliant Energy Health & Welfare Benefit Plan | 3,241 |
| 2023 | Form 5500 | 502 | Alliant Energy Retiree Health & Welfare Benefit Plan | — |
| 2022 | Form 5500 | 001 | Alliant Energy Cash Balance Pension Plan | 383 |
| 2022 | Form 5500 | 005 | Alliant Energy Corporation 401(K) Savings Plan | 3,101 |
| 2022 | Form 5500 | 100 | Alliant Energy Corporation Master Retirement Trust | — |
| 2022 | Form 5500 | 501 | Alliant Energy Health & Welfare Benefit Plan | 2,757 |
| 2022 | Form 5500 | 502 | Alliant Energy Retiree Health & Welfare Benefit Plan | — |
| 2021 | Form 5500 | 001 | Alliant Energy Cash Balance Pension Plan | 449 |
| 2021 | Form 5500 | 005 | Alliant Energy Corporation 401(K) Savings Plan | 3,263 |
| 2021 | Form 5500 | 100 | Alliant Energy Corporation Master Retirement Trust | — |
| 2021 | Form 5500 | 501 | Alliant Energy Health & Welfare Benefit Plan | 2,892 |
| 2021 | Form 5500 | 502 | Alliant Energy Retiree Health & Welfare Benefit Plan | — |
| 2020 | Form 5500 | 001 | Alliant Energy Cash Balance Pension Plan | 515 |
| 2020 | Form 5500 | 005 | Alliant Energy Corporation 401(K) Savings Plan | 3,361 |
| 2020 | Form 5500 | 100 | Alliant Energy Corporation Master Retirement Trust | — |
| 2020 | Form 5500 | 501 | Alliant Energy Health & Welfare Benefit Plan | 2,751 |
| 2020 | Form 5500 | 502 | Alliant Energy Retiree Health & Welfare Benefit Plan | — |
Data shown as filed with the U.S. Department of Labor (EBSA), filing years 2020–2025; not validated by OpenERISA. View official filings for this EIN on the DOL EFAST2 search.
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