401(k) · DOL Form 5500 · 2022
Alliant Energy Corporate Services, Inc. 401(k) Plan
Data updated 2026-08-06
- $1.2B
- Total assets
- 3,263
- Participants
- 99th
- Percentile by assets
- $357,352
- Avg per participant
Official DOL plan name: Alliant Energy Corporation 401(k) Savings Plan · Sponsored by Alliant Energy Corporate Services, Inc. · Wisconsin · Utilities
$1.2B in assets, 3,263 participants
Alliant Energy Corporate Services, Inc.'s Alliant Energy Corporation 401(k) Savings Plan reported $1.2B in total assets and 3,263 participants in its 2022 DOL Form 5500 filing, ranking in the 99th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.
- 99th percentile by assets (of 139,258 plans)
- #671 in Utilities (739 peers)
Coverage in Wisconsin
Alliant Energy Corporation 401(k) Savings Plan covers 3,263 participants in Wisconsin, 5.8x the typical Wisconsin plan (state average ~565 per filing). Assets: $1.2B.
- $1.2B
- total plan assets (2022 EOY)
- 3,263
- covered participants
- 99th
- percentile by assets (of 139,258 plans)
- $357,352
- avg assets per participant
The plan reported a net loss of $347M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Participants vs Wisconsin filers
In Wisconsin, the average filing covers about 565 participants across 2,767 plans. Alliant Energy Corporation 401(k) Savings Plan reports 3,263 participants - 5.8x that state average ($1.2B EOY assets).
Wisconsin filing particulars
| Total Assets (Beginning of Year) | $1.5B |
|---|---|
| Net Assets (End of Year) | $1.2B |
| Net Income | -$347M |
| Employer EIN | 391914946 |
| Plan Effective Date | 1983-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Alliant Energy Corporate Services, Inc.)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 2 | 3,712 | $1.4B |
| 2023 | 2 | 3,484 | $1.6B |
| 2024 | 2 | 3,621 | $1.6B |
Nearby 401(k) Plans in Wisconsin
Peer 401(k) plans, same state, same plan type, ranked by total assets.
Alliant Energy Corporation 401(k) Savings Plan vs. nearby 401(k) plans in Wisconsin, assets vs. participants
- Johnson Controls Retirement Savings and Investment Plan $5.5B · 28,701
- Fiserv 401(k) Savings Plan $4.3B · 26,610
- Kimberly-Clark Corporation 401(k) & Profit Sharing Plan $4.0B · 11,034
- Rockwell Automation Retirement Savings Plan $3.2B · 8,032
- Nm Employee Savings Plan $2.4B · 7,423
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Alliant Energy Corporation 401(k) Savings Plan by total assets, not by location.
- Blue Shield of California Tax Deferred Salary Investment Plan (CA) $1.2B · 8,169
- UPS/Ipa 401 (K) Savings Plan (KY) $1.2B · 2,992
- Varian Medical Systems, Inc. Retirement Plan (CA) $1.2B · 3,468
- Commercial Metals Companies Retirement Plan (TX) $1.2B · 7,424
Frequently Asked Questions
How did Alliant Energy Corporation 401(k) Savings Plan assets move in 2022? ▼
How have Alliant Energy Corporate Services, Inc. plan assets changed over time? ▼
Where does Alliant Energy Corporation 401(k) Savings Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Alliant Energy Corporation 401(k) Savings Plan? ▼
Next read for Alliant Energy Corporation 401(k) Saving…
Filing takeaways
Ways to act on Alliant Energy Corporation 401(k) Savings Plan's numbers.
- By total assets, Alliant Energy Corporation 401(k) Savings Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in Wisconsin. Compare plans
- Alliant Energy Corporate Services, Inc.'s sponsor-wide assets have grown 17.0% since 2022 across 3 plan years on file. More Utilities plans