EntityWire/Wisconsin business entity search →/INTERSTATE POWER AND LIGHT COMPANY
Employer with a benefit plan
INTERSTATE POWER AND LIGHT COMPANY
INTERSTATE POWER AND LIGHT COMPANY's Employer Identification Number (EIN) is 42-0331370.
At a glance
- EIN
- 42-0331370 · 420331370
- Legal name
- INTERSTATE POWER AND LIGHT COMPANY
- Also filed as
- IES UTILITIES INC
- Address on file
- 4902 N BILTMORE LANE, MADISON, WI 537182148
- Records show
- SEC filer; employer with a benefit plan
- Latest record
- 2026-08-21
SEC records
SEC EDGAR company filings · records as of 2026-08-21
- SEC CIK
- 0000052485
- Source: SEC · as of 2026-08-21
- Industry (SIC)
- Electric & Other Services Combined (4931)
- Source: SEC · as of 2026-08-21
- State of incorporation
- IA
- Source: SEC · as of 2026-08-21
- Latest SEC filing
- 8-K 2026-08-21
- Source: SEC · as of 2026-08-21
Benefit plans
DOL Form 5500 filings (EFAST2) · records as of 2025-10-14
- Benefit plan 1, 2024 filing
- IPL RETIREMENT PLAN FOR BARGAINING UNIT EES
- Source: DOL 5500 · as of 2025-10-14
- Participants (start of year)
- 1,501
- Source: DOL 5500 · as of 2025-10-14
- Plan features
- Defined benefit (cash balance); Plan sponsor is a member of an affiliated service group
- Source: DOL 5500 · as of 2025-10-14
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-10-14
- Business code (NAICS)
- 221100
- Source: DOL 5500 · as of 2025-10-14
- Benefit plan 1, 2023 filing
- IPL RETIREMENT PLAN FOR BARGAINING UNIT EES
- Source: DOL 5500 · as of 2024-10-15
- Participants (start of year)
- 1,656
- Source: DOL 5500 · as of 2024-10-15
- Plan features
- Defined benefit (cash balance); Plan sponsor is a member of an affiliated service group
- Source: DOL 5500 · as of 2024-10-15
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2024-10-15
- Business code (NAICS)
- 221100
- Source: DOL 5500 · as of 2024-10-15
What this record is
Public filings that carry this EIN (DOL Form 5500 filings (EFAST2) and SEC EDGAR company filings), shown as filed. Nothing is scraped from the IRS, and a public-record match is not IRS TIN validation.
What it is not
Registry status, formation date, and registered agent come from the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services (Corporation Bureau); see the Wisconsin business entity search.
If something is wrong
A name, address, or classification here is what the source published. To correct the source, file with it; to have this page removed, see corrections and removal.
Other Wisconsin businesses on file
- BRADY CORPORATIONEIN 39-0178960
- MGIC INVESTMENT CORPORATIONEIN 39-1486475
- WISCONSIN POWER & LIGHT COMPANYEIN 39-0714890
- JOHNSON OUTDOORS INC.EIN 39-1536083
- WISCONSIN PUBLIC SERVICE CORPORATION (WPSC)EIN 39-0715160
- MADISON GAS AND ELECTRIC COMPANYEIN 39-0444025
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