EntityWire/Indiana business entity search →/MIDCONTINENT INDEPENDENT SYSTEM OPERATOR INC
Tax-exempt organization
MIDCONTINENT INDEPENDENT SYSTEM OPERATOR INC
MIDCONTINENT INDEPENDENT SYSTEM OPERATOR INC's Employer Identification Number (EIN) is 43-1827033.
At a glance
- EIN
- 43-1827033 · 431827033
- Legal name
- MIDCONTINENT INDEPENDENT SYSTEM OPERATOR INC
- Also filed as
- MISO
- Address on file
- 720 CITY CENTER DR, CARMEL, IN 46032-3826
- Records show
- Tax-exempt organization; employer with a benefit plan
- Latest record
- 2026-09
Benefit plans
DOL Form 5500 filings (EFAST2) · records as of 2025-08-28
- Benefit plan 1, 2024 filing
- MISO EMPLOYEES' RETIREMENT SAVINGS PLAN
- Source: DOL 5500 · as of 2025-08-28
- Participants (start of year)
- 1,384
- Source: DOL 5500 · as of 2025-08-28
- Plan features
- Profit-sharing; ERISA 404(c) plan; Participant-directed; 401(k) feature; 401(m) matching; Pension plan with defined contribution
- Source: DOL 5500 · as of 2025-08-28
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-08-28
- Business code (NAICS)
- 221100
- Source: DOL 5500 · as of 2025-08-28
- Benefit plan 510, 2024 filing
- MIDCONTINENT INDEPENDENT SYSTEMS OPERATOR, INC. EMPLOYEE BENEFIT PLAN
- Source: DOL 5500 · as of 2025-07-29
- Participants (start of year)
- 1,070
- Source: DOL 5500 · as of 2025-07-29
IRS exempt organization record
IRS Exempt Organizations Business Master File · records as of 2026-09
- Tax-exempt status
- 501(c)(4) social welfare
- Source: IRS · as of 2026-09
- Deductibility
- Contributions are not deductible
- Source: IRS · as of 2026-09
- IRS ruling date
- 2001-01
- Source: IRS · as of 2026-09
- NTEE code
- W80
- Source: IRS · as of 2026-09
- Latest tax period on file
- 2024-12
- Source: IRS · as of 2026-09
- Revenue (latest 990)
- $616,078,935
- Source: IRS · as of 2026-09
- Assets (latest 990)
- $3,354,403,000
- Source: IRS · as of 2026-09
What this record is
Public filings that carry this EIN (DOL Form 5500 filings (EFAST2), DOL Form 5500-SF filings (EFAST2) and IRS Exempt Organizations Business Master File), 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 Indiana Secretary of State, Business Services Division; see the Indiana 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.
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