EntityWire/Illinois business entity search →/OLD SECOND BANCORP, INC.
Employer with a benefit plan
OLD SECOND BANCORP, INC.
The Employer Identification Number (EIN) for OLD SECOND BANCORP, INC. is 36-3143493.
At a glance
- EIN
- 36-3143493 · 363143493
- Legal name
- OLD SECOND BANCORP, INC.
- Address on file
- 37 S. RIVER ST., AURORA, IL 60506
- Records show
- SEC filer; employer with a benefit plan
- Latest record
- 2026-09-03
SEC records
SEC EDGAR company filings · records as of 2026-09-03
- SEC CIK
- 0000357173
- Source: SEC · as of 2026-09-03
- Industry (SIC)
- State Commercial Banks (6022)
- Source: SEC · as of 2026-09-03
- State of incorporation
- DE
- Source: SEC · as of 2026-09-03
- Ticker
- OSBC
- Source: SEC · as of 2026-09-03
- Latest SEC filing
- 4 2026-09-03
- Source: SEC · as of 2026-09-03
Benefit plans
DOL Form 5500 filings (EFAST2) · records as of 2025-07-18
- Benefit plan 3, 2024 filing
- OLD SECOND BANCORP, INC. EMPLOYEES' 401(K) SAVINGS PLAN & TRUST
- Source: DOL 5500 · as of 2025-07-18
- Participants (start of year)
- 999
- Source: DOL 5500 · as of 2025-07-18
- Plan features
- Profit-sharing; ERISA 404(c) plan; Participant-directed; 401(k) feature; 401(m) matching; Automatic enrollment
- Source: DOL 5500 · as of 2025-07-18
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-07-18
- Business code (NAICS)
- 522110
- Source: DOL 5500 · as of 2025-07-18
- Benefit plan 3, 2023 filing
- OLD SECOND BANCORP, INC. EMPLOYEES' 401(K) SAVINGS PLAN & TRUST
- Source: DOL 5500 · as of 2024-07-19
- Participants (start of year)
- 1,031
- Source: DOL 5500 · as of 2024-07-19
- Plan features
- Profit-sharing; ERISA 404(c) plan; Participant-directed; 401(k) feature; 401(m) matching; Automatic enrollment
- Source: DOL 5500 · as of 2024-07-19
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2024-07-19
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 Illinois Secretary of State, Department of Business Services; see the Illinois 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 Illinois businesses on file
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- SERVBANKEIN 36-4482786
- QCR HOLDINGS INCEIN 42-1397595
- HBT FINANCIAL, INC.EIN 37-1117216
- POWER SOLUTIONS INTERNATIONAL, INC.EIN 33-0963637
- ACTS AVIATION SECURITY, INC.EIN 62-1870344
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