OLD SECOND BANCORP INC
State Commercial Banks
SEC reporting entityCIK 0000357173OSBC
Source: SEC EDGAR submissions · Retrieved Oct 13, 2026 · Report a correction or privacy concern
Company identity
- Legal name
- OLD SECOND BANCORP INC
- Incorporation jurisdiction
- Delaware
- Business address locality
- AURORA, IL
- Industry classification
- 6022 — State Commercial Banks
- Exchange(s)
- Nasdaq
- State registration status
- Not verified from the state registry
Published identifiers
- SEC Central Index Key (CIK)
- 0000357173
- Federal EIN, as reported to the SEC
- 36-3143493
- State registration number
- Not collected — consult the official registry
- Legal Entity Identifier (LEI)
- Not collected
An EIN displayed here is not an IRS validation. Learn what each identifier means.
Recent public filings
- 8-KOct 1, 2026View on SEC
- 10-QAug 6, 2026View on SEC
- 8-KJul 22, 2026View on SEC
- 8-KJul 21, 2026View on SEC
- 8-KJul 8, 2026View on SEC
Financial statements may be included in these filings. This profile does not calculate revenue, profit or a credit score.
Source and limitations
Collected from SEC EDGAR submissions on Oct 13, 2026. SEC registration and filing activity do not certify that a business is in good standing, solvent or licensed for a particular activity.
Our collection is selective. For current legal registration status, use the Delaware official authority. No directors’ personal profiles, home street addresses or consumer credit assessments are provided.