---
schema_version: "secwatch.filing_event.v1"
accession: "0000357173-26-000014"
form_type: "8-K"
ticker: "OSBC"
cik: "0000357173"
company_name: "OLD SECOND BANCORP INC"
filed_at: "2026-03-04T23:59:59+00:00"
generated_at: "2026-05-15T21:54:35.557804+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Old Second Bancorp redeems $30M of 3.50% subordinated notes due 2031

## Summary
- Redemption of $30M aggregate principal of 3.50% Fixed-to-Floating Rate Subordinated Notes due 2031.
- Redemption date is April 15, 2026; redemption price is 100% of principal plus accrued interest.
- After redemption, $30M aggregate principal of the notes will remain outstanding.
- Federal Reserve Bank of Chicago provided non-objection to the redemption.

## SEC filing metadata
- accession: 0000357173-26-000014
- form_type: 8-K
- ticker: OSBC
- cik: 0000357173
- company_name: OLD SECOND BANCORP INC
- filed_at: 2026-03-04T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/357173/000035717326000014/0000357173-26-000014-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/357173/000035717326000014/osbc-20260304x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000357173-26-000014
- JSON: https://secwatch.observer/filing/0000357173-26-000014.json
- Plain text: https://secwatch.observer/filing/0000357173-26-000014.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.