---
schema_version: "secwatch.filing_event.v1"
accession: "0000357173-25-000066"
form_type: "8-K"
ticker: "OSBC"
cik: "0000357173"
company_name: "OLD SECOND BANCORP INC"
filed_at: "2025-07-01T23:59:59+00:00"
generated_at: "2026-05-18T11:03:48.587544+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Old Second completes merger with Bancorp Financial; pro forma assets ~$6.98B

## Summary
- Bancorp Financial shareholders receive 2.5814 OSBC shares + $15.93 cash per share; merger closed July 1, 2025.
- Pro forma combined: ~$6.98B assets, $5.95B deposits, $5.09B loans, 56 locations in Chicago market.
- Darin Campbell (former Bancorp Financial CEO) joins OSBC board; appointed EVP, President of three lending units; $550k base salary.
- Jill Voss (former Bancorp Financial CFO) joins Old Second National Bank board.
- Campbell receives CBAA with 2x severance on change-in-control termination, plus other benefits.

## SEC filing metadata
- accession: 0000357173-25-000066
- form_type: 8-K
- ticker: OSBC
- cik: 0000357173
- company_name: OLD SECOND BANCORP INC
- filed_at: 2025-07-01T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.01, 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/357173/000035717325000066/0000357173-25-000066-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/357173/000035717325000066/tmb-20250701x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000357173-25-000066
- JSON: https://secwatch.observer/filing/0000357173-25-000066.json
- Plain text: https://secwatch.observer/filing/0000357173-25-000066.txt

## Key facts
- M&A Transactions
  OLD SECOND BANCORP INC completed an acquisition involving Bancorp Financial, Inc. for 2.5814 shares of Old Second common stock and $15.93 in cash per share of Bancorp Financial common stock (closed 2025-07-01).
  - Action: acquisition
  - Counterparty: Bancorp Financial, Inc.
  - Consideration: 2.5814 shares of Old Second common stock and $15.93 in cash per share of Bancorp Financial common stock
  - Closing: 2025-07-01
  source text: to the terms of the Merger Agreement, at the Effective Time, each Bancorp Financial stockholder became entitled to receive, for each share of Bancorp Financial common stock held, 2.5814 shares of Old Second common stock and $15.93 in cash, without interest, with cash paid in lieu of any fractional shares. Each outstanding share of Old Second’s common stock
  evidence_url: https://www.sec.gov/Archives/edgar/data/357173/000035717325000066/0000357173-25-000066-index.htm

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