---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-063201"
form_type: "8-K"
ticker: "FBIZ"
cik: "0001521951"
company_name: "FIRST BUSINESS FINANCIAL SERVICES, INC."
filed_at: "2025-05-05T23:59:59+00:00"
generated_at: "2026-05-22T17:12:35.217861+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# First Business CEO Corey Chambas to retire May 2, 2026; COO Dave Seiler named successor

## Summary
- Corey Chambas to retire as CEO effective May 2, 2026; will remain on boards.
- David R. Seiler, currently President and COO, appointed CEO effective same date.
- Chambas has been CEO since Jan 2006; joined company in 1993.
- Seiler joined in Apr 2016; previously MD at BMO Harris Bank.
- Board Chairman Jerry Kilcoyne praises Chambas' leadership and transition plan.

## SEC filing metadata
- accession: 0000950170-25-063201
- form_type: 8-K
- ticker: FBIZ
- cik: 0001521951
- company_name: FIRST BUSINESS FINANCIAL SERVICES, INC.
- filed_at: 2025-05-05T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1521951/000095017025063201/0000950170-25-063201-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1521951/000095017025063201/fbiz-20250502.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-063201
- JSON: https://secwatch.observer/filing/0000950170-25-063201.json
- Plain text: https://secwatch.observer/filing/0000950170-25-063201.txt

## Key facts
- Executive change
  Corey Chambas retired as Chief Executive Officer at FIRST BUSINESS FINANCIAL SERVICES, INC..
  - Action: retired
  - Role: Chief Executive Officer
  source text: On May 2, 2025, Corey Chambas, Chief Executive Officer of First Business Financial Services, Inc. (the “Company”), notified the Company of his intention to retire from his role effective May 2, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1521951/000095017025063201/0000950170-25-063201-index.htm

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