---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-048037"
form_type: "8-K"
ticker: "BY"
cik: "0001702750"
company_name: "BYLINE BANCORP, INC."
filed_at: "2025-04-01T23:59:59+00:00"
generated_at: "2026-05-24T00:51:15.162998+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Byline Bancorp completes $41.5M merger with First Security Bancorp, assets reach $9.8B

## Summary
- Merger closed April 1, 2025; First Security merged into Byline Bank, adding scale in Chicago metro.
- Total pro forma assets of approximately $9.8 billion as of December 31, 2024.
- Each First Security common share exchanged for 2.3539 shares of BY common stock.
- Total merger consideration valued at roughly $41.5 million; preferred shares redeemed for $2.4M cash.
- CEO Roberto Herencia highlighted strengthened community banking position in Chicago.

## SEC filing metadata
- accession: 0000950170-25-048037
- form_type: 8-K
- ticker: BY
- cik: 0001702750
- company_name: BYLINE BANCORP, INC.
- filed_at: 2025-04-01T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1702750/000095017025048037/0000950170-25-048037-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1702750/000095017025048037/by-20250401.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-048037
- JSON: https://secwatch.observer/filing/0000950170-25-048037.json
- Plain text: https://secwatch.observer/filing/0000950170-25-048037.txt

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