---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-110474"
form_type: "8-K"
ticker: "BY"
cik: "0001702750"
company_name: "BYLINE BANCORP, INC."
filed_at: "2024-10-01T23:59:59+00:00"
generated_at: "2026-05-30T23:30:40.697709+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Byline Bancorp to acquire First Security Bancorp for ~$41M in cash and stock

## Summary
- Deal valued at ~$41M; Byline issues 2.1794 shares per First Security share (~1.5M shares) plus ~$2.6M cash for preferred.
- First Security has $354.8M in assets, $201.4M in loans, $321.8M in deposits as of June 30, 2024.
- Merger expected to close in Q2 2025, subject to regulatory and stockholder approvals.
- Transaction solidifies Byline as Chicago's largest community bank under $10B assets, with 45 branches.
- Boards of both companies unanimously approved the deal.

## SEC filing metadata
- accession: 0000950170-24-110474
- form_type: 8-K
- ticker: BY
- cik: 0001702750
- company_name: BYLINE BANCORP, INC.
- filed_at: 2024-10-01T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1702750/000095017024110474/0000950170-24-110474-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1702750/000095017024110474/by-20240930.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-110474
- JSON: https://secwatch.observer/filing/0000950170-24-110474.json
- Plain text: https://secwatch.observer/filing/0000950170-24-110474.txt

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