Brogan Ptacin - 28 Aug 2025 Form 4 Insider Report for BYLINE BANCORP, INC. (BY)

Role: HEAD OF COMMERCIAL BANKING
Signature: /s/ Thomas J. Bell III, Attorney-in-Fact
Issuer symbol: BY
Transactions as of: 28 Aug 2025
Net transactions value: -$206,119
Form type: 4
Filing time: 29 Aug 2025, 10:15:58 UTC
Previous filing: 26 Feb 2025
Next filing: 24 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Ptacin Brogan	HEAD OF COMMERCIAL BANKING	180 N. LASALLE ST., SUITE 300, CHICAGO	/s/ Thomas J. Bell III, Attorney-in-Fact	29 Aug 2025	0001368185

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BY	Common stock	Options Exercise	$137,610	+11,812	+54%	$11.65	33,586	28 Aug 2025	Direct
transaction	BY	Common stock	Sale	$343,729	-11,812	-35%	$29.10	21,774	28 Aug 2025	Direct
holding	BY	Common stock						27,200	28 Aug 2025	By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	BY	Stock Option	Options Exercise	$0	-11,812	-56%	$0.000000	9,450	28 Aug 2025	Common stock	11,812	$11.65	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.