Byline Bancorp (BY) director buys 65 shares at $27.5575

Byline Bancorp (BY) director filed a Form 4 showing an open‑market purchase (code P) of 65 shares on 10/28/2025 at $27.5575 per share.

Rhea-AI Filing Summary

Byline Bancorp (BY) director filed a Form 4 showing an open‑market purchase (code P) of 65 shares on 10/28/2025 at $27.5575 per share.

After the transaction, beneficial ownership is 14,089 shares held indirectly via the William G. Kistner Trust dated June 22, 1973, and 1,036 shares held directly.

Insider Trade Summary

Net Buyer: 65 shares

Net Buy 2 txns

Insider KISTNER WILLIAM G

Role Director

Bought 65 shs ($2K)

Type	Security	Shares	Price	Value
Purchase	Common stock	65	$27.5575	$2K
holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 14,089 shares (Indirect, William G. Kistner Trust Date June 22, 1973); Common stock — 1,036 shares (Direct)

FAQ

What did BY’s director report on Form 4?

A purchase of 65 shares of common stock on 10/28/2025 at $27.5575 per share (transaction code P).

What is the director’s ownership after the trade?

Beneficial ownership totals 14,089 shares indirectly and 1,036 shares directly.

How are the indirect shares held for BY (BY)?

Indirectly through the William G. Kistner Trust dated June 22, 1973.

Was this a purchase or sale?

It was a purchase (code P) of common stock.

What is the price paid per share?

The reported price was $27.5575 per share.

What is the reporting person’s relationship to BY?

The reporting person is a Director of Byline Bancorp, Inc.

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Accepted by SEC EDGAR 10/28/2025 - 05:15 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KISTNER WILLIAM G

(Last) (First) (Middle)

180 NORTH LASALLE STREET

SUITE 300

(Street)

CHICAGO IL 60601

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
BYLINE BANCORP, INC. [ BY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/28/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common stock	10/28/2025		P		65	A	$27.5575	14,089	I	William G. Kistner Trust Date June 22, 1973
Common stock								1,036	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Thomas J. Bell III, Attorney-in-Fact	10/28/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.