[Form 4] Byline Bancorp, Inc. Insider Trading Activity

Rhea-AI Filing Summary

William G. Kistner, a director of Byline Bancorp (BY), reported changes in his common stock holdings. The Form 4 records a disposition of 1,036 shares and an apparent acquisition of 60 shares at $25.705 on 08/08/2025. Following the reported transactions he beneficially owns 14,024 shares indirectly through the William G. Kistner Trust dated June 22, 1973.

Positive

• Continued indirect ownership: Reporting person retains 14,024 shares via the William G. Kistner Trust.
• Small purchase reported: Acquisition of 60 shares at $25.705 is disclosed.

Negative

• Insider disposition: Reported sale/disposition of 1,036 shares on the transaction date.

Insights

Financial Analyst

TL;DR: Small insider sale alongside a minor buy; director retains substantial indirect trust holdings.

The filing documents a single trading date with a 1,036-share disposition and a 60-share acquisition at $25.705. For an investor assessing materiality, the transaction size is modest relative to typical market-cap measures and does not, on its face, indicate a material change in insider ownership. The key datapoint is the 14,024 shares held indirectly via the named trust, which represents the ongoing aligned ownership interest disclosed in this Form 4.

Corporate Governance Expert

TL;DR: Routine Form 4 reporting of director transactions; disclosure shows continued trust ownership.

The report names William G. Kistner as a director and specifies transactions in common stock on 08/08/2025. The combination of a disposition (1,036 shares) and a small acquisition (60 shares at $25.705) is consistent with routine portfolio activity or rebalancing. The filing also documents 14,024 shares held indirectly through the William G. Kistner Trust (dated June 22, 1973), which is the primary disclosed beneficial holding in this submission.

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
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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)
08/08/2025

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	08/08/2025		P		60	A	$25.705	14,024	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	08/11/2025
	** 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.
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