Byline Bancorp (BY) director adds BY shares through family trust purchase

Rhea-AI Filing Summary

Byline Bancorp director William G. Kistner reported a small open-market share purchase. On August 8, 2025, an entity identified as the William G. Kistner Trust Date June 22, 1973 bought 60 shares of Byline Bancorp common stock at $25.705 per share.

After this transaction, the trust held 14,024 shares of Byline Bancorp common stock as indirect beneficial ownership. Separately, Kistner also reported 1,036 shares of common stock held as direct ownership.

Insider Trade Summary

Net Buyer: 60 shares ($1,542)

Net Buy 2 txns

Insider KISTNER WILLIAM G

Role Director

Bought 60 shs ($2K)

Type	Security	Shares	Price	Value
Purchase	Common stock	60	$25.705	$2K
holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 14,024 shares (Indirect, William G. Kistner Trust Date June 22, 1973); Common stock — 1,036 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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)
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.
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.

FAQ

What insider transaction did Byline Bancorp (BY) report for William G. Kistner?

Byline Bancorp director William G. Kistner reported an open-market purchase of 60 shares of common stock. The shares were acquired on August 8, 2025 at a price of $25.705 per share through the William G. Kistner Trust.

At what price were the Byline Bancorp (BY) shares purchased in this Form 4 filing?

The reported purchase price was $25.705 per share for Byline Bancorp common stock. This price applied to 60 shares acquired on August 8, 2025 by the William G. Kistner Trust, as disclosed in the Form 4 insider trading report.

How many Byline Bancorp (BY) shares does the Kistner trust hold after the transaction?

Following the reported transaction, the William G. Kistner Trust beneficially owned 14,024 shares of Byline Bancorp common stock. This amount reflects indirect ownership attributed to William G. Kistner through the trust structure disclosed in the filing.

What is William G. Kistner’s direct share ownership in Byline Bancorp (BY)?

In addition to indirect holdings through a trust, William G. Kistner reported direct ownership of 1,036 Byline Bancorp common shares. These directly held shares are separate from the 14,024 shares held indirectly by the William G. Kistner Trust.

What is the role of William G. Kistner at Byline Bancorp (BY)?

William G. Kistner is identified as a director of Byline Bancorp. The Form 4 indicates his relationship to the issuer under the director category, reflecting board-level involvement rather than an executive officer position at the company.

Was the Byline Bancorp (BY) insider transaction direct or through a trust?

The 60-share purchase reported on August 8, 2025 was executed through the William G. Kistner Trust Date June 22, 1973. The filing classifies this as indirect beneficial ownership for director William G. Kistner rather than a directly held position.