Byline Bancorp (NYSE: BY) director adds 300 common shares

Rhea-AI Filing Summary

Byline Bancorp, Inc. director Mary Jo S. Herseth reported an open-market purchase of common stock through an indirect account. On March 16, 2026, an entity described as The Herseth Family Revocable Trust Dated 12/02/25 bought 300 shares at $30.8297 per share. Following this transaction, the trust’s reported indirect holdings in Byline Bancorp common stock increased to 18,800 shares.

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

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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^*

HERSETH MARY JO S.

(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)
03/16/2026

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	03/16/2026		P		300	A	$30.8297	18,800	I	The Herseth Family Revocable Trust Dated 12/02/25

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	03/16/2026
	** 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 BY director Mary Jo S. Herseth report?

Director Mary Jo S. Herseth reported an open-market purchase of Byline Bancorp common stock. Through an indirect account, a family trust acquired 300 shares, increasing its reported indirect holdings to 18,800 shares of BY common stock.

How many BY shares were bought in the latest Form 4 filing?

The Form 4 shows a purchase of 300 shares of Byline Bancorp common stock. This open-market transaction increased the reporting trust’s total indirect position to 18,800 shares, as disclosed after the transaction was completed.

What price did the BY insider pay per share in this transaction?

The reported open-market purchase was executed at an average price of $30.8297 per share. This price applies to the 300 common shares acquired indirectly on March 16, 2026, by the Herseth family trust.

How many BY shares does the Herseth-related trust hold after the trade?

After the transaction, The Herseth Family Revocable Trust Dated 12/02/25 is reported to hold 18,800 shares of Byline Bancorp common stock indirectly. This figure reflects the position following the purchase of 300 additional shares.

Is the BY insider transaction held directly or through an entity?

The reported BY shares are held indirectly through The Herseth Family Revocable Trust Dated 12/02/25. The Form 4 classifies the ownership type as indirect, meaning the shares are owned via this family trust rather than directly.

What does the Form 4 indicate about BY insider trading direction?

The Form 4 indicates a net-buy direction for BY shares. It records one open-market purchase totaling 300 shares and no reported sales, gifts, or derivative exercises in this particular filing.