Byline Bancorp (BY) director buys 300 shares in trust stake

Rhea-AI Filing Summary

BYLINE BANCORP, INC. (BY) director Mary Jo S. Herseth reported an open-market purchase of 300 shares of common stock on 2026-08-19 at $38.395 per share. The shares are held indirectly through The Herseth Family Revocable Trust Dated 12/02/25, bringing the trust’s reported holdings to 19,100 shares. The Rule 10b5-1 trading-plan checkbox was not selected.

Insider Trade Summary

Net Buyer: 300 shares

Net Buy 1 txn

Insider HERSETH MARY JO S.

Role Director

Bought 300 shs ($12K)

Type	Security	Shares	Price	Value
Purchase	Common stock	300	$38.395	$12K

Holdings After Transaction: Common stock — 19,100 shares (Indirect, The Herseth Family Revocable Trust Dated 12/02/25)

Key Figures

Shares purchased: 300 shares Purchase price per share: $38.395 per share Shares owned after transaction: 19,100 shares +1 more

4 metrics

Shares purchased 300 shares Common stock acquired on 2026-08-19 in an open-market or private transaction

Purchase price per share $38.395 per share Price for the 300 BY common shares purchased on 2026-08-19

Shares owned after transaction 19,100 shares Indirect holdings of The Herseth Family Revocable Trust after the reported purchase

Net buy shares 300 shares Net change across all reported transactions in this Form 4

Key Terms

indirect, Purchase in open market or private transaction, Rule 10b5-1

3 terms

indirect financial

"ownership_type": "indirect"

Purchase in open market or private transaction financial

"transaction_code_description": "Purchase in open market or private transaction"

Rule 10b5-1 regulatory

"aff_10b5_one is the filing's document-level Rule 10b5-1 checkbox"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transaction did BY (BYLINE BANCORP, INC.) disclose for Mary Jo S. Herseth?

Mary Jo S. Herseth reported buying 300 shares of BYLINE BANCORP, INC. common stock. The purchase occurred on 2026-08-19 and was classified as a purchase in open market or private transaction at a reported price of $38.395 per share.

At what price were the new BY shares purchased in the latest Form 4 filing?

The reported purchase price was $38.395 per share for BY common stock. This price applies to the 300 shares acquired in the transaction dated 2026-08-19, which was coded as a purchase in open market or private transaction.

How many BY shares does the Herseth Family Revocable Trust hold after this transaction?

Following the reported purchase, The Herseth Family Revocable Trust holds 19,100 BY shares. These shares are reported as indirectly owned by director Mary Jo S. Herseth, reflecting the total position after adding the 300 newly acquired shares.

Was the recent BY insider purchase by Mary Jo S. Herseth under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox was not selected. This means the reported 300-share purchase at $38.395 per share on 2026-08-19 was not affirmed as being executed under a pre-arranged Rule 10b5-1 trading plan.

Is Mary Jo S. Herseth’s ownership in BY direct or indirect after this transaction?

The reported ownership of 19,100 shares is classified as indirect. The Form 4 states the shares are held by The Herseth Family Revocable Trust Dated 12/02/25, rather than in Mary Jo S. Herseth’s name directly.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/20/2026 - 01:13 PM Accepted by SEC EDGAR 08/20/2026 - 01:12 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^*

HERSETH MARY JO S.

(Last) (First) (Middle)

180 NORTH LASALLE STREET

SUITE 300

(Street)

CHICAGO ILLINOIS 60601

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026

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

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

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

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	08/19/2026		P		300	A	$38.395	19,100	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	08/20/2026
	** 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.
* Form 4: SEC 1474 (03-26)