What does the Form 4 say about net insider share activity for BY (BYLINE BANCORP, INC.) in this filing?

This Form 4 shows a net buy of 100 BY common shares , all from an open-market purchase by the Kistner trust . There are no reported sales, exercises, gifts, or tax-withholding disposals in this filing, only this single purchase and one holding line.

Director Kistner trust buys BYLINE Bancorp (NYSE: BY) shares in market

Q: What insider transaction did BY (BYLINE BANCORP, INC.) report for William G. Kistner?

BYLINE BANCORP reported that director William G. Kistner , through a trust, completed an open-market purchase of 100 common shares . The transaction occurred at $31.97 per share , reflecting a modest increase in his indirect ownership position.

Q: At what price were the BY (BYLINE BANCORP, INC.) shares purchased in this Form 4?

The reported transaction shows an open-market purchase at $31.97 per share of BY common stock. This price applies to the 100 shares acquired indirectly by the William G. Kistner Trust Date June 22, 1973 on May 4, 2026.

Q: How many BY (BYLINE BANCORP, INC.) shares does the Kistner trust hold after the transaction?

After the reported transaction, the William G. Kistner Trust Date June 22, 1973 indirectly holds 14,189 shares of BY common stock . This figure reflects the updated position following the purchase of 100 additional shares at $31.97 per share.

Q: Does William G. Kistner hold BY (BYLINE BANCORP, INC.) shares directly as well as through a trust?

Yes. The filing lists 1,036 BY common shares held directly as a holding entry for William G. Kistner. Separately, a related trust, the William G. Kistner Trust Date June 22, 1973 , now indirectly holds 14,189 shares after the reported purchase.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

BYLINE BANCORP director William G. Kistner reported a small open-market share purchase. On May 4, 2026, a trust associated with him, the William G. Kistner Trust Date June 22, 1973, bought 100 shares of BY common stock at $31.97 per share in an open-market transaction.

Following this purchase, the trust’s indirect holdings increased to 14,189 common shares. Separately, Kistner is shown with 1,036 common shares held directly, listed as a holding entry without a new transaction code.

Insider Trade Summary

Net Buyer: 100 shares ($3,197)

Net Buy 2 txns

Insider KISTNER WILLIAM G

Role null

Bought 100 shs ($3K)

Type	Security	Shares	Price	Value
Purchase	Common stock	100	$31.97	$3K
holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 14,189 shares (Indirect, William G. Kistner Trust Date June 22, 1973); Common stock — 1,036 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 100 shares Purchase price: $31.97 per share Indirect holdings after trade: 14,189 shares +2 more

5 metrics

Shares purchased 100 shares Open-market purchase on May 4, 2026

Purchase price $31.97 per share Price paid for common stock

Indirect holdings after trade 14,189 shares Held by William G. Kistner Trust Date June 22, 1973

Direct holdings 1,036 shares Common stock held directly by William G. Kistner

Net insider share change 100 shares Net-buy across all reported transactions

Key Terms

open-market purchase, indirect, Common stock, Form 4

4 terms

open-market purchase financial

"transaction_action": "open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect financial

""ownership_type": "indirect""

Common stock financial

""security_title": "Common stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

05/04/2026 - 04:05 PM

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

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)
05/04/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common stock	05/04/2026		P		100	A	$31.97	14,189	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

	/s/ Thomas J. Bell III, Attorney-in-Fact	05/04/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did BY (BYLINE BANCORP, INC.) report for William G. Kistner?

BYLINE BANCORP reported that director William G. Kistner, through a trust, completed an open-market purchase of 100 common shares. The transaction occurred at $31.97 per share, reflecting a modest increase in his indirect ownership position.

At what price were the BY (BYLINE BANCORP, INC.) shares purchased in this Form 4?

The reported transaction shows an open-market purchase at $31.97 per share of BY common stock. This price applies to the 100 shares acquired indirectly by the William G. Kistner Trust Date June 22, 1973 on May 4, 2026.

How many BY (BYLINE BANCORP, INC.) shares does the Kistner trust hold after the transaction?

After the reported transaction, the William G. Kistner Trust Date June 22, 1973 indirectly holds 14,189 shares of BY common stock. This figure reflects the updated position following the purchase of 100 additional shares at $31.97 per share.

Does William G. Kistner hold BY (BYLINE BANCORP, INC.) shares directly as well as through a trust?

Yes. The filing lists 1,036 BY common shares held directly as a holding entry for William G. Kistner. Separately, a related trust, the William G. Kistner Trust Date June 22, 1973, now indirectly holds 14,189 shares after the reported purchase.