Were any of Brogan Ptacin’s BY share transactions open-market sales or purchases?

The Form 4 does not show open-market purchases or sales. Dispositions coded “F” reflect shares delivered to cover exercise price or tax liabilities, meaning shares were withheld for taxes rather than sold in the market for investment purposes.

What is Brogan Ptacin’s direct BY share ownership after these transactions?

After the reported transactions, Brogan Ptacin directly owns 25,859 Byline Bancorp common shares. This reflects the net effect of stock grants and tax-withholding dispositions on February 22, 2026, as shown in the non-derivative ownership table.

Byline exec gets stock awards, withholds shares for tax

BYLINE BANCORP, INC.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

BYLINE BANCORP, INC. Head of Commercial Banking Brogan Ptacin reported mixed equity compensation activity in company stock. On February 22, 2026, Ptacin acquired 3,866 and 2,415 shares of common stock through grants at $0.00 per share, including performance-vesting shares and restricted stock that vests over three years.

On the same date, 1,338 and 858 shares of common stock were disposed of at $33.13 per share to cover tax liabilities by delivering shares, rather than open‑market sales. After these transactions, Ptacin reported 25,859 shares of common stock held directly, 27,200 shares held indirectly through a revocable trust, and 9,450 stock options held directly.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider Ptacin Brogan

Role HEAD OF COMMERCIAL BANKING

Type	Security	Shares	Price	Value
Grant/Award	Common stock	3,866	$0.00	$0.00
Exercise Price or Tax Liability	Common stock	1,338	$33.13	$44K
Grant/Award	Common stock	2,415	$0.00	$0.00
Exercise Price or Tax Liability	Common stock	858	$33.13	$28K
holding	Stock Option	--	--	--
holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 25,859 shares (Direct); Stock Option — 9,450 contracts (Direct); Common stock — 27,200 shares (Indirect, By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE)

Footnotes (2)

F1. Represents shares of Common Stock earned upon performance-vesting of a previously awarded performance share grant.
F2. Represents restricted shares of Common Stock that will time vest over three years subject to continued employment with the issuer.

FAQ

What did BY (Byline Bancorp) executive Brogan Ptacin report in this Form 4?

Brogan Ptacin reported stock grants and related tax-withholding dispositions in Byline Bancorp common stock. The filing shows new performance-vesting and restricted share awards, plus shares withheld at $33.13 per share to satisfy tax obligations instead of cash payments.

How many BY common shares did Brogan Ptacin acquire in the latest Form 4?

Brogan Ptacin acquired 3,866 and 2,415 BY common shares through equity grants. These include performance-vesting shares earned from a prior award and new restricted shares that will vest over three years, contingent on continued employment with Byline Bancorp.

How many BY shares does Brogan Ptacin hold indirectly through a trust?

The Form 4 shows 27,200 BY common shares held indirectly. These are owned by the “Brogan M. Ptacin Rev Trust Dtd 3/24/2004,” with Brogan M. Ptacin listed as trustee, and are reported as indirect beneficial ownership.

What derivative BY securities does Brogan Ptacin report holding?

Brogan Ptacin reports holding 9,450 BY stock options as a derivative security. These options are listed as directly owned, and the total reflects holdings after the transactions on February 22, 2026, with no new option transactions reported in this filing.

What do the footnotes in Brogan Ptacin’s BY Form 4 explain?

The footnotes explain that part of the acquired BY shares are performance-vesting shares earned from a prior performance grant, and another portion are restricted shares that will time-vest over three years, subject to Ptacin’s continued employment with Byline Bancorp.

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

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Accepted by SEC EDGAR 02/24/2026 - 07:11 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^*

Ptacin Brogan

(Last)

(First)

(Middle)

180 N. LASALLE ST.

SUITE 300

(Street)

CHICAGO

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)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	HEAD OF COMMERCIAL BANKING

3. Date of Earliest Transaction (Month/Day/Year)
02/22/2026

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)
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	02/22/2026		A		3,866⁽¹⁾	A	$0	25,640	D
Common stock	02/22/2026		F		1,338	D	$33.13	24,302	D
Common stock	02/22/2026		A		2,415⁽²⁾	A	$0	26,717	D
Common stock	02/22/2026		F		858	D	$33.13	25,859	D
Common stock								27,200	I	By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE

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)
Stock Option	$12.7							05/31/2018	12/20/2026	Common stock	9,450		9,450	D

Explanation of Responses:

1. Represents shares of Common Stock earned upon performance-vesting of a previously awarded performance share grant.

2. Represents restricted shares of Common Stock that will time vest over three years subject to continued employment with the issuer.

	/s/ Thomas J. Bell III, Attorney-in-Fact	02/24/2026
	** 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.

Source: View Original Filing on SEC EDGAR