Byline Bancorp: Ptacin trust sells 16,100 shares

The two reported sales used separate per-share prices; Ptacin's directly held position after the transactions was listed as 25,859 shares.

Available on EDGAR 11/02/2026 - 02:52 PM EST Accepted by SEC EDGAR 11/02/2026 - 02:52 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Byline Bancorp, Inc.'s Head of Commercial Banking, Brogan Ptacin, reported that the Brogan M. Ptacin Rev Trust, with Brogan M. Ptacin as trustee, sold 16,100 shares of common stock on October 29, 2026. The two reported sales were 14,229 shares at $38.9037 per share and 1,871 shares at $39.0476 per share. No Rule 10b5-1 plan is reported. Ptacin reported 25,859 shares held directly after the transactions.

Insider Trade Summary

Net Seller: 16,100 shares

Net Sell 2 txns

Insider Ptacin Brogan

Role HEAD OF COMMERCIAL BANKING

Sold 16,100 shs ($627K)

Share of Position Sold 59.2%

Type	Security	Shares	Price	Value
Sale	Common stock	14,229	$38.9037	$554K
Sale	Common stock	1,871	$39.0476	$73K
Holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 11,100 shares (Indirect, By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE); Common stock — 25,859 shares (Direct)

Holdings Before and After: Common stock, 27,200 to 11,100 shares (Indirect, By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE)

Key Figures

Shares sold: 16,100 shares First sale: 14,229 shares First sale price: $38.9037 per share +3 more

6 metrics

Shares sold 16,100 shares Two reported sales on October 29, 2026

First sale 14,229 shares October 29, 2026

First sale price $38.9037 per share October 29, 2026

Second sale 1,871 shares October 29, 2026

Second sale price $39.0476 per share October 29, 2026

Direct shares held 25,859 shares Reported after the transactions on October 29, 2026

Key Terms

Rule 10b5-1 plan, Rev Trust, TTEE

3 terms

Rule 10b5-1 plan regulatory

"Rule 10b5-1 plan"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

Rev Trust regulatory

"Brogan M. Ptacin Rev Trust"

TTEE regulatory

"Brogan M. Ptacin TTEE"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many BY shares did Brogan Ptacin's trust sell, and at what prices?

The Brogan M. Ptacin Rev Trust sold 16,100 BY common shares on October 29, 2026, in two reported sales: 14,229 shares at $38.9037 per share and 1,871 shares at $39.0476 per share. No Rule 10b5-1 plan is reported.

How many BY shares did Brogan Ptacin hold directly after the sales?

Brogan Ptacin reported 25,859 BY common shares held directly after the transactions.

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

Form 4 Insider Transactions: What Each Field Means →

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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 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/29/2026

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	10/29/2026		S		14,229	D	$38.9037	12,971	I	By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE
Common stock	10/29/2026		S		1,871	D	$39.0476	11,100	I	By Brogan M. Ptacin Rev Trust Dtd 3/24/2004 Brogan M. Ptacin TTEE
Common stock								25,859	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	11/02/2026
	** 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)