Byline Bancorp insider sells 300,000 shares to issuer

Rhea-AI Filing Summary

Byline Bancorp, Inc. director and ten percent owner Antonio Del Valle Perochena reported an indirect sale of 300,000 shares of common stock at $39.10 per share on August 7, 2026, executed by MBG Investors I, L.P. under a Stock Repurchase Agreement with the issuer. Following this transaction, indirect holdings reported were 11,535,145 shares, with an additional 40,808 shares held directly.

Insider Trade Summary

Net Seller: 300,000 shares

Net Sell 2 txns

Insider DEL VALLE PEROCHENA ANTONIO

Role Director, 10% Owner

Sold 300,000 shs ($11.73M)

Type	Security	Shares	Price	Value
Sale	Common stock F1	300,000	$39.10	$11.73M
holding	Common stock	--	--	--

Holdings After Transaction: Common stock — 11,535,145 shares (Indirect, By MBG Investors I, L.P.); Common stock — 40,808 shares (Direct)

Footnotes (1)

1. F1. Sale to and repurchase by Byline Bancorp, Inc. ("the Issuer") of 300,000 shares of Common Stock (the "Shares") pursuant to a Stock Repurchase Agreement (the "Stock Repurchase Agreement") dated as of August 7, 2026 between MBG Investors I, L.P. and the Issuer. Under the Stock Repurchase Agreement, the Issuer agreed to purchase the Shares at a price of $39.10 per Share, which price was determined based on the five (5) day average closing price for the Common Stock on the NYSE for the period from July 27, 2026 through July 31, 2026.

Key Figures

Shares sold: 300,000 shares Sale price per share: $39.10 per share Indirect holdings after transaction: 11,535,145 shares +2 more

5 metrics

Shares sold 300,000 shares Common stock repurchased by issuer on August 7, 2026

Sale price per share $39.10 per share Price under Stock Repurchase Agreement for the 300,000 shares

Indirect holdings after transaction 11,535,145 shares Common stock held indirectly via MBG Investors I, L.P. after sale

Direct holdings after transaction 40,808 shares Common stock held directly after reported transactions

Pricing reference period July 27–31, 2026 Five-day NYSE average used to set $39.10 repurchase price

Key Terms

Stock Repurchase Agreement, five (5) day average closing price, ten percent owner

3 terms

Stock Repurchase Agreement financial

"pursuant to a Stock Repurchase Agreement (the "Stock Repurchase Agreement") dated as of"

five (5) day average closing price financial

"price was determined based on the five (5) day average closing price for"

ten percent owner regulatory

"reporting person is marked as a director and ten percent owner"

FAQ

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

What insider transaction did BY report for Antonio Del Valle Perochena?

Antonio Del Valle Perochena reported an indirect sale of 300,000 BY common shares on August 7, 2026, at $39.10 per share, executed via MBG Investors I, L.P. in a repurchase by Byline Bancorp.

At what price were the 300,000 BY shares repurchased by Byline Bancorp?

The 300,000 BY shares were repurchased at $39.10 per share. This price was based on the five-day average closing price on the NYSE from July 27, 2026 through July 31, 2026.

How many BY shares does Antonio Del Valle Perochena hold after this Form 4 transaction?

After the transaction, reported indirect holdings were 11,535,145 BY common shares through MBG Investors I, L.P., and direct holdings were 40,808 BY shares, as disclosed in the Form 4 data.

Who actually sold the 300,000 BY shares disclosed in this Form 4?

The 300,000 BY shares were sold by MBG Investors I, L.P., an entity associated with Antonio Del Valle Perochena, in a transaction where Byline Bancorp repurchased the shares under a Stock Repurchase Agreement.

Was the BY insider sale conducted under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked as a 10b5-1 plan, and the footnote describes a negotiated Stock Repurchase Agreement rather than a pre-arranged trading plan.

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

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Available on EDGAR 08/11/2026 - 04:05 PM Accepted by SEC EDGAR 08/11/2026 - 04:05 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^*

DEL VALLE PEROCHENA ANTONIO

(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	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/07/2026

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	08/07/2026		S		300,000(1)	D	$39.1	11,535,145	I	By MBG Investors I, L.P.
Common stock								40,808	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:

1. Sale to and repurchase by Byline Bancorp, Inc. ("the Issuer") of 300,000 shares of Common Stock (the "Shares") pursuant to a Stock Repurchase Agreement (the "Stock Repurchase Agreement") dated as of August 7, 2026 between MBG Investors I, L.P. and the Issuer. Under the Stock Repurchase Agreement, the Issuer agreed to purchase the Shares at a price of $39.10 per Share, which price was determined based on the five (5) day average closing price for the Common Stock on the NYSE for the period from July 27, 2026 through July 31, 2026.

	/s/ Thomas J. Bell, III, Attorney-in-Fact	08/11/2026
	** 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)