Changes in Beneficial Ownership · 4

Byline Bancorp, Inc.

BYNYSEEQUITYCurrent

Changes in Beneficial Ownership

Filed Aug 14, 2026Accepted Aug 14, 2026, 5:55 PM EDTFiling CIK 1702750Accession 0001214993-26-000004

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Structured filing — 4

form4-08142026_090819.xml

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Filing details

Report period: 2026-08-13
Issuer: BYLINE BANCORP, INC.
Issuer CIK: 0001702750
Trading symbol: BY

Reporting owner 1

Name: HERENCIA ROBERTO R
Reporting owner CIK: 0001214993
Relationship: Director · Officer
Officer title: CHIEF EXECUTIVE OFFICER
Address: 180 NORTH LASALLE STREET, SUITE 300, CHICAGO, IL, 60601

Non-derivative transactions

Non-derivative transactions · 1 reported row
Security	Transaction date	Code	Amount	A / D	Price (USD)	Owned after	Ownership
Common stock	2026-08-13	S · Form 4	19,750	D	39.2054	411,643	D

Table key

S · Form 4: Sale on the market or privately
D: Direct

Non-derivative holdings

Non-derivative holdings · 2 reported rows
Security	Amount owned	Ownership	Nature of ownership
Common stock	16,612	I	By Roberto Herencia Inc. Defined Benefit Plan
Common stock	2,575	I	By Roberto Herencia Inc. 401(k)

Table key

I: Indirect

Signature 1

Signed: /s/ Thomas J. Bell III, Attorney-in-Fact
Date: 2026-08-14

Company context

Headquartered in Chicago, Byline Bancorp, Inc. is the parent company of Byline Bank, a full service commercial bank serving small- and medium-sized businesses, financial sponsors, and consumers. Byline Bank has approximately $9.9 billion in assets and operates 44 branch locations throughout the Chicago and Milwaukee metropolitan areas. Byline Bank offers a broad range of commercial and community banking products and services including small ticket equipment leasing solutions and is one of the top Small Business Administration lenders in the United States.

Current securities

BYNYSE · EQUITY · Current

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