BYLINE BANCORP, INC. common stock is reported as beneficially owned by MBG Investors I, L.P. and Antonio del Valle Perochena in this amended Schedule 13G. MBG reports beneficial ownership of 11,535,145 shares, representing 25.5% of the common stock outstanding. Antonio del Valle Perochena reports beneficial ownership of 11,575,953 shares, or 25.6%, including 40,808 shares held with sole voting and dispositive power and the remainder with shared power.
The amendment reflects a reduction in MBG’s beneficial ownership following the issuer’s repurchase of 300,000 shares from MBG under a Stock Repurchase Agreement dated August 7, 2026. The issuer agreed to purchase these shares at $39.10 per share, for an aggregate purchase price of $11.73 million, based on the five-day average closing price on the NYSE from July 27–31, 2026. Percent-of-class figures are calculated using 45,186,420 shares outstanding as of August 3, 2026.
Positive
None.
Negative
None.
Key Figures
MBG beneficial ownership:11,535,145 sharesMBG percent of class:25.5%Antonio del Valle Perochena beneficial ownership:11,575,953 shares+5 more
8 metrics
MBG beneficial ownership11,535,145 sharesMBG Investors I, L.P. reported beneficial ownership of BY common stock
MBG percent of class25.5%MBG’s reported percentage of BY common stock outstanding
Antonio del Valle Perochena beneficial ownership11,575,953 sharesTotal BY shares beneficially owned by Antonio del Valle Perochena
Antonio del Valle Perochena percent of class25.6%Reported percentage of BY common stock outstanding
Issuer share repurchase size300,000 sharesShares of BY common stock repurchased from MBG under the Stock Repurchase Agreement
Repurchase price per share$39.10 per sharePrice BY agreed to pay MBG for the repurchased shares
Aggregate repurchase price$11.73 millionTotal consideration for BY’s repurchase of 300,000 shares from MBG
Shares outstanding45,186,420 sharesBY common shares outstanding as of August 3, 2026 used for ownership calculations
Key Terms
beneficial ownership, Stock Repurchase Agreement, percent of class, dispositive power, +1 more
5 terms
beneficial ownershipfinancial
"This /A is being filed to reflect the reduction in MBG's beneficial ownership"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Stock Repurchase Agreementfinancial
"pursuant to a Stock Repurchase Agreement (the "Stock Repurchase Agreement") dated as of August 7, 2026"
percent of classfinancial
"Percent of class calculations are based on 45,186,420 shares of Common Stock outstanding"
Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.
dispositive powerfinancial
"Sole Dispositive Power 8 | Shared Dispositive Power 11,535,145.00"
Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.
shared voting powerfinancial
"Shared Voting Power 11,535,145.00 7 | Sole Dispositive Power"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
FAQ
What percentage of BY common stock does MBG Investors I, L.P. report owning in this Schedule 13G/A?
MBG Investors I, L.P. reports beneficial ownership of 25.5% of BY common stock, corresponding to 11,535,145 shares. This percentage is calculated using 45,186,420 shares outstanding as of August 3, 2026.
How many BY shares does Antonio del Valle Perochena report as beneficially owned?
Antonio del Valle Perochena reports beneficial ownership of 11,575,953 BY shares, representing 25.6% of the common stock. This total includes 40,808 shares with sole voting and dispositive power and the balance with shared power.
What BY share repurchase from MBG is disclosed in this Schedule 13G/A amendment for BY?
The amendment reports that BY repurchased 300,000 shares of common stock from MBG. The transaction occurred under a Stock Repurchase Agreement dated August 7, 2026, and reduced MBG’s reported beneficial ownership position.
At what price did BY repurchase shares from MBG Investors I, L.P., and what was the total amount?
BY agreed to repurchase the shares at $39.10 per share, for an aggregate purchase price of $11.73 million. The price was based on the five-day average closing price on the NYSE from July 27–31, 2026.
What share count did the BY Schedule 13G/A use to calculate ownership percentages?
Ownership percentages are based on 45,186,420 BY shares of common stock outstanding. This figure comes from the company’s Quarterly Report on Form 10-Q, which reported shares outstanding as of August 3, 2026.
How are sole and shared voting power over BY shares allocated for MBG and Antonio del Valle Perochena?
MBG reports 11,535,145 BY shares with shared voting and dispositive power. Antonio del Valle Perochena reports 40,808 shares with sole voting and dispositive power and 11,535,145 shares with shared voting and dispositive power.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 4)
BYLINE BANCORP, INC
(Name of Issuer)
Common Stock, par value $0.01 per share
(Title of Class of Securities)
124411109
(CUSIP Number)
08/07/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
124411109
1
Names of Reporting Persons
MBG INVESTORS I, LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
ONTARIO, CANADA
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
6
Shared Voting Power
11,535,145.00
7
Sole Dispositive Power
8
Shared Dispositive Power
11,535,145.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
11,535,145.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.5 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
124411109
1
Names of Reporting Persons
ANTONIO DEL VALLE PEROCHENA
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
MEXICO
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
40,808.00
6
Shared Voting Power
11,535,145.00
7
Sole Dispositive Power
40,808.00
8
Shared Dispositive Power
11,535,145.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
11,575,953.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.6 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
BYLINE BANCORP, INC
(b)
Address of issuer's principal executive offices:
180 NORTH LASALLE STREET, SUITE 300, CHICAGO, IL, 60601.
Item 2.
(a)
Name of person filing:
MBG Investors I, L.P., a Canadian limited partnership ("MBG") and Antonio del Valle Perochena, a Mexican citizen (together with MBG, the "Reporting Persons").
(b)
Address or principal business office or, if none, residence:
365 Bay Street, Suite 800, M5H2V1 Toronto, Ontario, Canada.
(c)
Citizenship:
The place of organization of MBG is Toronto, Ontario, Canada.
The citizenship of Antonio del Valle Perochena is Mexican.
(d)
Title of class of securities:
Common Stock, par value $0.01 per share
(e)
CUSIP No.:
124411109
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
See row 9 on each cover page above.
(b)
Percent of class:
See row 11 on each cover page above.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See row 5 on each cover page above.
(ii) Shared power to vote or to direct the vote:
See row 6 on each of cover page above.
(iii) Sole power to dispose or to direct the disposition of:
See row 7 on each cover page above.
(iv) Shared power to dispose or to direct the disposition of:
See row 8 on each cover page above.
This Schedule 13G/A is being filed to reflect the reduction in MBG's beneficial ownership as a result of the sale to and repurchase by 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 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, for an aggregate purchase price of $11.73 million.
Percent of class calculations are based on 45,186,420 shares of Common Stock outstanding as of August 3, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q filed on August 6, 2026.
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
Not Applicable
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
