AllianceBernstein L.P. (MNSB) discloses 554,723 shares, 7.5% stake

Rhea-AI Filing Summary

AllianceBernstein L.P. filed Amendment No. 3 to a Schedule 13G/A reporting beneficial ownership of 554,723 shares of MainStreet Bancshares Inc common stock, representing 7.5% of the class as of 03/31/2026. AllianceBernstein states sole voting and sole dispositive power over the 554,723 shares, held for investment purposes on behalf of client discretionary advisory accounts. The form is signed by a compliance officer on 05/15/2026.

Insights

Compliance Counsel

Amendment confirms beneficial ownership and voting/dispositive authority.

AllianceBernstein reports holding 554,723 shares of MainStreet Bancshares and discloses sole voting and sole dispositive power over those shares as of 03/31/2026. The filing is an Amendment No. 3 to a Schedule 13G/A, which is the vehicle for passive/beneficial ownership disclosures.

The statement that holdings are held "for investment purposes on behalf of client discretionary investment advisory accounts" frames the ownership as client-directed. Subsequent filings may clarify any change in ownership percentage or voting status.

Equity Analyst

Large institutional position reported: 7.5% stake disclosed.

The filing shows an institutional position of 554,723 shares representing 7.5% of the class, reported under Schedule 13G/A. The holder attributes decisions to client discretionary accounts rather than the parent company.

For market context, watch future amendments for any change in percent ownership or transfers; the filing includes a signature dated 05/15/2026.

Key Figures

Shares beneficially owned: 554,723 shares Percent of class: 7.5% Reporting period: 03/31/2026 +1 more

4 metrics

Shares beneficially owned 554,723 shares Amount reported held by AllianceBernstein

Percent of class 7.5% Percentage of MainStreet Bancshares common stock reported

Reporting period 03/31/2026 Header date associated with the filing's position

Signature date 05/15/2026 Date the Schedule 13G/A amendment was signed

Key Terms

beneficially owned, sole dispositive power, Schedule 13G/A

3 terms

beneficially owned regulatory

"Amount beneficially owned: 554,723 shares acquired solely for investment purposes"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 554,723"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13G/A regulatory

"Amendment No. 3 to a Schedule 13G/A reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

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

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Accepted by SEC EDGAR 05/18/2026 - 01:22 PM Learn about SEC filing dates

FAQ

What stake does AllianceBernstein (MNSB) report?

AllianceBernstein reports beneficial ownership of 554,723 shares, equivalent to 7.5% of MainStreet Bancshares' common stock as of 03/31/2026.

Does AllianceBernstein have voting control over the shares?

Yes. The filing states AllianceBernstein has sole voting power and sole dispositive power over the 554,723 shares reported in the Schedule 13G/A.

Why does the filing say shares are held for "investment purposes"?

The filing states the shares are held for investment purposes on behalf of client discretionary investment advisory accounts, indicating holdings are managed for clients rather than as direct corporate control.

What dates are shown on the filing for the position and signature?

The reported position is dated 03/31/2026 in the header; the form is signed by a compliance associate on 05/15/2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

MainStreet Bancshares Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

56064Y100

(CUSIP Number)

03/31/2026

(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): 56064Y100

1

Names of Reporting Persons

AllianceBernstein L.P.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 554,723.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 554,723.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

554,723.00

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)

7.5 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MainStreet Bancshares Inc
(b)	Address of issuer's principal executive offices: 10089 FAIRFAX BOULEVARD,, FAIRFAX,, VA, 22030
Item 2.
(a)	Name of person filing: AllianceBernstein L.P. ("AllianceBernstein L.P.")
(b)	Address or principal business office or, if none, residence: 501 Commerce Street, Nashville, TN 37203 All media outlets, please contact Jennifer Will at AllianceBernstein (212-969-1157) with any questions. All other questions can be directed to Section13USFilings@alliancebernstein.com.
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 56064Y100
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: 554,723 shares acquired solely for investment purposes on behalf of client discretionary investment advisory accounts.* *AllianceBernstein L.P. is a majority owned subsidiary of Equitable Holdings, Inc. ("EQH"). AllianceBernstein operates under independent management and makes independent decisions from EQH and its respective subsidiaries, and EQH calculates and reports beneficial ownership separately from AllianceBernstein pursuant to guidance provided by the Securities and Exchange Commission in Release Number 34-39538 (January 12, 1998).
(b)	Percent of class: 7.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 554,723
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 554,723
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

AllianceBernstein L.P.

Signature:	Marcus Edwards
Name/Title:	AVP/ Senior Compliance Associate
Date:	05/15/2026