AllianceBernstein reports 5.9% stake in MainStreet Bancshares

AllianceBernstein L.P. filed Amendment No. 4 to report beneficial ownership of MainStreet Bancshares Inc common stock.

Rhea-AI Filing Summary

AllianceBernstein L.P. filed Amendment No. 4 to report beneficial ownership of MainStreet Bancshares Inc common stock. As of June 30, 2026, AllianceBernstein reports beneficial ownership of 418,393 shares, held solely for investment purposes in client discretionary investment advisory accounts.

The position represents 5.9% of the outstanding common stock. AllianceBernstein has sole voting power and sole dispositive power over all 418,393 shares, with no shared voting or dispositive power. AllianceBernstein is a majority-owned subsidiary of Equitable Holdings, Inc., but states it operates under independent management and that Equitable Holdings calculates and reports beneficial ownership separately.

Key Figures

Shares beneficially owned: 418,393 shares Percent of class: 5.9% Sole voting power: 418,393 shares +1 more

4 metrics

Shares beneficially owned 418,393 shares Beneficial ownership of MainStreet Bancshares Inc common stock as of June 30, 2026

Percent of class 5.9% Percentage of MainStreet Bancshares Inc outstanding common stock represented by AllianceBernstein’s holdings

Sole voting power 418,393 shares Shares for which AllianceBernstein has sole power to vote or direct the vote

Sole dispositive power 418,393 shares Shares for which AllianceBernstein has sole power to dispose or direct the disposition

Key Terms

beneficially owned, sole voting power, sole dispositive power, discretionary investment advisory accounts, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 418,393 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 voting power financial

"Sole Voting Power 418,393.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 418,393.00 8 | Shared Dispositive Power 0.00"

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.

discretionary investment advisory accounts financial

"shares acquired solely for investment purposes on behalf of client discretionary investment advisory accounts"

Schedule 13G/A regulatory

"AllianceBernstein L.P. filed Amendment No. 4 on Schedule 13G/A"

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.

FAQ

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

What stake in MainStreet Bancshares Inc (MNSB) does AllianceBernstein report?

AllianceBernstein reports beneficial ownership of 418,393 shares of MainStreet Bancshares Inc common stock. This position represents 5.9% of the company’s outstanding common stock as of June 30, 2026, according to the Schedule 13G/A filing.

Does AllianceBernstein have voting control over its MNSB shares?

Yes. AllianceBernstein reports sole voting power over 418,393 shares of MainStreet Bancshares Inc and no shared voting power. It also reports sole dispositive power over the same number of shares, with zero shared dispositive power.

How are AllianceBernstein’s MNSB shares held according to the filing?

The 418,393 shares of MainStreet Bancshares Inc are held solely for investment purposes on behalf of client discretionary investment advisory accounts. AllianceBernstein is acting in its capacity as an investment adviser rather than as a proprietary holder.

What percentage of MainStreet Bancshares (MNSB) does 418,393 shares represent?

AllianceBernstein states that its 418,393-share position in MainStreet Bancshares Inc represents 5.9% of the outstanding common stock. This percentage is specifically disclosed in the ownership section of the Schedule 13G/A amendment.

What is the relationship between AllianceBernstein and Equitable Holdings in this MNSB filing?

AllianceBernstein is described as a majority owned subsidiary of Equitable Holdings, Inc. It states that it operates under independent management and that Equitable Holdings calculates and reports beneficial ownership separately from AllianceBernstein.

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

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Available on EDGAR 08/14/2026 - 03:50 PM Accepted by SEC EDGAR 08/14/2026 - 03:50 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

MainStreet Bancshares Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

56064Y100

(CUSIP Number)

06/30/2026

(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 418,393.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 418,393.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

418,393.00

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)

5.9 %

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: 418,393 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: 5.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 418,393
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 418,393
	(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:	08/14/2026