As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of MainStreet Bancshares, Inc. The largest reported stake is AllianceBernstein L.P.'s, at 5.9%. 10 filings are on record since November 14, 2025 (Schedule 13G/A, August 14, 2026).
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Key facts
- · Reporting person: AllianceBernstein L.P. · Sole voting: 418,393 · Shared voting: 0 · Sole dispositive: 418,393 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Fourthstone LLC · Sole voting: 0 · Shared voting: 47,432 · Sole dispositive: 0 · Shared dispositive: 47,432 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: BlackRock, Inc. · Sole voting: 390,859 · Shared voting: 0 · Sole dispositive: 396,555 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-29
- · Holder: AllianceBernstein L.P. · Percent: 7.5% · SCHEDULE 13G/A
- · Holder: Fourthstone LLC · Percent: 5.22% · SCHEDULE 13G/A
MainStreet Bancshares, Inc. has 10 Schedule 13D or 13G filings on record since 2025-11-14. 4 holders' latest filing reports 5% or more of common stock, par value $4.00 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| AllianceBernstein L.P. | 5.9% | 418,393 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Banc Fund X L.P. | 5.6% | 421,981 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
| BlackRock, Inc. | 5.6% | 396,555 | SCHEDULE 13G, 2026-07-29 | 2026-06-30 |
| MainStreet Bank 401(k) Retirement Plan | 5.1% | 383,763 | SCHEDULE 13G, 2026-02-24 | 2025-12-31 |
| Wellington Management Group LLP | 4.7% | 359,411 | SCHEDULE 13G/A, 2026-02-10 | 2025-12-31 |
| Fourthstone LLC | 0.67% | 47,432 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
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More on MainStreet Bancshares, Inc. and the records around it.
MainStreet Bancshares, Inc. elsewhere on the record
Companies that share a holder
- Banc Fund IX L.P. also filed stake reports on 14 other companies: Citizens Community Bancorp, Inc. (Feb 2026), FIRST NORTHERN COMMUNITY BANCORP (Feb 2026), First Western Financial Inc (Feb 2026)
- Fourthstone LLC also filed stake reports on 43 other companies: AVIDBANK HOLDINGS, INC. (Aug 2026), CF Bankshares Inc. (Aug 2026), Colony Bankcorp Inc (Aug 2026)
- AllianceBernstein L.P. also filed stake reports on 82 other companies: New Fortress Energy Inc (Nov 2026), RIVERNORTH OPPORTUNITIES FUND, INC. (Oct 2026), Trex Co Inc (Sep 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| AllianceBernstein L.P. | 418,393 | 0 | 418,393 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| BlackRock, Inc. | 390,859 | 0 | 396,555 | 0 | SCHEDULE 13G, 2026-07-29 |
| Fourthstone LLC | 0 | 47,432 | 0 | 47,432 | SCHEDULE 13G/A, 2026-08-14 |
| Fourthstone Master Opportunity Fund Ltd | 0 | 31,739 | 0 | 31,739 | SCHEDULE 13G/A, 2026-08-14 |
| Fourthstone GP LLC | 0 | 15,693 | 0 | 15,693 | SCHEDULE 13G/A, 2026-08-14 |
| Fourthstone QP Opportunity Fund LP | 0 | 10,590 | 0 | 10,590 | SCHEDULE 13G/A, 2026-08-14 |
| Fourthstone Small-Cap Financials Fund LP | 0 | 5,103 | 0 | 5,103 | SCHEDULE 13G/A, 2026-08-14 |
| L. Phillip Stone, IV | 0 | 47,432 | 0 | 47,432 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies MainStreet Bancshares, Inc. by CUSIP 56064Y100 and gives its principal executive office as 10089 FAIRFAX BOULEVARD, FAIRFAX (SCHEDULE 13G/A, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-14 | Fourthstone LLC | 6.62% | SCHEDULE 13G |
| 2026-02-10 | Wellington Management Group LLP | 4.7% | SCHEDULE 13G/A |
| 2026-02-13 | Banc Fund X L.P. | 5.6% | SCHEDULE 13G/A |
| 2026-02-13 | Fourthstone LLC | 9.96% | SCHEDULE 13G/A |
| 2026-02-24 | MainStreet Bank 401(k) Retirement Plan | 5.1% | SCHEDULE 13G |
| 2026-05-15 | Fourthstone LLC | 5.22% | SCHEDULE 13G/A |
| 2026-05-18 | AllianceBernstein L.P. | 7.5% | SCHEDULE 13G/A |
| 2026-07-29 | BlackRock, Inc. | 5.6% | SCHEDULE 13G |
| 2026-08-14 | AllianceBernstein L.P. | 5.9% | SCHEDULE 13G/A |
| 2026-08-14 | Fourthstone LLC | 0.67% | SCHEDULE 13G/A |
Questions about who owns MainStreet Bancshares, Inc.
Who owns MainStreet Bancshares, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of MainStreet Bancshares, Inc.: AllianceBernstein L.P. (5.9%, Schedule 13G/A, filed 2026-08-14), Banc Fund X L.P. (5.6%, Schedule 13G/A, filed 2026-02-13), BlackRock, Inc. (5.6%, Schedule 13G, filed 2026-07-29) and MainStreet Bank 401(k) Retirement Plan (5.1%, Schedule 13G, filed 2026-02-24).
Who are the largest shareholders of MainStreet Bancshares, Inc.?
By the share each holder's latest filing reports, the largest holders of MainStreet Bancshares, Inc. on this page are AllianceBernstein L.P. (5.9%), Banc Fund X L.P. (5.6%) and BlackRock, Inc. (5.6%).
When did AllianceBernstein L.P. buy into MainStreet Bancshares, Inc.?
The filings give report dates, not purchase dates. The earliest filing from AllianceBernstein L.P. on this page is the Schedule 13G/A, filed 2026-05-18, reporting 7.5%; its latest, Schedule 13G/A filed 2026-08-14, reports 5.9%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 10 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.