As of November 10, 2026, MainStreet Bancshares Inc is a publicly traded company (Nasdaq: MNSB); its largest reported holder is AllianceBernstein, with 5.9% on Schedule 13G/A of August 14, 2026, then BlackRock (5.6%). The largest insider holding is Jeff W. Dick, the chairman and chief executive, with 270,817 shares (3.8% of shares outstanding), per Form 4 of February 24, 2026 (Schedule 13G/A, August 14, 2026).
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Is MainStreet Bancshares Inc a real, registered company?
- MainStreet Bancshares Inc files with the SEC under CIK 1693577 (its SEC filings).
- Its shares are listed under the ticker MNSB on Nasdaq (also MNSBP) (SEC company record).
- Incorporated in Virginia; business address in Fairfax, Virginia, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MainStreet Bancshares Inc in our court records and SEC 8-K records (as of 2026-11-10).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names AllianceBernstein (filed 2026-08-14).
Who are MainStreet Bancshares Inc's owners and officers?
MainStreet Bancshares Inc: incorporated in Virginia; business address in Fairfax, Virginia; industry State Commercial Banks (Schedule 13G/A, 2026-08-14).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Alliancebernstein L.P. | 5.9% |
| Schedule 13G/A, 2026-08-14 | Fourthstone LLC | 0.67% |
| Schedule 13G, 2026-07-29 | Blackrock, Inc. | 5.6% |
| Schedule 13G/A, 2026-05-18 | Alliancebernstein L.P. | 7.5% |
| Schedule 13G/A, 2026-05-15 | Fourthstone LLC | 5.22% |
| Schedule 13G, 2026-02-24 | Mainstreet Bank 401(K) Retirement Plan | 5.1% |
| Schedule 13G/A, 2026-02-13 | Fourthstone LLC | 9.96% |
| Schedule 13G/A, 2026-02-13 | Banc Fund X L.P. | 5.6% |
| Schedule 13G/A, 2026-02-10 | Wellington Management Group LLP | 4.7% |
| Schedule 13G, 2025-11-14 | Fourthstone LLC | 6.62% |
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), Blackrock, Inc. (5.6%, Schedule 13G, filed 2026-07-29), Banc Fund X L.P. (5.6%, Schedule 13G/A, filed 2026-02-13) 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%), Blackrock, Inc. (5.6%) and Banc Fund X L.P. (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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What the Full Report on MainStreet Bancshares Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own MainStreet Bancshares Inc shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chairman and chief executive: 270,817 shares (3.8% of shares outstanding), 206,977 held directly and 63,840 indirectly (Form 4, 2026-02-24).
- , a director: 120,797 shares (1.7% of shares outstanding), 93,051 held directly and 27,746 indirectly (Form 4, 2025-11-24).
- , the senior executive vice president and a director: 117,756 shares (1.7% of shares outstanding), 60,962 held directly and 56,794 indirectly (Form 4, 2026-02-20).
- , the president and mainsteet bank: 44,659 shares (0.63% of shares outstanding), 33,502 held directly and 11,157 indirectly (Form 4, 2026-02-24).
- , the chief financial officer: 39,914 shares (0.56% of shares outstanding), 34,036 held directly and 5,878 indirectly (Form 4, 2026-06-04).
Shares outstanding: 7,117,442 as of 2026-10-31, from the company's latest SEC cover page.
How much has MainStreet Bancshares Inc raised?
No fundraising or offering filing from MainStreet Bancshares Inc is on file with us.
Keep reading
More on MainStreet Bancshares Inc and the records around it.
MainStreet Bancshares Inc elsewhere on the record
- 5%+ stake filings Aug 2026
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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