MainStreet Bancshares, Inc.
MNSB- Exchange
- Nasdaq
- Industry
- State Commercial Banks
- SEC CIK
- 0001693577
No open-market purchases or sales by MainStreet Bancshares, Inc. insiders were filed in the last 90 days; 96 institutions reported holding it in 13F filings for Q2 2026, worth $99.3M in total; no superinvestor holds it.
Other share classesMNSBP
Holders of 5% or more of MNSB
Holders whose latest Schedule 13D or 13G filing reports 5% or more of MainStreet Bancshares, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Alliancebernstein L.P. | 13G/A | 7.50%554.7K shares | −1.00 ppfrom 8.50% | Nov 15, 20242 filings | May 18, 2026 | SEC |
| Banc Funds Co LLC | 13G/A | 5.60%422.0K shares | – | Feb 13, 20261 filing | Feb 13, 2026 | SEC |
| Fourthstone LLC | 13G/A | 5.22%384.8K shares | −4.74 ppfrom 9.96% | Nov 14, 20253 filings | May 15, 2026 | SEC |
| MainStreet Bank 401(k) Retirement Plan | 13G | 5.10%383.8K shares | New | Feb 24, 20261 filing | Feb 24, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on MainStreet Bancshares, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 18, 20261:22 PM ET | Alliancebernstein L.P. | 13G/A | 7.50%554.7K shares | −1.00 ppfrom 8.50% | Mar 31, 2026 | SEC |
| May 15, 20264:52 PM ET | Fourthstone LLCand 5 others | 13G/A | 5.22%384.8K shares | −4.74 ppfrom 9.96% | Mar 31, 2026 | SEC |
| Feb 24, 20264:11 PM ET | MainStreet Bank 401(k) Retirement Plan | 13G | 5.10%383.8K shares | New | Dec 31, 2025 | SEC |
| Feb 13, 20268:43 PM ET | Banc Funds Co LLCand 3 others | 13G/A | 5.60%422.0K shares | – | Dec 31, 2025 | SEC |
| Feb 13, 20264:08 PM ET | Fourthstone LLCand 5 others | 13G/A | 9.96%767.8K shares | +3.34 ppfrom 6.62% | Dec 31, 2025 | SEC |
| Feb 10, 202611:21 AM ET | Wellington Management Group LLPand 2 others | 13G/A | 4.70%359.4K shares | –Below 5% | Dec 31, 2025 | SEC |
| Nov 14, 202510:52 AM ET | Fourthstone LLCand 5 others | 13G | 6.62%509.9K shares | New | Sep 30, 2025 | SEC |
| Nov 15, 20241:44 PM ET | Alliancebernstein L.P. | 13G/A | 8.50%648.8K shares | – | Sep 30, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell MainStreet Bancshares, Inc. shares.
No Form 144 notices for MainStreet Bancshares, Inc. are on file.