Who Owns MainStreet Bancshares Inc (MNSB)? -- Institutional Holders (2026-06-30)
97 institutions reported holding $99.8M of MainStreet Bancshares Inc (MNSB) in SEC 13F filings for 2026-06-30. Largest institutional holders: BANC FUNDS CO LLC ($13.5M), BlackRock, Inc. ($10.0M), ALLIANCEBERNSTEIN L.P. ($9.3M), VANGUARD GROUP INC ($8.6M), WELLINGTON MANAGEMENT GROUP LLP ($8.3M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | BANC FUNDS CO LLC | $13.5M | 545,679 | Added |
| 2 | BlackRock, Inc. | $10.0M | 404,037 | Added |
| 3 | ALLIANCEBERNSTEIN L.P. | $9.3M | 418,393 | Trimmed |
| 4 | VANGUARD GROUP INC | $8.6M | 346,860 | Trimmed |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | $8.3M | 336,961 | Trimmed |
| 6 | DIMENSIONAL FUND ADVISORS LP | $5.1M | 205,014 | Added |
| 7 | ACADIAN ASSET MANAGEMENT LLC | $4.5M | 183,245 | Added |
| 8 | FIRST MANHATTAN CO. LLC. | $4.0M | 161,731 | Trimmed |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $3.8M | 152,196 | Added |
| 10 | MARSHALL WACE, LLP | $3.0M | 120,194 | Added |
| 11 | STATE STREET CORP | $2.7M | 109,465 | Added |
| 12 | AMERICAN CENTURY COMPANIES INC | $2.5M | 101,604 | Added |
| 13 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $1.6M | 66,551 | Added |
| 14 | Cresset Asset Management, LLC | $1.5M | 59,040 | Trimmed |
| 15 | CITADEL ADVISORS LLC | $1.4M | 58,344 | Added |
| 16 | NORTHERN TRUST CORP | $1.2M | 48,150 | Added |
| 17 | Fourthstone LLC | $1.2M | 47,432 | Trimmed |
| 18 | Trexquant Investment LP | $975,872 | 39,525 | Added |
| 19 | Squarepoint Ops LLC | $919,283 | 37,233 | Trimmed |
| 20 | Empowered Funds, LLC | $917,752 | 37,171 | Added |
| 21 | UBS Group AG | $817,288 | 33,102 | Trimmed |
| 22 | Connor, Clark & Lunn Investment Management Ltd. | $750,206 | 30,385 | Trimmed |
| 23 | AQR CAPITAL MANAGEMENT LLC | $726,083 | 29,408 | New |
| 24 | STRS OHIO | $644,409 | 26,100 | Added |
| 25 | MORGAN STANLEY | $600,377 | 24,316 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30