Who owns MainStreet Bancshares, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of MNSB from SEC Form 13F filings across 96 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 96 institutions disclosed 4.1M shares of MainStreet Bancshares, Inc. worth $99.3M — about 56.6% of shares outstanding; the largest disclosed holder is BANC FUNDS CO LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
96
13F holders
$99.3M
value, 2026 filers
56.6%
of shares outstanding (4.1M sh)
18
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of MNSB's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BANC FUNDS CO LLC | 545,679 | $13.5M | 2.2% | 7.6% | +2.8% |
| 2 | ALLIANCEBERNSTEIN L.P. | 418,393 | $9.3M | 0.0% | 5.8% | -24.6% |
| 3 | BlackRock, Inc. | 404,037 | $10.0M | 0.0% | 5.6% | +16.2% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 336,961 | $8.3M | 0.0% | 4.7% | -4.5% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 262,466 | $6.5M | 0.0% | 3.7% | -12.9% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 205,014 | $5.1M | 0.0% | 2.9% | +23.0% |
| 7 | ACADIAN ASSET MANAGEMENT LLC | 183,245 | $4.5M | 0.0% | 2.6% | +36.8% |
| 8 | FIRST MANHATTAN CO. LLC. | 161,731 | $4.0M | 0.0% | 2.3% | -14.0% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 152,196 | $3.8M | 0.0% | 2.1% | +3.4% |
| 10 | MARSHALL WACE, LLP | 120,194 | $3.0M | 0.0% | 1.7% | +13.2% |
| 11 | STATE STREET CORP | 109,465 | $2.7M | 0.0% | 1.5% | +9.2% |
| 12 | AMERICAN CENTURY COMPANIES INC | 101,604 | $2.5M | 0.0% | 1.4% | +93.4% |
| 13 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 66,551 | $1.6M | 0.0% | 0.9% | +4.4% |
| 14 | Cresset Asset Management, LLC | 59,040 | $1.5M | 0.0% | 0.8% | -18.0% |
| 15 | CITADEL ADVISORS LLC | 58,344 | $1.4M | 0.0% | 0.8% | +148.1% |
| 16 | NORTHERN TRUST CORP | 48,150 | $1.2M | 0.0% | 0.7% | +2.6% |
| 17 | Fourthstone LLC | 47,432 | $1.2M | 0.8% | 0.7% | -87.7% |
| 18 | VANGUARD PORTFOLIO MANAGEMENT LLC | 42,813 | $1.1M | 0.0% | 0.6% | +7.9% |
| 19 | Trexquant Investment LP | 39,525 | $975,872 | 0.0% | 0.6% | +132.0% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 39,018 | $963,354 | 0.0% | 0.5% | +0.2% |
| 21 | Squarepoint Ops LLC | 37,233 | $919,283 | 0.0% | 0.5% | -26.8% |
| 22 | Empowered Funds, LLC | 37,171 | $917,752 | 0.0% | 0.5% | +8.1% |
| 23 | UBS Group AG | 33,102 | $817,288 | 0.0% | 0.5% | -70.8% |
| 24 | Connor, Clark & Lunn Investment Management Ltd. | 30,385 | $750,206 | 0.0% | 0.4% | -8.1% |
| 25 | AQR CAPITAL MANAGEMENT LLCNEW | 29,408 | $726,083 | 0.0% | 0.4% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.