Who owns MainStreet Bancshares, Inc.?
Institutional ownership of MNSB from SEC Form 13F filings across 75 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.
75
13F holders
$65.0M
value, 2026 filers
40.5%
of shares outstanding (2.9M sh)
12
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 | ALLIANCEBERNSTEIN L.P. | 418,393 | $9.3M | 0.0% | 5.9% | -24.6% |
| 2 | BlackRock, Inc. | 404,037 | $10.0M | 0.0% | 5.7% | +16.2% |
| 3 | WELLINGTON MANAGEMENT GROUP LLP | 336,961 | $8.3M | 0.0% | 4.7% | -4.5% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 262,466 | $6.5M | 0.0% | 3.7% | -56.5% |
| 5 | ACADIAN ASSET MANAGEMENT LLC | 183,245 | $4,518 | 0.0% | 2.6% | +36.8% |
| 6 | FIRST MANHATTAN CO. LLC. | 161,731 | $4.0M | 0.0% | 2.3% | -14.0% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 152,196 | $3.8M | 0.0% | 2.1% | +3.4% |
| 8 | MARSHALL WACE, LLP | 120,194 | $3.0M | 0.0% | 1.7% | +13.2% |
| 9 | AMERICAN CENTURY COMPANIES INC | 101,604 | $2.5M | 0.0% | 1.4% | +93.4% |
| 10 | Cresset Asset Management, LLC | 59,040 | $1.5M | 0.0% | 0.8% | -18.0% |
| 11 | CITADEL ADVISORS LLC | 58,344 | $1.4M | 0.0% | 0.8% | +148.1% |
| 12 | NORTHERN TRUST CORP | 48,150 | $1.2M | 0.0% | 0.7% | +2.6% |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | 42,813 | $1.1M | 0.0% | 0.6% | +7.9% |
| 14 | VANGUARD FIDUCIARY TRUST CO | 39,018 | $963,354 | 0.0% | 0.5% | +0.2% |
| 15 | Squarepoint Ops LLC | 37,233 | $919,283 | 0.0% | 0.5% | -26.8% |
| 16 | UBS Group AG | 33,102 | $817,288 | 0.0% | 0.5% | -70.8% |
| 17 | Connor, Clark & Lunn Investment Management Ltd. | 30,385 | $750,206 | 0.0% | 0.4% | -8.1% |
| 18 | STRS OHIO | 26,100 | $644,409 | 0.0% | 0.4% | +5120.0% |
| 19 | MORGAN STANLEY | 24,316 | $600,377 | 0.0% | 0.3% | -0.3% |
| 20 | HRT FINANCIAL LPNEW | 24,284 | $599 | 0.0% | 0.3% | new |
| 21 | MENDON CAPITAL ADVISORS CORP | 23,370 | $577,005 | 0.2% | 0.3% | -50.6% |
| 22 | Creative Planning | 22,793 | $562,759 | 0.0% | 0.3% | +2.3% |
| 23 | Sixth Street Partners Management Company, L.P.NEW | 19,444 | $480,072 | 0.1% | 0.3% | new |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 19,444 | $480,072 | 0.0% | 0.3% | +9.2% |
| 25 | Nuveen, LLC | 17,867 | $441,136 | 0.0% | 0.3% | +95.0% |
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.