Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in MNSB held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BANC FUNDS CO LLC | 546K | $13.5M | +2.8% | 7.667% | 2.23% |
| 2 | BlackRock, Inc. | 404K | $10.0M | +16.2% | 5.677% | 0.00% |
| 3 | ALLIANCEBERNSTEIN L.P. | 418K | $9.3M | -24.6% | 5.878% | 0.00% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 337K | $8.3M | -4.5% | 4.734% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 262K | $6.5M | -12.9% | 3.688% | 0.00% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 205K | $5.1M | +23.0% | 2.880% | 0.00% |
| 7 | FIRST MANHATTAN CO. LLC. | 162K | $4.0M | -14.0% | 2.272% | 0.01% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 152K | $3.8M | +3.4% | 2.138% | 0.00% |
| 9 | MARSHALL WACE, LLP | 120K | $3.0M | +13.2% | 1.689% | 0.00% |
| 10 | STATE STREET CORP | 109K | $2.7M | +9.2% | 1.538% | 0.00% |
| 11 | AMERICAN CENTURY COMPANIES INC | 102K | $2.5M | +93.4% | 1.427% | 0.00% |
| 12 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 67K | $1.6M | +4.3% | 0.935% | 0.03% |
| 13 | Cresset Asset Management, LLC | 59K | $1.5M | -18.0% | 0.830% | 0.01% |
| 14 | CITADEL ADVISORS LLC | 58K | $1.4M | +148.1% | 0.820% | 0.00% |
| 15 | NORTHERN TRUST CORP | 48K | $1.2M | +2.6% | 0.676% | 0.00% |
| 16 | Fourthstone LLC | 47K | $1.2M | -87.7% | 0.666% | 0.84% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT LLC | 43K | $1.1M | +8.0% | 0.602% | 0.00% |
| 18 | Trexquant Investment LP | 40K | $976K | +132.0% | 0.555% | 0.01% |
| 19 | VANGUARD FIDUCIARY TRUST CO | 39K | $963K | +0.2% | 0.548% | 0.00% |
| 20 | Squarepoint Ops LLC | 37K | $919K | -26.8% | 0.523% | 0.00% |
| 21 | Empowered Funds, LLC | 37K | $918K | +8.1% | 0.522% | 0.00% |
| 22 | UBS Group AG | 33K | $817K | -70.8% | 0.465% | 0.00% |
| 23 | Connor, Clark & Lunn Investment Management Ltd. | 30K | $750K | -8.1% | 0.427% | 0.00% |
| 24 | AQR CAPITAL MANAGEMENT LLC | 29K | $726K | — | 0.413% | 0.00% |
| 25 | STRS OHIO | 26K | $644K | +5120.0% | 0.367% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MNSB — a direct measure of their conviction.
Filings activity in MNSB during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 95 | +16% | 56.96% | 2.29 pp | $93M | +4.2% |
| Q1 2026 | 82 | +12% | 59.25% | 5.64 pp | $90M | 4.9% |
| Q4 2025 | 73 | +9.0% | 64.89% | +10.55 pp | $94M | +14% |
| Q3 2025 | 67 | +9.8% | 54.34% | 2.46 pp | $83M | +5.8% |
| Q2 2025 | 61 | +20% | 56.80% | +7.61 pp | $78M | +31% |
| Q1 2025 | 51 | 1.9% | 49.19% | 1.80 pp | $60M | 9.2% |
| Q4 2024 | 52 | 1.9% | 50.99% | +0.25 pp | $66M | 1.7% |
| Q3 2024 | 53 | — | 50.74% | — | $67M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MNSB stock.
Based on Q2 2026 13F filings, institutional ownership of MainStreet Bancshares, Inc. stands at 57.0%, held across 95 reporting institutions.
BANC FUNDS CO LLC is the largest reported institutional holder of MNSB, with approximately 545,679 shares worth $0.01B as of Q2 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of MNSB, including CITADEL ADVISORS LLC.
Our composite Smart Money Score for MNSB is 49 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
15 institutions opened new positions in MNSB during Q2 2026, while 3 fully exited. 63 added to existing positions and 15 trimmed.
MNSB institutional ownership fell by 2.29 percentage points quarter-over-quarter, with a net change of +13 holders.
The top 10 institutions account for 70.7% of all reported 13F value in MNSB, and the top 25 account for 89.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
MainStreet Bancshares, Inc. (MNSB) Institutional Ownership