MainStreet Bancshares, Inc. (MNSB) Ownership
MNSB ownership summary
as of October 18, 2026- Institutions
- 58.0% of shares outstanding
- Insiders
- 16.35% of shares outstanding
- Shares outstanding
- 7.1M
- Float
- 5.2M shares available to trade
- Short interest
- 3.06% 186K shares short
- Days to cover
- 7.02 short interest down 17.7% vs prior month
- Institutions 58.04%
- Insiders 16.35%
- Other investors 25.62%
MNSB top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Banc Funds Co LLC | 7.66% | 546K | $13.1M | +14,738 (+2.8%) | June 30, 2026 |
| 2 | AllianceBernstein L.P. | 5.88% | 418K | $10.0M | −136,330 (−24.6%) | June 30, 2026 |
| 3 | BlackRock Inc | 5.67% | 404K | $9.7M | +56,429 (+16.2%) | June 30, 2026 |
| 4 | Wellington Management Company LLP | 4.73% | 337K | $8.1M | −15,745 (−4.5%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.69% | 262K | $6.3M | −39,021 (−12.9%) | June 30, 2026 |
| 6 | Dimensional Fund Advisors, Inc. | 2.88% | 205K | $4.9M | +38,381 (+23.0%) | June 30, 2026 |
| 7 | Acadian Asset Management LLC | 2.57% | 183K | $4.4M | +49,269 (+36.8%) | June 30, 2026 |
| 8 | First Manhattan Co. LLC | 2.27% | 162K | $3.9M | −26,377 (−14.0%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.14% | 152K | $3.6M | +5,028 (+3.4%) | June 30, 2026 |
| 10 | Marshall Wace Asset Management Ltd | 1.69% | 120K | $2.9M | +13,969 (+13.2%) | June 30, 2026 |
| 11 | State Street Corp | 1.54% | 109K | $2.6M | +9,254 (+9.2%) | June 30, 2026 |
| 12 | American Century Companies Inc | 1.43% | 102K | $2.4M | +49,060 (+93.4%) | June 30, 2026 |
| 13 | Bridgeway Capital Management, LLC | 0.93% | 67K | $1.6M | +2,775 (+4.4%) | June 30, 2026 |
| 14 | Cresset Asset Management, LLC | 0.83% | 59K | $1.4M | −12,960 (−18.0%) | June 30, 2026 |
| 15 | Citadel Advisors Llc | 0.82% | 58K | $1.4M | +34,826 (+148.1%) | June 30, 2026 |
| 16 | Northern Trust Corp | 0.68% | 48K | $1.2M | +1,215 (+2.6%) | June 30, 2026 |
| 17 | Fourthstone LLC | 0.67% | 47K | $1.1M | −337,370 (−87.7%) | June 30, 2026 |
| 18 | Vanguard Portfolio Management, LLC | 0.60% | 43K | $1.0M | +3,152 (+7.9%) | June 30, 2026 |
| 19 | Trexquant Investment LP | 0.56% | 40K | $946,624 | +22,486 (+132.0%) | June 30, 2026 |
| 20 | Vanguard Fiduciary Trust Co | 0.55% | 39K | $934,481 | +67 (+0.2%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 301K shares and 6 cut 568K.
MNSB top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.70% | 192K | $4.6M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.27% | 162K | $3.9M | −1,856 (−1.1%) | September 30, 2026 |
| 3 | Avantis US Small Cap Value ETF | 1.84% | 131K | $3.1M | +384 (+0.3%) | September 30, 2026 |
| 4 | Fidelity Small Cap Index | 0.96% | 68K | $1.6M | +560 (+0.8%) | July 31, 2026 |
| 5 | iShares Russell 2000 Value ETF | 0.84% | 60K | $1.4M | +90 (+0.2%) | September 30, 2026 |
| 6 | DFA US Small Cap Value I | 0.83% | 59K | $1.4M | +5,252 (+9.7%) | August 31, 2026 |
| 7 | BSF Systematic US Eq Abs Ret A2 USD | 0.66% | 47K | $1.1M | — | December 31, 2025 |
| 8 | EA Bridgeway Omni Small-Cap Value ETF | 0.52% | 37K | $891,036 | — | September 30, 2026 |
| 9 | Vanguard Russell 2000 ETF | 0.50% | 36K | $853,099 | −884 (−2.4%) | September 30, 2026 |
| 10 | Dimensional US Small Cap Value ETF | 0.48% | 34K | $814,683 | — | September 24, 2026 |
| 11 | Fidelity Extended Market Index | 0.40% | 29K | $684,252 | −154 (−0.5%) | August 31, 2026 |
| 12 | DFA US Small Cap I | 0.35% | 25K | $594,511 | — | August 31, 2026 |
| 13 | Dimensional US Small Cap ETF | 0.33% | 23K | $557,484 | — | September 30, 2026 |
| 14 | Bridgeway Omni Small-Cap Value N | 0.29% | 20K | $488,101 | — | June 30, 2026 |
| 15 | iShares Micro-Cap ETF | 0.28% | 20K | $474,617 | −137 (−0.7%) | September 30, 2026 |
| 16 | Schwab Small Cap Index | 0.23% | 16K | $393,834 | — | August 31, 2026 |
| 17 | DFA US Targeted Value I | 0.23% | 16K | $390,864 | +763 (+4.9%) | August 31, 2026 |
| 18 | DFA US Micro Cap I | 0.18% | 13K | $315,086 | — | August 31, 2026 |
| 19 | iShares Russell 2000 Small-Cap Idx Instl | 0.17% | 12K | $291,831 | — | August 31, 2026 |
| 20 | Fidelity Total Market Index | 0.16% | 12K | $279,688 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MNSB insider transactions
latest 5| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-09 | Thomas J Chmelik | Sell | $20.09 | 7,238 | $145,411 |
| 2025-11-24 | Charles C Brockett | Buy | $18.95 | 123 | $2,331 |
| 2025-11-24 | Charles C Brockett | Buy | $19.03 | 619 | $11,780 |
| 2025-11-24 | Jeff W Dick | Buy | $18.99 | 106 | $2,013 |
| 2025-05-29 | Charles C Brockett | Buy | $19.12 | 120 | $2,294 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MNSB shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MNSB
Institutional investors own 58.0% of MainStreet Bancshares's shares and insiders 16.35%. The largest holder is Banc Funds Co LLC with 7.66% of the shares (546K), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 6 reduced their stake in the latest filings. Short interest is 3.06% of the float, or 7.02 days of average trading volume. The share count rose 157.0% since 2014.
Related: MNSB analyst forecast, MNSB key metrics, MNSB dividend history. See the MNSB stock overview for the latest quote and news.
MNSB ownership FAQ
Who owns the most MainStreet Bancshares stock?
The largest shareholders of MainStreet Bancshares are Banc Funds Co LLC (7.66%), AllianceBernstein L.P. (5.88%), BlackRock Inc (5.67%), Wellington Management Company LLP (4.73%), Vanguard Capital Management, LLC (3.69%).
What percentage of MainStreet Bancshares is owned by institutions?
Institutions hold 58.0% of MainStreet Bancshares's shares outstanding; insiders hold 16.35%.
Which funds own MainStreet Bancshares?
The largest fund holders of MainStreet Bancshares are Vanguard MStar Total Stk Mkt Idx Invest (2.70%), iShares Russell 2000 ETF (2.27%), Avantis US Small Cap Value ETF (1.84%), Fidelity Small Cap Index (0.96%), iShares Russell 2000 Value ETF (0.84%).
What is MainStreet Bancshares's short interest?
186K shares of MainStreet Bancshares were sold short, 3.06% of the float; at the average daily volume it would take 7.02 days to cover.
Are insiders buying or selling MainStreet Bancshares?
Of the latest 5 reported insider transactions in MainStreet Bancshares (since May 29, 2025), 4 were purchases and 1 were sales.
How many shares of MainStreet Bancshares are outstanding?
MainStreet Bancshares has 7.1M shares outstanding, of which 5.2M are in the public float.