Latest Period
Q1 2026
Security Snapshot
MainStreet Bancshares, Inc. - Common Stock (MNSB) Institutional Ownership
CUSIP: 56064Y100
13F Institutional Holders and Ownership History from Q2 2016 to Q1 2026
Institutions Reporting
83
Shares (Excl. Options)
4,239,174
Price
$22.20
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- Security type / class
- Equity / Common Stock
- Symbol
- MNSB on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 4,239,174
- Total 13F value
- $93,089,993
- Portfolio coverage rank
- 0%
- Share change
- -514,608
- Value change
- -$11,138,966
- Number of holders
- 83
- Shares outstanding
- 7,396,307
- SEC-reported price per share
- $22.20
- Insider filing price
- $22.20
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MNSB - MainStreet Bancshares, Inc. - Common Stock is tracked under CUSIP 56064Y100.
- 83 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 75 to 83 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $96,690,484 to $93,089,993.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 83 institutions filings for Q1 2026.
Security key
56064Y100
Latest holder period
Q1 2026
13F holders
83
13D/G owners
4
CIK / CUSIP context first
Open Q1 2026 holders
MNSB full holder history
MainStreet Bancshares, Inc. SEC filings
MainStreet Bancshares, Inc. company facts
MainStreet Bancshares, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 56064Y100:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
4
Security
MNSB
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| ALLIANCEBERNSTEIN L.P. | 7.5% | -11% | $12,314,851 | -$2,088,443 | 554,723 | -14% | AllianceBernstein L.P. | 31 Mar 2026 |
| Fourthstone LLC | 5.2% | -47% | $8,542,604 | -$8,502,378 | 384,802 | -50% | Fourthstone LLC | 31 Mar 2026 |
| MainStreet Bank 401(k) Retirement Plan | 5.1% | $7,870,979 | 383,763 | MainStreet Bank 401(k) Retirement Plan | 31 Dec 2025 | |||
| WELLINGTON MANAGEMENT GROUP LLP | 4.7% | $7,317,608 | 359,411 | Wellington Management Group LLP | 31 Dec 2025 |
As of 31 Mar 2026, 83 institutional investors reported holding 4,239,174 shares of MainStreet Bancshares, Inc. - Common Stock (MNSB). This represents 57% of the company’s total 7,396,307 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
53%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| ALLIANCEBERNSTEIN L.P. | 7.5% | 554,723 | -19% | 0% | $11,294,160 |
| BANC FUNDS CO LLC | 7.2% | 530,941 | +26% | 2.2% | $11,786,890 |
| Fourthstone LLC | 5.2% | 384,802 | -50% | 1.4% | $8,542,604 |
| WELLINGTON MANAGEMENT GROUP LLP | 4.8% | 352,706 | -1.9% | 0% | $7,830,073 |
| BlackRock, Inc. | 4.7% | 347,608 | -0.78% | 0% | $7,716,897 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.1% | 301,487 | 0% | 0% | $6,693,011 |
| FIRST MANHATTAN CO. LLC. | 2.5% | 188,108 | 0% | 0.01% | $4,175,998 |
| DIMENSIONAL FUND ADVISORS LP | 2.3% | 166,633 | +20% | 0% | $3,699,046 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 147,168 | -1.9% | 0% | $3,267,520 |
| ACADIAN ASSET MANAGEMENT LLC | 1.8% | 133,976 | +38% | 0% | $2,970,000 |
| UBS Group AG | 1.5% | 113,178 | -0.44% | 0% | $2,512,551 |
| MARSHALL WACE, LLP | 1.4% | 106,225 | +140% | 0% | $2,358,194 |
| STATE STREET CORP | 1.4% | 100,211 | +36% | 0% | $2,224,684 |
| Cresset Asset Management, LLC | 0.97% | 72,000 | -78% | 0.01% | $1,598,406 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.86% | 63,776 | +5% | 0.03% | $1,415,827 |
| AMERICAN CENTURY COMPANIES INC | 0.71% | 52,544 | 0% | $1,166,477 | |
| Squarepoint Ops LLC | 0.69% | 50,874 | +48% | 0% | $1,129,403 |
| MENDON CAPITAL ADVISORS CORP | 0.64% | 47,312 | 0% | 0.41% | $1,050,326 |
| NORTHERN TRUST CORP | 0.63% | 46,935 | -3.2% | 0% | $1,041,957 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.54% | 39,661 | 0% | 0% | $880,474 |
| VANGUARD FIDUCIARY TRUST CO | 0.53% | 38,951 | 0% | 0% | $864,712 |
| Empowered Funds, LLC | 0.47% | 34,396 | +9.7% | 0% | $763,591 |
| Connor, Clark & Lunn Investment Management Ltd. | 0.45% | 33,056 | +23% | 0% | $733,843 |
| MORGAN STANLEY | 0.33% | 24,380 | -7.9% | 0% | $541,236 |
| CITADEL ADVISORS LLC | 0.32% | 23,518 | -40% | 0% | $522,100 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
40
Latest
Q1 2026
Rows shown
1-25 of 40
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 4,239,174 | $93,089,993 | -$11,138,966 | $22.20 | 83 |
| 2025 Q4 | 4,749,321 | $96,690,484 | +$2,856,828 | $20.36 | 75 |
| 2025 Q3 | 4,589,305 | $95,527,235 | +$6,799,595 | $20.83 | 70 |
| 2025 Q2 | 4,266,844 | $80,648,091 | +$11,262,860 | $18.90 | 61 |
| 2025 Q1 | 3,702,538 | $61,907,545 | -$1,509,419 | $16.72 | 51 |
| 2024 Q4 | 3,789,817 | $68,594,548 | +$324,810 | $18.10 | 53 |
| 2024 Q3 | 3,770,610 | $69,566,920 | -$3,460,316 | $18.45 | 53 |
| 2024 Q2 | 3,935,503 | $69,774,685 | -$5,599,884 | $17.73 | 65 |
| 2024 Q1 | 4,265,818 | $77,464,108 | +$1,680,327 | $18.16 | 61 |
| 2023 Q4 | 4,191,299 | $103,968,287 | +$7,613,844 | $24.81 | 63 |
| 2023 Q3 | 3,850,135 | $79,080,643 | +$2,043,343 | $20.54 | 61 |
| 2023 Q2 | 3,773,569 | $85,505,904 | +$8,661,430 | $22.66 | 59 |
| 2023 Q1 | 3,348,821 | $78,657,624 | -$1,161,875 | $23.49 | 53 |
| 2022 Q4 | 3,365,456 | $92,509,925 | +$3,713,035 | $27.49 | 52 |
| 2022 Q3 | 3,268,472 | $74,553,000 | -$1,717,446 | $22.81 | 43 |
| 2022 Q2 | 3,343,443 | $76,134,000 | -$709,864 | $22.77 | 44 |
| 2022 Q1 | 3,407,056 | $82,826,000 | -$861,529 | $24.31 | 43 |
| 2021 Q4 | 3,442,262 | $84,642,402 | +$7,120,673 | $24.59 | 45 |
| 2021 Q3 | 3,130,073 | $75,087,367 | -$2,560,816 | $23.99 | 39 |
| 2021 Q2 | 3,246,224 | $73,315,274 | -$7,121,400 | $22.58 | 44 |
| 2021 Q1 | 3,572,641 | $74,174,695 | +$528,042 | $20.76 | 49 |
| 2020 Q4 | 3,546,723 | $59,974,987 | -$7,707,353 | $16.91 | 50 |
| 2020 Q3 | 4,016,842 | $49,165,743 | +$574,997 | $12.24 | 51 |
| 2020 Q2 | 3,969,416 | $52,389,462 | -$1,123,471 | $13.20 | 50 |
| 2020 Q1 | 4,019,993 | $67,369,637 | -$2,775,410 | $16.76 | 46 |