# MainStreet Bancshares, Inc. Common Stock

MainStreet Bancshares, Inc. Common Stock is a security (CUSIP 56064Y100) tracked across SEC portfolio filings. 87 institutional managers reported $90.5M on Form 13F as of 2026-06-30; 8 registered fund positions totaling $2.9M via N-PORT as of 2026-05-31.

## Summary

- Issuer: MainStreet Bancshares, Inc.
- Class: Common Stock
- CUSIP: 56064Y100
- Asset category: EC
- 13F holders: 87
- 13F value: $90.5M
- 13F period: 2026-06-30
- N-PORT fund positions: 8
- N-PORT value: $2.9M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 87 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BANC FUNDS CO LLC | CHICAGO, IL | $11.8M | 530,941 |
| [ALLIANCEBERNSTEIN L.P.](https://search.stillhousedata.com/firm/108477) | NASHVILLE, TN | $11.3M | 554,723 |
| Fourthstone LLC | ST LOUIS, MO | $8.5M | 384,802 |
| WELLINGTON MANAGEMENT GROUP LLP | BOSTON, MA | $7.8M | 352,706 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $7.7M | 379,278 |
| BlackRock, Inc. | New York, NY | $7.7M | 347,608 |
| [FIRST MANHATTAN CO. LLC.](https://search.stillhousedata.com/firm/325281) | New York, NY | $4.2M | 188,108 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $3.7M | 166,633 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $3.3M | 147,168 |
| UBS Group AG | Zurich, V8 | $2.5M | 113,178 |
| [MARSHALL WACE, LLP](https://search.stillhousedata.com/firm/160885) | LONDON, X0 | $2.4M | 106,225 |
| STATE STREET CORP | BOSTON, MA | $2.2M | 100,211 |
| [Cresset Asset Management, LLC](https://search.stillhousedata.com/firm/288566) | Chicago, IL | $1.6M | 72,000 |
| [BRIDGEWAY CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/111441) | HOUSTON, TX | $1.4M | 63,776 |
| AMERICAN CENTURY COMPANIES INC | KANSAS CITY, MO | $1.2M | 52,544 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $1.4M | 0.17% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $800K | 0.46% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $271K | 0.56% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $205K | 0.27% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $102K | 0.03% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $82K | 0.01% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $21K | 0.49% |
| [Longview Advantage ETF](https://search.stillhousedata.com/fund/S000086399) | RBB Fund Trust | $10K | 0.16% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/56064Y100.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.