MainStreet Bancshares, Inc. - Common Stock, par value $4.00 per share (MNSB)

Q: What does CUSIP 56064Y100 represent in this 13F holders report?

CUSIP 56064Y100 is the security identifier for MNSB - MainStreet Bancshares, Inc. - Common Stock, par value $4.00 per share used to aggregate holder disclosures.

Q: How many institutions held MNSB - MainStreet Bancshares, Inc. - Common Stock, par value $4.00 per share in Q1 2026?

84 institutional investors reported MNSB - MainStreet Bancshares, Inc. - Common Stock, par value $4.00 per share for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 56064Y100

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Common Stock, par value $4.00 per share
Total 13F shares: 4,239,188
Total 13F value: $93,090,304
Share change: -514,594
SEC-reported price per share: $22.20
Number of holders: 84
Value change: -$11,138,655
Number of buys: 35
Number of sells: 28
Shares outstanding: 7,079,403

Security key

56064Y100

Report period

Q1 2026

Institutions

Top holders

MNSB full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 MainStreet Bancshares, Inc. SEC filings MainStreet Bancshares, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 56064Y100

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of MNSB - MainStreet Bancshares, Inc. - Common Stock, par value $4.00 per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

MainStreet Bank 401(k) Re...

Disclosed value leader

Fourthstone LLC

Comparable rows

15/15

Latest evidence

20 Feb 2026

13D/G 13F 3/4/5 Lead comparable stake: 5.1% 13D/G row: MainStreet Bank 401(k) Retirement Plan Showing 1-6 of 15 holder rows.

Quick read

MainStreet Bank 401(k) Retirement Plan leads the comparable SEC ownership view at 5.1%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens MainStreet Bank 401(k) Retirement Plan's linked filing trail.

Comparable ownership Top 5

MainStreet Bank 401(k) Retirement... 5.1%

WELLINGTON MANAGEMENT GROUP LLP 4.7%

Jeff W. Dick 3.8%

Charles C. Brockett 1.7%

Thomas J. Chmelik 1.7%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
MainStreet Bank 401(k) Retirement Plan	13D/G 13D/G	5.1%	$7,870,979 383,763 shares	$0	31 Dec 2025
WELLINGTON MANAGEMENT GROUP LLP	13F 13D/G Company 13F 13D/G	4.7% from 13D/G	$7,317,608 359,411 shares	—	31 Dec 2025
Jeff W. Dick	3/4/5 Chairman, President and CEO, Director 3/4/5	3.8%	$5,997,387 270,817 shares	+$5,911	20 Feb 2026
Charles C. Brockett	3/4/5 Director 3/4/5	1.7%	$2,291,787 120,797 shares	+$14,113	24 Nov 2025
Thomas J. Chmelik	3/4/5 Senior EVP, Director 3/4/5	1.7%	$2,406,030 117,756 shares	-$809,009	20 Feb 2026
Abdulhamid Hersiburane	3/4/5 President, MainSteet Bank 3/4/5	0.75%	$1,177,162 53,026 shares	—	20 Feb 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

4,239,188

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend