MainStreet Bancshares MNSB Institutional Ownership

NASDAQ MNSB

$25.44 -0.17 (-0.66%)

As of: Sep 9, 2026 · 3:59 PM EDT

Institutions by Trading Activity

97 Institutions

Increased 61 62.9%

Unchanged 16 16.5%

Reduced 20 20.6%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

56.78%

▲+0.50 pp QoQ

Shares Held by Institutions

4.07Mn

of 7.18Mn outstanding

▼-3.22% QoQ

Shares Outstanding

7.18Mn

3.10Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+15 vs prior quarter

Net Shares Added (QoQ)

-135.38K

distributed since last quarter

Value of Holdings

$103.67Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

MainStreet Bancshares, Inc. (NASDAQ:MNSB) showed up in the 13F filings of 97 institutional investors as of June 2026.

These investors held 56.8% of outstanding shares in June 2026, up from 56.3% in March 2026.
They decreased total shares held in MainStreet Bancshares by -3.22% from the prior quarter, while the number of investors in MNSB increased 64.41% year over year.
Activity in MNSB broke down as 61 buyers, 20 sellers, and 16 unchanged among 97 total holders.
In total, institutional investors held 4.07Mn shares in MainStreet Bancshares as of June 2026, down by 135.38K shares quarter on quarter, and down 548.15K shares year over year.
BANC FUNDS CO LLC leads ownership in MNSB with 545.68K shares as of June 30, 2026, equal to 7.6% of outstanding shares.
The largest buyers of MainStreet Bancshares for the quarter ending June 2026 were BlackRock, Inc. (56.43K), ACADIAN ASSET MANAGEMENT LLC (49.27K), AMERICAN CENTURY COMPANIES INC (49.06K), DIMENSIONAL FUND ADVISORS LP (38.38K), CITADEL ADVISORS LLC (34.83K).
The biggest sellers of MainStreet Bancshares for the quarter ending June 2026 included Fourthstone LLC (337.37K), ALLIANCEBERNSTEIN L.P. (136.33K), UBS Group AG (80.08K), VANGUARD CAPITAL MANAGEMENT LLC (39.02K), FIRST MANHATTAN CO. LLC. (26.38K).
According to Business Quant data, leading holders of MNSB for June 2026 are BANC FUNDS CO LLC (545.68K), ALLIANCEBERNSTEIN L.P. (418.39K), BlackRock, Inc. (404.04K), WELLINGTON MANAGEMENT GROUP LLP (336.96K), VANGUARD CAPITAL MANAGEMENT LLC (262.47K), DIMENSIONAL FUND ADVISORS LP (205.01K), ACADIAN ASSET MANAGEMENT LLC (183.24K), FIRST MANHATTAN CO. LLC. (161.73K), GEODE CAPITAL MANAGEMENT, LLC (152.2K), MARSHALL WACE, LLP (120.19K).

Form 13F Holdings

97 Institutional Holders

Report period 30 Jun, 2026

Total shares held 4.07Mn

Of outstanding 56.78%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BANC FUNDS CO LLC	0001029311	545,679	7.60%	▲14,738	+2.78%	$13.47Mn
2	ALLIANCEBERNSTEIN L.P.	0001109448	418,393	5.83%	▼136,330	-24.58%	$9.29Mn
3	BlackRock, Inc.	0002012383	404,037	5.63%	▲56,429	+16.23%	$9.98Mn
4	WELLINGTON MANAGEMENT GROUP LLP	0000902219	336,961	4.69%	▼15,745	-4.46%	$8.32Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	262,466	3.66%	▼39,021	-12.94%	$6.48Mn
6	DIMENSIONAL FUND ADVISORS LP	0000354204	205,014	2.86%	▲38,381	+23.03%	$5.06Mn
7	ACADIAN ASSET MANAGEMENT LLC	0000916542	183,245	2.55%	▲49,269	+36.77%	$4.52K
8	FIRST MANHATTAN CO. LLC.	0000728083	161,731	2.25%	▼26,377	-14.02%	$3.99Mn
9	GEODE CAPITAL MANAGEMENT, LLC	0001214717	152,196	2.12%	▲5,028	+3.42%	$3.76Mn
10	MARSHALL WACE, LLP	0001318757	120,194	1.67%	▲13,969	+13.15%	$2.97Mn
11	State Street Corp	0000093751	109,465	1.53%	▲9,254	+9.23%	$2.70Mn
12	AMERICAN CENTURY COMPANIES INC	0000748054	101,604	1.42%	▲49,060	+93.37%	$2.51Mn
13	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	66,551	0.93%	▲2,775	+4.35%	$1.64Mn
14	Cresset Asset Management, LLC	0001761013	59,040	0.82%	▼12,960	-18.00%	$1.46Mn
15	CITADEL ADVISORS LLC	0001423053	58,344	0.81%	▲34,826	+148.08%	$1.44Mn
16	Northern Trust Corp	0000073124	48,150	0.67%	▲1,215	+2.59%	$1.19Mn
17	Fourthstone LLC	0001767803	47,432	0.66%	▼337,370	-87.67%	$1.19Mn
18	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	42,813	0.60%	▲3,152	+7.95%	$1.06Mn
19	Trexquant Investment LP	0001633445	39,525	0.55%	▲22,486	+131.97%	$975.87K
20	VANGUARD FIDUCIARY TRUST CO	0000933478	39,018	0.54%	▲67	+0.17%	$963.35K

Showing 1 to 20 of 97 holders