NB Bancorp NBBK Institutional Ownership

NASDAQ NBBK

$22.88 -0.12 (-0.50%)

As of: Sep 9, 2026 · 3:59 PM EDT

Institutions by Trading Activity

159 Institutions

Increased 79 49.7%

Unchanged 31 19.5%

Reduced 49 30.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

50.85%

▲+0.51 pp QoQ

Shares Held by Institutions

22.45Mn

of 44.14Mn outstanding

▲+3.98% QoQ

Shares Outstanding

44.14Mn

21.70Mn held outside 13F filers

Institutional Investors

159

filed 13F for Jun 2026

▼-16 vs prior quarter

Net Shares Added (QoQ)

+858.70K

accumulated since last quarter

Value of Holdings

$519.84Mn

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

NB Bancorp, Inc. (NASDAQ:NBBK) has 159 institutional investors that have filed 13F reports for the period ending June 2026.

These investors held 50.8% of outstanding shares in June 2026, up from 50.3% in March 2026.
They increased total shares held in NB Bancorp by 3.98% from last quarter, and the number of investors in NBBK increased 22.31% annually.
Among the 159 funds, 79 bought more NB Bancorp shares, 49 sold down, and 31 held their ground.
In total, institutional investors held 22.45Mn shares in NB Bancorp as of June 2026, up by 858.7K shares quarter on quarter, and up 3.68Mn shares year over year.
As of June 30, 2026, the biggest holder of NB Bancorp is BlackRock, Inc. at 3.33Mn shares, representing 7.55% of shares outstanding.
The largest buyers of NB Bancorp for the quarter ending June 2026 were AltraVue Capital, LLC (351.03K), Sixth Street Partners Management Company, L.P. (318.61K), BlackRock, Inc. (247.32K), DIMENSIONAL FUND ADVISORS LP (230.94K), State Street Corp (178.23K).
The largest sales of NBBK for the quarter ending June 2026 came from Pertento Partners LLP (730.9K), Sei Investments Co (159.84K), RENAISSANCE TECHNOLOGIES LLC (132.47K), Goldman Sachs Group Inc (119.71K), TWO SIGMA INVESTMENTS, LP (94.78K).
Per Business Quant, the top 10 investors in NBBK for the quarter ending June 2026 include BlackRock, Inc. (3.33Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.67Mn), AltraVue Capital, LLC (1.66Mn), Pertento Partners LLP (1.48Mn), State Street Corp (1.47Mn), GEODE CAPITAL MANAGEMENT, LLC (1.15Mn), DIMENSIONAL FUND ADVISORS LP (753.32K), Goldman Sachs Group Inc (571.95K), Tieton Capital Management, LLC (546.6K), HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC (501.17K).

Form 13F Holdings

159 Institutional Holders

Report period 30 Jun, 2026

Total shares held 22.45Mn

Of outstanding 50.85%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	3,331,544	7.55%	▲247,322	+8.02%	$70.40Mn
2	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,670,835	3.78%	▼33,093	-1.94%	$35.30Mn
3	AltraVue Capital, LLC	0001740837	1,655,108	3.75%	▲351,028	+26.92%	$34.97Mn
4	Pertento Partners LLP	0001894571	1,475,770	3.34%	▼730,896	-33.12%	$31.18Mn
5	State Street Corp	0000093751	1,471,766	3.33%	▲178,228	+13.78%	$31.10Mn
6	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,153,217	2.61%	▲54,287	+4.94%	$24.37Mn
7	DIMENSIONAL FUND ADVISORS LP	0000354204	753,320	1.71%	▲230,936	+44.21%	$15.92Mn
8	Goldman Sachs Group Inc	0000886982	571,954	1.30%	▼119,714	-17.31%	$12.09Mn
9	Tieton Capital Management, LLC	0001381954	546,600	1.24%	▼6,970	-1.26%	$11.55K
10	HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC	0001164833	501,172	1.14%	▲50,400	+11.18%	$10.59Mn
11	Nuveen, LLC	0001871926	498,869	1.13%	▲10,836	+2.22%	$10.54Mn
12	FMR LLC	0000315066	497,305	1.13%	▲59,580	+13.61%	$10.51Mn
13	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	397,046	0.90%	▲10,914	+2.83%	$8.39Mn
14	Northern Trust Corp	0000073124	360,492	0.82%	▲25,132	+7.49%	$7.62Mn
15	NEW YORK STATE COMMON RETIREMENT FUND	0000810265	346,155	0.78%	▲85,570	+32.84%	$7.31Mn
16	Sixth Street Partners Management Company, L.P.	0001812095	318,612	0.72%	▲318,612	0.00%	$6.73Mn
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	318,612	0.72%	▲247	+0.08%	$6.73Mn
17	CITADEL ADVISORS LLC	0001423053	289,814	0.66%	▲173,443	+149.04%	$6.12Mn
18	TWO SIGMA INVESTMENTS, LP	0001179392	277,027	0.63%	▼94,780	-25.49%	$5.85Mn
19	AMERICAN CENTURY COMPANIES INC	0000748054	261,866	0.59%	▼1,790	-0.68%	$5.53Mn

Showing 1 to 20 of 159 holders