NB Bancorp

NBBK · NASDAQ

$22.32+$0.83 (+3.86%)TodayMarket closed · Oct 20, 7:30 PM ET

Prev close $21.49

Who owns NBBK

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 35.3% of NBBK’s shares.

Needham Bank ESOP7.6%
BlackRock Institutional Trust Company, N.A.6.6%
Vanguard Capital Management, LLC3.8%
AltraVue Capital, LLC.3.8%
Next 6 largest institutions13.5%
All other shareholders64.7%

Top institutional holders of NBBK
Holder	Shares	% of shares	Change, last filing	Filed
Needham Bank ESOP	3.34M	7.62%	−76.70K	Mar 6, 2026
BlackRock Institutional Trust Company, N.A.	2.91M	6.65%	+259.24K	Jun 30, 2026
Vanguard Capital Management, LLC	1.67M	3.81%	−33.09K	Jun 30, 2026
AltraVue Capital, LLC.	1.66M	3.78%	+351.03K	Jun 30, 2026
Pertento Partners LLP	1.48M	3.37%	−730.90K	Jun 30, 2026
State Street Investment Management (US)	1.47M	3.36%	+178.23K	Jun 30, 2026
Geode Capital Management, L.L.C.	1.15M	2.63%	+54.29K	Jun 30, 2026
Dimensional Fund Advisors, L.P.	753.32K	1.72%	+230.94K	Jun 30, 2026
Tieton Capital Management, LLC	546.60K	1.25%	−6.97K	Jun 30, 2026
Hotchkis and Wiley Capital Management, LLC	501.17K	1.14%	+50.40K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of NBBK
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Total Stock Market Index Fund	1.19M	2.72%	+0	Jul 31, 2026
iShares Russell 2000 ETF	1.07M	2.43%	−4.66K	Jul 31, 2026
Vanguard Extended Market Index Fund	441.22K	1.01%	+1.09K	Jul 31, 2026
CREF Total Global Stock Account	440.20K	1.00%	+0	Jul 31, 2026
Fidelity Small Cap Index Fund	437.87K	1.00%	+43.02K	Jun 30, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders bought $543.31K (20 trades) and sold $45.86K (1 trade) of NBBK on the open market.

Latest NBBK insider transactions
Insider	Date	Type	Shares	Price	Value
Lapointe Jean-Pierre	Aug 20, 2026	Buy	200	$21.80	$4.36K
CAMPANELLI JOSEPH P	Aug 20, 2026	Buy	2.00K	$21.75	$43.50K
Henkin Kevin	Aug 14, 2026	Sale	2.00K	$22.93	$45.86K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	247	$19.21	$4.74K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	100	$19.20	$1.92K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	253	$19.20	$4.86K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	500	$19.19	$9.60K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	767	$19.18	$14.71K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	100	$19.18	$1.92K
CAMPANELLI JOSEPH P	May 15, 2026	Buy	400	$19.17	$7.67K

Short interest

Settled Sep 30, 2026

Shares short: 1.81M
Days to cover: 6.48
% of shares outstanding: 4.12%
Average daily volume: 278.69K
Change since last report: +7.3%

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