$NBBK

$22.63 +$0.00 (0.0%) After hours

$NBBK Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 43.8M shares outstanding

Who owns NBBK?

By type of holder

Institutions 50.4% Insiders 5.3% Everyone else 44.3%

Concentration Top 10 holders own 30.0%

BlackRock, Inc. 7.6% · Pertento Partners LLP 3.4%

Institutional ownership

50.4%

-1.6 pts vs last qtr

Institutional holders

159

-17 vs last qtr

Net shares bought

−714.1K

by institutions in Q2 2026

New / sold out

13 / 30

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

AltraVue Capital, LLC +351.0K
BlackRock, Inc. +247.3K

Biggest sellers in Q2 2026

Pertento Partners LLP −730.9K
Wellington Management Group LLP SOLD OUT −710.0K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for NB Bancorp Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

−10.5%

−5.37% a year

Each share's claim on the business

+11.7%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$77.1M vs $2.91M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years80% Under 1 year20%

Quarterly turnover

11.3%

of institutional shares changed hands

Top 10 managers, median time held

2.3 years

Super Investors

Investment managers reporting NBBK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	3.3M	7.60%	+247.3K (+8.0%)	2024	0.0%
Shares held by quarter Peak holding3.3M (Q2'26) Change over 8 quarters+35.6K Share of the company7.600% BlackRock, Inc.'s full portfolio →
PP Pertento Partners LLP	1.5M	3.37%	−730.9K (−33.1%)	2024	1.7%
Shares held by quarter Peak holding2.4M (Q3'24) Change over 8 quarters−880.0K Share of the company3.370% Pertento Partners LLP's full portfolio →

BlackRock, Inc.

3.3M

% of company

7.60%

Change vs last qtr

+247.3K (+8.0%)

Held since

2024

Pertento Partners LLP

1.5M

% of company

3.37%

Change vs last qtr

−730.9K (−33.1%)

Held since

2024

28 more super investors behind a free account

See every manager holding NB Bancorp Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting NBBK on Form N-PORT; together they hold 21.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$25.2M	1.2M	2.72%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$22.6M	1.1M	2.44%	0.03%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$25.2M

% of company

2.72%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$22.6M

% of company

2.44%

% of the fund

0.03%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding NB Bancorp Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
CJ Campanelli Joseph P Insider	484.7K	1.11%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.110% Campanelli Joseph P's insider activity →
PH Pascucci Hope Insider	222.4K	0.51%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.510% Pascucci Hope's insider activity →

Campanelli Joseph P

Insider

484.7K

% of company

1.11%

Change vs last qtr

—

Held since

—

Pascucci Hope

Insider

222.4K

% of company

0.51%

Change vs last qtr

—

Held since

—

21 more holders behind a free account

See every insider and 5%+ holder of NB Bancorp Inc.

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