NB Bancorp Ownership | Who Owns NB Bancorp?

NB Bancorp Ownership Summary

NB Bancorp is owned by 10.69% institutional investors, 11.76% insiders, and 77.55% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 7.59% of NBBK shares.

NBBK Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	NB Bancorp	10.69%	11.76%	77.55%
Sector	Financial Services Stocks	32.19%	15.44%	52.37%
Industry	Regional Banks Stocks	31.54%	12.70%	55.76%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	3.10M	7.59%	$61.52M
Pertento partners llp	2.11M	5.69%	$37.32M
Vanguard group	2.30M	5.63%	$45.61M
Wellington management group llp	1.83M	4.91%	$32.25M
State street	1.20M	3.22%	$21.13M
Geode capital management	966.66K	2.37%	$19.16M
Hotchkis & wiley capital management	694.98K	1.87%	$12.27M
Altravue capital	693.00K	1.70%	$13.74M
Goldman sachs group	593.89K	1.45%	$11.77M
Tieton capital management	524.93K	1.28%	$10.40M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Pertento partners llp	2.11M	4.33%	$37.32M
Tieton capital management	524.93K	3.56%	$10.40M
Ejf capital	172.80K	1.77%	$3.05M
Altravue capital	693.00K	1.13%	$13.74M
Oppenheimer & close	83.00K	1.12%	$1.65M
Stilwell value	65.00K	0.71%	$1.29M
Raffles associates lp	31.14K	0.51%	$549.55K
Legato capital management	171.36K	0.29%	$3.40M
Four tree island advisory	21.46K	0.23%	$425.26K
Lynch & associates/in	54.33K	0.20%	$1.08M

Top Buyers

Holder	Shares	% Assets	Change
Altravue capital	693.00K	1.13%	693.00K
Tieton capital management	524.93K	3.56%	524.93K
Vanguard group	2.30M	0.00%	350.90K
Dimensional fund advisors lp	288.03K	0.00%	288.03K
Blackrock funding, inc. /de	3.10M	0.00%	281.64K

Top Sellers

Holder	Shares	% Assets	Change
Ubs group	146.09K	0.00%	-232.26K
Stieven capital advisors	-	-	-197.04K
Endeavour capital advisors	-	-	-164.18K
Prospector partners	-	-	-150.86K
Jpmorgan chase	59.21K	0.00%	-60.47K

New Positions

Holder	Shares	% Assets	Change	Value
Altravue capital	693.00K	1.13%	693.00K	$13.74M
Tieton capital management	524.93K	3.56%	524.93K	$10.40M
Dimensional fund advisors lp	288.03K	0.00%	288.03K	$5.71M
Legato capital management	171.36K	0.29%	171.36K	$3.40M
Bridgeway capital management	114.81K	0.04%	114.81K	$2.03M

Sold Out

Holder	Change
Us bancorp \de\	-13.00
Stephens consulting	-20.00
Parkside financial bank & trust	-25.00
Signaturefd	-34.00
Coldstream capital management	-82.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	49	-66.44%	4,367,549	-77.24%	10	0.40%	27	-62.50%	9	-79.55%
Sep 30, 2025	43	-67.18%	3,461,700	-81.51%	9	0.37%	14	-78.13%	13	-71.11%
Jun 30, 2025	131	5.65%	18,717,658	2.03%	50	2.25%	64	8.47%	45	25.00%
Mar 31, 2025	124	6.90%	18,345,847	7.73%	47	2.52%	59	11.32%	36	9.09%
Dec 31, 2024	119	5.31%	18,099,616	-4.37%	46	1.99%	54	-19.40%	34	47.83%

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 06, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$62.31K
Mar 06, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$41.56K
Mar 09, 2026	Lapointe Jean-Pierre	SEVP and CFO	Buy	$20.42K
Jan 24, 2025	Elliott Mary Susan	-	Buy	$187.20K
May 02, 2025	Elliott Mary Susan	-	Buy	$30.67K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	3	-
2025 Q4	2	-
2025 Q3	4	-
2025 Q2	6	-
2025 Q1	4	-

NBBK Ownership FAQ

Who Owns NB Bancorp?

NB Bancorp shareholders are primarily institutional investors at 10.69%, followed by 11.76% insiders and 77.55% retail investors. The average institutional ownership in NB Bancorp's industry, Regional Banks Stocks, is 31.54%, which NB Bancorp falls below.

Who owns the most shares of NB Bancorp?

NB Bancorp’s largest shareholders are Blackrock funding, inc. /de (3.1M shares, 7.59%), Pertento partners llp (2.11M shares, 5.69%), and Vanguard group (2.3M shares, 5.63%). Together, they hold 18.91% of NB Bancorp’s total shares outstanding.

Does Blackrock own NB Bancorp?

BlackRock is not among the top 10 institutional shareholders of NB Bancorp.

Who is NB Bancorp’s biggest shareholder by percentage of total assets invested?

Pertento partners llp is NB Bancorp’s biggest shareholder by percentage of total assets invested, with 4.33% of its assets in 2.11M NB Bancorp shares, valued at 37.32M$.

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