NB Bancorp Ownership | Who Owns NB Bancorp?

NB Bancorp Ownership Summary

NB Bancorp is owned by 55.58% institutional investors, 12.52% insiders, and 31.89% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 8.13% of NBBK shares. Vanguard Morn Total Stk Mkt Idx Investor is the top mutual fund, with 2.72% of its assets in NB Bancorp shares.

NBBK Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	NB Bancorp	55.58%	12.52%	31.89%
Sector	Financial Services Stocks	493.55%	13.79%	-407.34%
Industry	Regional Banks Stocks	56.79%	12.57%	30.64%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	3.33M	8.13%	$70.40M
Vanguard group	2.30M	5.63%	$45.61M
Vanguard capital management	1.67M	4.08%	$35.30M
Altravue capital	1.66M	4.04%	$34.97M
Pertento partners llp	1.48M	3.60%	$31.18M
State street	1.47M	3.59%	$31.10M
Geode capital management	1.15M	2.81%	$24.37M
Dimensional fund advisors lp	753.32K	1.84%	$15.92M
Goldman sachs group	571.95K	1.40%	$12.09M
Tieton capital management	546.60K	1.33%	$11.55M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Tieton capital management	546.60K	3.32%	$11.55M
Altravue capital	1.66M	2.52%	$34.97M
Pertento partners llp	1.48M	1.68%	$31.18M
Oppenheimer & close	83.00K	1.11%	$1.75M
Legato capital management	366.09K	0.64%	$7.74M
Raffles associates lp	31.87K	0.61%	$673.50K
Stilwell value	50.00K	0.61%	$1.06M
Ejf capital	40.75K	0.58%	$861.07K
Afg fiduciary services limited partnership	12.49K	0.21%	$264.10K
Lynch & associates/in	50.33K	0.19%	$1.06M

Top Buyers

Holder	Shares	% Assets	Change
Altravue capital	1.66M	2.52%	351.03K
Vanguard group	2.30M	0.00%	350.90K
Sixth street partners management company	318.61K	0.00%	318.61K
Blackrock funding, inc. /de	3.33M	0.00%	247.32K
Dimensional fund advisors lp	753.32K	0.00%	230.94K

Top Sellers

Holder	Shares	% Assets	Change
Pertento partners llp	1.48M	1.68%	-730.90K
Wellington management group llp	-	-	-710.00K
Stieven capital advisors	-	-	-197.04K
Endeavour capital advisors	-	-	-164.18K
Sei investments	142.35K	0.00%	-159.84K

New Positions

Holder	Shares	% Assets	Change	Value
Sixth street partners management company	318.61K	0.00%	318.61K	$6.73M
Trexquant investment lp	46.31K	0.01%	46.31K	$978.57K
Brandywine global investment management	27.47K	0.00%	27.47K	$544.46K
Mirabella financial services llp	20.23K	0.04%	20.23K	$427.40K
Tudor investment corp et al	13.17K	0.00%	13.17K	$232.43K

Sold Out

Holder	Change
Hughes financial services	-1.00
Versant capital management	-15.00
Stephens consulting	-20.00
Parkside financial bank & trust	-25.00
Quadrant capital group	-57.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	163	-9.44%	22,772,475	-1.36%	55	1.74%	81	-16.49%	49	8.89%
Mar 31, 2026	175	5.42%	22,927,306	2.94%	56	1.89%	94	-15.32%	44	22.22%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Morn Total Stk Mkt Idx Investor	1.19M	2.72%	-121.00K
Vanguard MStar Total Stk Mkt Idx Invest	1.19M	2.72%	-
Vanguard Total Stock Mkt Idx Inv	1.19M	2.72%	-121.00K
iShares Russell 2000 ETF	1.05M	2.39%	-18.62K
Tieton Small Cap Value	546.60K	1.25%	-6.97K
Vanguard Institutional Extnd Mkt Idx Tr	441.22K	1.01%	1.09K
CREF Total Global Stock Account R3	440.20K	1.00%	-50.44K
State Street® SPDR® S&PRgnllBkgETF	414.02K	0.94%	-22.20K
Fidelity Enhanced Small Cap Core ETF	410.24K	0.94%	1.58K
Fidelity Small Cap Index	394.86K	0.90%	2.94K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 20, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$43.50K
Aug 20, 2026	Lapointe Jean-Pierre	SEVP and CFO	Buy	$4.36K
Aug 14, 2026	Henkin Kevin	EVP, Chief Credit Officer	Sell	$45.86K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$9.60K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$1.92K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	2	1
2026 Q2	18	-
2026 Q1	4	-
2025 Q4	2	-
2025 Q3	4	-

NBBK Ownership FAQ

Who Owns NB Bancorp?

NB Bancorp shareholders are primarily institutional investors at 55.58%, followed by 12.52% insiders and 31.90% retail investors. The average institutional ownership in NB Bancorp's industry, Regional Banks Stocks, is 56.79%, which NB Bancorp falls below.

Who owns the most shares of NB Bancorp?

NB Bancorp’s largest shareholders are Blackrock funding, inc. /de (3.33M shares, 8.13%), Vanguard group (2.3M shares, 5.63%), and Vanguard capital management (1.67M shares, 4.08%). Together, they hold 17.84% 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?

Tieton capital management is NB Bancorp’s biggest shareholder by percentage of total assets invested, with 3.32% of its assets in 546.6K NB Bancorp shares, valued at 11.55M$.

Who is the top mutual fund holder of NB Bancorp shares?

Vanguard Morn Total Stk Mkt Idx Investor is the top mutual fund holder of NB Bancorp shares, with 2.72% of its total shares outstanding invested in 1.19M NB Bancorp shares.

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