NB Bancorp Ownership | Who Owns NB Bancorp?

NB Bancorp Ownership Summary

NB Bancorp is owned by 56.10% institutional investors, 12.24% insiders, and 31.66% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 7.55% of NBBK shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.75% of its assets in NB Bancorp shares.

NBBK Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	NB Bancorp	56.10%	12.24%	31.66%
Sector	Financial Services Stocks	37.05%	15.59%	47.36%
Industry	Regional Banks Stocks	38.44%	12.57%	48.99%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	3.08M	7.55%	$64.98M
Vanguard group	2.30M	5.63%	$45.61M
Pertento partners llp	2.21M	5.40%	$46.49M
Altravue capital	1.30M	3.19%	$27.48M
State street	1.29M	3.16%	$27.25M
Geode capital management	1.10M	2.69%	$23.16M
Wellington management group llp	710.00K	1.74%	$14.96M
Goldman sachs group	691.67K	1.69%	$14.57M
Tieton capital management	553.57K	1.35%	$11.66M
Dimensional fund advisors lp	522.38K	1.28%	$11.01M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Tieton capital management	553.57K	3.91%	$11.66M
Pertento partners llp	2.21M	3.40%	$46.49M
Altravue capital	1.30M	2.37%	$27.48M
Oppenheimer & close	83.00K	1.10%	$1.75M
Stilwell value	65.00K	0.82%	$1.37M
Ejf capital	41.46K	0.62%	$873.50K
Legato capital management	276.07K	0.53%	$5.82M
Raffles associates lp	14.87K	0.27%	$313.39K
Four tree island advisory	25.01K	0.27%	$526.98K
Round rock advisors	66.47K	0.21%	$1.40M

Top Buyers

Holder	Shares	% Assets	Change
Altravue capital	1.30M	2.37%	611.08K
Vanguard group	2.30M	0.00%	350.90K
Vanguard fiduciary trust	254.04K	0.00%	254.04K
Dimensional fund advisors lp	522.38K	0.00%	234.36K
State street	1.29M	0.00%	179.16K

Top Sellers

Holder	Shares	% Assets	Change
Wellington management group llp	710.00K	0.00%	-761.19K
Marshall wace, llp	-	-	-251.51K
Hotchkis & wiley capital management	450.77K	0.03%	-251.22K
Stieven capital advisors	-	-	-197.04K
Endeavour capital advisors	-	-	-164.18K

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	254.04K	0.00%	254.04K	$5.35M
Credit agricole s a	70.00K	0.00%	70.00K	$1.47M
Mackenzie financial	50.90K	0.00%	50.90K	$1.07M
Wedge capital management l l p/nc	42.36K	0.02%	42.36K	$892.44K
Xtx topco	39.78K	0.01%	39.78K	$838.21K

Sold Out

Holder	Change
Stephens consulting	-20.00
Parkside financial bank & trust	-25.00
Coldstream capital management	-82.00
Traub capital management	-250.00
Sbi securities	-250.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	124	6.90%	18,345,847	7.73%	47	2.52%	59	11.32%	36	9.09%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	1.23M	2.75%	-
iShares Russell 2000 ETF	923.12K	2.06%	7.80K
Tieton Small Cap Value	553.57K	1.24%	28.64K
Vanguard Institutional Extnd Mkt Idx Tr	434.98K	0.97%	2.67K
CREF Total Global Stock Account R3	434.36K	0.97%	76.65K
Fidelity Small Cap Index	387.60K	0.87%	6.74K
State Street® SPDR® S&PRgnllBkgETF	373.83K	0.84%	-3.44K
Fidelity Enhanced Small Cap Core ETF	354.23K	0.79%	-4.11K
iShares Russell 2000 Value ETF	338.45K	0.76%	1.83K
State St Russell Sm/Mid Cp® Indx SL Cl I	248.45K	0.56%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$4.86K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$9.60K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$4.74K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$1.92K
May 15, 2026	CAMPANELLI JOSEPH P	President & CEO	Buy	$14.71K

Insider Transactions Trends

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

NBBK Ownership FAQ

Who Owns NB Bancorp?

NB Bancorp shareholders are primarily institutional investors at 56.10%, followed by 12.24% insiders and 31.66% retail investors. The average institutional ownership in NB Bancorp's industry, Regional Banks Stocks, is 38.44%, which NB Bancorp exceeds.

Who owns the most shares of NB Bancorp?

NB Bancorp’s largest shareholders are Blackrock funding, inc. /de (3.08M shares, 7.55%), Vanguard group (2.3M shares, 5.63%), and Pertento partners llp (2.21M shares, 5.40%). Together, they hold 18.58% 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 3.91% of its assets in 553.57K NB Bancorp shares, valued at 11.66M$.

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

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of NB Bancorp shares, with 2.75% of its total shares outstanding invested in 1.23M NB Bancorp shares.

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