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NBBK · NB Bancorp, Inc. · Shareholders & Ownership

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$22.64 -0.37 (-1.61%)
Market Cap
$1.01B
Shares
43.82M
Volume · Oct 27 81.79K Avg daily vol (3M) 300.35K

Every disclosed holder of NBBK in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns NBBK

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 22,492,252 51.33%
Insiders (Forms 3, 4, 5) 2,304,826 5.26%
13D/G-only blocks 3,416,458 7.80%
Remaining 15,604,954 35.61%
Registered funds (N-PORT, not summed) 9,334,276 21.30%

Shares outstanding: 43,818,490, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of NBBK

# Holder Shares
1
Needham Bank Employee Stock Ownership Plan Trust
13G CIK 2110259 · Pension or benefit plan · Dec 31, 2025
Rule 13d-1(b), qualified institution
3,416,458
2
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,331,544
2.1
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,070,876
2.2
iShares Russell 2000 Value ETF
Fund S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
394,982
2.3
iShares Micro-Cap ETF
Fund S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
137,814
2.4
Master Small Cap Index Series
Fund S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
76,077
2.5
iShares Core S&P Total U.S. Stock Market ETF
Fund S000004317 · Registered fund · Jun 30, 2026
iShares Trust, not summed
66,704
3
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,670,835
4
AltraVue Capital, LLC
13F CIK 1740837 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,655,108
5
Pertento Partners LLP
13F CIK 1894571 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,475,770
6
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,471,766
6.1
State Street(R) SPDR(R) S&P(R) Regional Banking ETF
Fund S000012325 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
450,046
6.2
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
14,415
6.3
State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF
Fund S000036082 · Registered fund · Jun 30, 2026
SPDR INDEX SHARES FUNDS, not summed
4,716
6.4
State Street Total Return V.I.S. Fund
Fund S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
953
6.5
State Street Balanced Index Fund
Fund S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
248
7
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,191,725
8
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,153,217
9
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
753,320
9.1
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
138,936
9.2
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
128,618
9.3
Dimensional US Small Cap Value ETF
Fund S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
114,027
9.4
U.S. SMALL CAP VALUE PORTFOLIO
Fund S000000987 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
101,759
9.5
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
59,420
10
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
571,954
10.1
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
10,630
11
Tieton Capital Management, LLC
13F CIK 1381954 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
546,600
12
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC
13F CIK 1164833 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
501,172
12.1
Hotchkis and Wiley Small Cap Diversified Value Fund
Fund S000045868 · Registered fund · Jun 30, 2026
HOTCHKIS & WILEY FUNDS/DE/, not summed
131,400
13
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
498,869
13.1
College Retirement Equities Fund - Total Global Stock Account
Fund S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
440,200
13.2
Nuveen Small Cap Blend Index Fund
Fund S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
53,736
13.3
TIAA Separate Account VA-1 - Stock Index Account
Fund S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
1,273
13.4
Nuveen Life Stock Index Fund
Fund S000005094 · Registered fund · Jun 30, 2026
TIAA-CREF Life Funds, not summed
476
14
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
497,305
14.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
443,068
14.2
Fidelity Enhanced Small Cap Core ETF
Fund S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
379,380
14.3
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
188,835
14.4
VIP Disciplined Small Cap Portfolio
Fund S000007725 · Registered fund · Jun 30, 2026
Variable Insurance Products Fund II, not summed
113,619
14.5
Fidelity Small-Mid Multifactor ETF
Fund S000064786 · Registered fund · Jul 31, 2026
Fidelity Covington Trust, not summed
105,504
15
CAMPANELLI JOSEPH P
Insider CIK 1222378 · Aug 20, 2026
Director, President & CEO, issuer-wide
484,687
16
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
440,301
17
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
397,046
18
Legato Capital Management LLC
13F CIK 1442641 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
366,090
19
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
360,492
19.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
20,575
19.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
4,467
19.3
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
2,686
20
NEW YORK STATE COMMON RETIREMENT FUND
13F CIK 810265 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
346,155
21
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
318,612
21.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
178,847
21.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
98,974
21.3
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
21,592
21.4
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
19,402
22
CITADEL ADVISORS LLC
13F CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
289,814
23
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
277,027
24
AMERICAN CENTURY COMPANIES INC
13F CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
261,866
25
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
253,951
26
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
229,194
26.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
105
27
Pascucci Hope
Insider CIK 2003536 · Apr 24, 2026
Director, issuer-wide
222,402
28
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
221,399
28.1
Omni Small-Cap Value Fund
Fund S000033567 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
40,000
29
VANGUARD RUSSELL 2000 INDEX FUND
Fund S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
205,063
30
Empowered Funds, LLC
13F CIK 1592828 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
181,399
30.1
EA Bridgeway Omni Small-Cap Value ETF
Fund S000078089 · Registered fund · Jun 30, 2026
EA Series Trust, not summed
181,399
31
HENNESSY ADVISORS INC
13F CIK 1145255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
178,000
31.1
Hennessy Small Cap Financial Fund
Fund S000038531 · Registered fund · Jul 31, 2026
Hennessy Funds Trust, not summed
178,000
32
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
171,541
33
Darcey William
Insider CIK 2003467 · Apr 24, 2026
Director, issuer-wide
162,639
34
Lynch Christopher R.
Insider CIK 2003622 · Apr 24, 2026
Director, issuer-wide
156,922
35
Avantis U.S. Small Cap Value ETF
Fund S000066459 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
155,149
36
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
149,931
37
Orfanello Francis
Insider CIK 2004976 · Jan 2, 2026
Director, issuer-wide
143,140
38
SEI INVESTMENTS CO
13F CIK 350894 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
142,346
38.1
SIIT EXTENDED MARKET INDEX FUND
Fund S000035814 · Registered fund · May 31, 2026
SEI INSTITUTIONAL INVESTMENTS TRUST, not summed
6,400
39
FIRST TRUST ADVISORS LP
13F CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
142,253
39.1
First Trust Dow Jones Select MicroCap Index Fund
Fund S000010772 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
126,117
39.2
First Trust NASDAQ ABA Community Bank Index Fund
Fund S000026211 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
15,759
40
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
140,405
41
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
131,440
42
INTERNATIONAL ASSETS INVESTMENT MANAGEMENT, LLC
13F CIK 1818604 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
131,013
43
ALLIANCEBERNSTEIN L.P.
13F CIK 1109448 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
130,219
44
PANAGORA ASSET MANAGEMENT INC
13F CIK 883677 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
129,355
45
Qube Research & Technologies Ltd
13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
127,236
46
Financial Engines Advisors L.L.C.
13F CIK 1420473 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
126,788
47
MARSHALL WACE, LLP
13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
123,112
48
Lapointe Jean-Pierre
Insider CIK 1722126 · Aug 20, 2026
SEVP and CFO, issuer-wide
116,649
49
AQR CAPITAL MANAGEMENT LLC
13F CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
116,349
50
MANGROVE PARTNERS IM, LLC
13F CIK 1535392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
111,356

36 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 270 holders

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Key facts CIK 1979330 CUSIP 63945M107 13F (30d) 24 filings 24 filers Visit website Investor relations