NBBK · NB Bancorp, Inc. · Holdings

$22.88 -0.12 (-0.50%) At close · Sep 9

Russell 2000 member Rebalance outlook locked

Market Cap

$996.65M

43.82M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 161

Total Value: $470,288,847

Total Shares: 22,256,931

Showing 1–100 of 163 holdings by value · page 1 of 2

Institutional Ownership Trend

11 quarters

Holder Concentration

Across 161 13F filers · Δ vs Mar 31, 2026

Top Holder

15.0%

+1.7 pts

Top 5

43.2%

+1.9 pts

Top 10

59.0%

+2.4 pts

HHI

518

Broadly held+45

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -16

Institutional value: -4.1%

Shares held: -4.3%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid AltraVue Capital, LLC	+351,028	1,655,108
Mega BlackRock, Inc.	+247,322	3,331,544
Mega DIMENSIONAL FUND ADVISORS LP	+230,936	753,320
Mega CITADEL ADVISORS LLC	+189,643	355,114
Mega STATE STREET CORP	+178,228	1,471,766

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mid Pertento Partners LLP	−730,896	1,475,770
Large SEI INVESTMENTS CO	−159,835	142,346
Large RENAISSANCE TECHNOLOGIES LLC	−132,466	131,440
Mega GOLDMAN SACHS GROUP INC	−119,714	571,954
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−98,793	85,400

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large MARSHALL WACE, LLP	123,112	$2,601,355
Mid Y-Intercept (Hong Kong) Ltd	54,541	$1,152,451
Large Trexquant Investment LP	46,312	$978,572
Small MIRABELLA FINANCIAL SERVICES LLP	20,227	$427,396
Mega Jupiter Topco LLC	14,800	$312,724

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega WELLINGTON MANAGEMENT GROUP LLP	710,000	$14,959,700
Small Legato Capital Management LLC	276,070	$5,816,794
Mega JANE STREET GROUP, LLC	60,669	$1,278,295
Mid OP Asset Management Ltd	58,392	$1,230,319
Large LAZARD ASSET MANAGEMENT LLC	57,302	$1,207,353

Filter: New 13 Increased 67 Reduced 50 Sold out 29 Unchanged 31

Showing 100 of 163

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

BlackRock, Inc.

$70,395,519

14.97%

3,331,544

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	33,352	$704,727	1.0%	Sole
BlackRock Asset Management Canada Ltd	304	$6,423	0.0%	Sole
BlackRock Investment Management, LLC	150,061	$3,170,788	4.5%	Sole
BLACKROCK ADVISORS LLC	90,729	$1,917,103	2.7%	Sole
BlackRock Fund Advisors	1,711,210	$36,157,867	51.4%	Sole
BlackRock Institutional Trust Company, N.A.	1,201,901	$25,396,168	36.1%	Sole
BlackRock Fund Managers Ltd.	7,066	$149,304	0.2%	Sole
BlackRock Asset Management Ireland Ltd	39,533	$835,332	1.2%	Sole
BlackRock Asset Management Schweiz AG	3,906	$82,533	0.1%	Sole
Aperio Group, LLC	93,482	$1,975,274	2.8%	Sole

VANGUARD CAPITAL MANAGEMENT LLC

$35,304,743

7.51%

1,670,835

AltraVue Capital, LLC

$34,972,431

7.44%

1,655,108

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legato Capital Management LLC	366,090	$7,735,481	22.1%	Other
Held directly	1,289,018	$27,236,950	77.9%	Sole

Pertento Partners LLP

$31,183,020

6.63%

1,475,770

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Pertento Advisors LLC	1,475,770	$31,183,020	100.0%	Defined

STATE STREET CORP

$31,098,415

6.61%

1,471,766

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	1,471,766	$31,098,415	100.0%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$24,367,475

5.18%

1,153,217

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	147,840	$3,123,859	12.8%	Defined
Held directly	1,005,377	$21,243,616	87.2%	Defined

DIMENSIONAL FUND ADVISORS LP

$15,917,649

3.38%

753,320

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	3,130	$66,136	0.4%	Defined
DFA Australia Ltd.	9,739	$205,785	1.3%	Defined
Dimensional Ireland Ltd	17,905	$378,332	2.4%	Defined
Held directly	722,546	$15,267,396	95.9%	Sole

GOLDMAN SACHS GROUP INC

$12,085,387

2.57%

571,954

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	496,776	$10,496,876	86.9%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	75,178	$1,588,511	13.1%	Defined

Tieton Capital Management, LLC

$11,549,658

2.46%

546,600

HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC

$10,589,764

2.25%

501,172

Nuveen, LLC

$10,541,101

2.24%

498,869

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	3,184	$67,277	0.6%	Defined
TIAA CREF INVESTMENT MANAGEMENT LLC joint	440,200	$9,301,426	88.2%	Defined
TEACHERS ADVISORS, LLC joint	55,485	$1,172,398	11.1%	Defined

FMR LLC

$10,508,054

2.23%

497,305

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	496,532	$10,491,721	99.8%	Defined
STRATEGIC ADVISERS LLC	773	$16,333	0.2%	Defined

VANGUARD PORTFOLIO MANAGEMENT LLC

$8,389,581

1.78%

397,046

NORTHERN TRUST CORP

$7,617,194

1.62%

360,492

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	335,229	$7,083,388	93.0%	Defined
NORTHERN TRUST GLOBAL INVESTMENTS LTD	19,083	$403,223	5.3%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	6,180	$130,583	1.7%	Other

NEW YORK STATE COMMON RETIREMENT FUND

$7,314,255

1.56%

346,155

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$6,732,271

1.43%

318,612

CITADEL ADVISORS LLC

$6,123,769

1.30%

289,814

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	30,919	$653,318	10.7%	Defined
Held directly	258,895	$5,470,451	89.3%	Defined

TWO SIGMA INVESTMENTS, LP

$5,853,580

1.24%

277,027

AMERICAN CENTURY COMPANIES INC

$5,533,228

1.18%

261,866

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	261,866	$5,533,228	100.0%	Defined

VANGUARD FIDUCIARY TRUST CO

$5,365,984

1.14%

253,951

MORGAN STANLEY

$4,842,865

1.03%

229,194

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	155	$3,275	0.1%	Defined
MORGAN STANLEY & CO. LLC	17,357	$366,753	7.6%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	82,433	$1,741,809	36.0%	Defined
MORGAN STANLEY AIP GP LP	141	$2,979	0.1%	Defined
MORGAN STANLEY INVESTMENT MANAGEMENT INC	358	$7,564	0.2%	Defined
Morgan Stanley Investment Management LTD	5,462	$115,411	2.4%	Defined
MORGAN STANLEY SMITH BARNEY LLC	70,355	$1,486,601	30.7%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	52,933	$1,118,473	23.1%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$4,678,160

0.99%

221,399

Empowered Funds, LLC

$3,832,960

0.82%

181,399

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Bridgeway Capital Management, LLC	181,399	$3,832,960	100.0%	Other

HENNESSY ADVISORS INC

$3,761,140

0.80%

178,000

Bank of New York Mellon Corp

$3,624,660

0.77%

171,541

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	95,346	$2,014,660	55.6%	Defined
The Bank of New York Mellon	76,195	$1,610,000	44.4%	Defined

D. E. Shaw & Co., Inc.

$3,168,041

0.67%

149,931

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	132,717	$2,804,310	88.5%	Defined
D. E. Shaw Investment Management, L.L.C. joint	17,214	$363,731	11.5%	Defined

SEI INVESTMENTS CO

$3,007,770

0.64%

142,346

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI INVESTMENTS MANAGEMENT CORP	27	$570	0.0%	Sole
SEI TRUST CO	142,319	$3,007,200	100.0%	Sole

FIRST TRUST ADVISORS LP

$3,005,805

0.64%

142,253

UBS Group AG

$2,966,757

0.63%

140,405

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	1,924	$40,654	1.4%	Defined
UBS AG	41,281	$872,267	29.4%	Defined
UBS Europe SE	97,200	$2,053,836	69.2%	Defined

RENAISSANCE TECHNOLOGIES LLC

$2,777,327

0.59%

131,440

INTERNATIONAL ASSETS INVESTMENT MANAGEMENT, LLC

$2,768,304

0.59%

131,013

ALLIANCEBERNSTEIN L.P.

$2,751,527

0.59%

130,219

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	130,219	$2,751,527	100.0%	Defined

PANAGORA ASSET MANAGEMENT INC

$2,733,271

0.58%

129,355

Qube Research & Technologies Ltd

$2,688,496

0.57%

127,236

Financial Engines Advisors L.L.C.

$2,679,030

0.57%

126,788

MARSHALL WACE, LLP

$2,601,355

0.55%

123,112

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	123,112	$2,601,355	100.0%	Other

AQR CAPITAL MANAGEMENT LLC

$2,458,452

0.52%

116,349

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	3	$63	0.0%	Other
Prism Planning Partners LLC	124	$2,620	0.1%	Other
Arax Advisory Partners	1,286	$27,173	1.1%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	598	$12,635	0.5%	Other
Stokes Family Office, LLC	449	$9,487	0.4%	Other
Held directly	113,889	$2,406,474	97.9%	Defined

MANGROVE PARTNERS IM, LLC

$2,352,952

0.50%

111,356

Invesco Ltd.

$2,069,491

0.44%

97,941

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	5,385	$113,784	5.5%	Defined
Invesco Trust Co joint	16,195	$342,200	16.5%	Defined
Invesco Capital Management LLC	76,361	$1,613,507	78.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,804,502

0.38%

85,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	85,400	$1,804,502	100.0%	Other

Oppenheimer & Close, LLC

$1,753,768

0.37%

82,999

MILLENNIUM MANAGEMENT LLC

$1,720,975

0.37%

81,447

Swiss National Bank

$1,629,123

0.35%

77,100

CREDIT AGRICOLE S A

$1,479,100

0.31%

70,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Credit Agricole Corporate & Investment Bank joint	70,000	$1,479,100	100.0%	Defined

MACKENZIE FINANCIAL CORP

$1,425,028

0.30%

67,441

Creative Planning

$1,422,470

0.30%

67,320

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
CREATIVE PLANNING TRUST Co LLC	1,222	$25,820	1.8%	Defined
Held directly	66,098	$1,396,650	98.2%	Sole

Round Rock Advisors LLC

$1,405,778

0.30%

66,530

Focus Partners Wealth

$1,388,832

0.30%

65,728

BNP PARIBAS ARBITRAGE, SA

$1,320,160

0.28%

62,478

PRINCIPAL FINANCIAL GROUP INC

$1,251,550

0.27%

59,231

Legal & General Group Plc

$1,198,449

0.25%

56,718

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	3,949	$83,442	7.0%	Defined
Legal & General Investment Management Ltd joint	52,769	$1,115,007	93.0%	Defined

Y-Intercept (Hong Kong) Ltd

$1,152,451

0.25%

54,541

RHUMBLINE ADVISERS

$1,113,339

0.24%

52,690

LYNCH & ASSOCIATES/IN

$1,063,557

0.23%

50,334

STILWELL VALUE LLC

$1,056,500

0.22%

50,000

BANK OF AMERICA CORP /DE/

$1,033,362

0.22%

48,905

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	48,905	$1,033,362	100.0%	Defined

NIXON PEABODY TRUST CO

$1,025,143

0.22%

48,516

Integrated Wealth Concepts LLC

$1,007,710

0.21%

47,691

AMERIPRISE FINANCIAL INC

$990,975

0.21%

46,899

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	46,899	$990,975	100.0%	Defined

CITIGROUP INC

$984,234

0.21%

46,580

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citibank, N.A. joint	3,051	$64,467	6.5%	Defined
Citigroup Financial Products Inc. joint	43,529	$919,767	93.5%	Defined

Trexquant Investment LP

$978,572

0.21%

46,312

PRICE T ROWE ASSOCIATES INC /MD/

$972,318

0.21%

46,016

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	46,016	$972,318	100.0%	Defined

FEDERATED HERMES, INC.

$950,152

0.20%

44,967

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FEDERATED MDTA LLC	44,967	$950,152	100.0%	Defined

Quantinno Capital Management LP

$932,614

0.20%

44,137

WEDGE CAPITAL MANAGEMENT L L P/NC

$913,154

0.19%

43,216

Mariner, LLC

$897,412

0.19%

42,471

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mariner Managed Account Solutions, LLC	9,755	$206,123	23.0%	Sole
Held directly	32,716	$691,289	77.0%	Sole

CITADEL ADVISORS LLC

$889,573

0.19%

42,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	42,100	$889,573	100.0%	Defined

XTX Topco Ltd

$885,600

0.19%

41,912

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	41,912	$885,600	100.0%	Defined

DEUTSCHE BANK AG\

$866,837

0.18%

41,024

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investments UK Ltd	41,024	$866,837	100.0%	Defined

EJF Capital LP

$861,068

0.18%

40,751

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

$824,429

0.18%

39,017

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$810,524

0.17%

38,359

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	337	$7,120	0.9%	Defined
UBS Asset Management Switzerland AG	38,022	$803,404	99.1%	Sole

Aviance Capital Partners, LLC

$806,595

0.17%

38,173

STATE OF WISCONSIN INVESTMENT BOARD

$806,510

0.17%

38,169

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

$760,278

0.16%

35,981

WELLS FARGO & COMPANY/MN

$743,458

0.16%

35,185

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	33,805	$714,299	96.1%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	400	$8,452	1.1%	Defined
WELLS FARGO CLEARING SERVICES, LLC	678	$14,326	1.9%	Defined
Wells Fargo Securities, LLC	278	$5,874	0.8%	Defined
WELLS FARGO INVESTMENT INSTITUTE, INC.	24	$507	0.1%	Defined

Bleakley Financial Group, LLC

$724,167

0.15%

34,272

RAFFLES ASSOCIATES LP

$673,497

0.14%

31,874

Allspring Global Investments Holdings, LLC

$642,964

0.14%

30,429

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Allspring Funds Management, LLC reporting on behalf of Morgan Stanley Smith Barney, LLC	20	$422	0.1%	Defined
Allspring Global Investments, LLC reporting on behalf of UBS ASSET MANAGEMENT AMERICAS INC	30,409	$642,542	99.9%	Defined

RAYMOND JAMES FINANCIAL INC

$632,082

0.13%

29,914

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Raymond James Financial Services Advisors, Inc.	29,914	$632,082	100.0%	Defined

FRANKLIN RESOURCES INC

$599,458

0.13%

28,370

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brandywine Global Investment Management, LLC	28,370	$599,458	100.0%	Defined

LPL Financial LLC

$558,022

0.12%

26,409

Rafferty Asset Management, LLC

$539,427

0.11%

25,529

NORTHEAST INVESTMENT MANAGEMENT

$528,250

0.11%

25,000

Vanguard Global Advisers, LLC

$516,501

0.11%

24,444

MetLife Investment Management, LLC

$508,641

0.11%

24,072

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	24,072	$508,641	100.0%	Defined

BARCLAYS PLC

$506,083

0.11%

23,951

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	23,030	$486,623	96.2%	Defined
BARCLAYS CAPITAL INC.	921	$19,460	3.8%	Defined

VANGUARD ASSET MANAGEMENT, Ltd

$496,216

0.11%

23,484

CITADEL ADVISORS LLC

$490,216

0.10%

23,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	23,200	$490,216	100.0%	Defined

Russell Investments Group, Ltd.

$450,744

0.10%

21,332

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	21,332	$450,744	100.0%	Defined

MIRABELLA FINANCIAL SERVICES LLP

$427,396

0.09%

20,227

Investment Advisory Group, LLC

$422,600

0.09%

20,000

&PARTNERS

$416,894

0.09%

19,730

COMMONWEALTH EQUITY SERVICES, LLC

$407,492

0.09%

19,285

JPMORGAN CHASE & CO

$407,449

0.09%

19,283

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	18,749	$396,166	97.2%	Defined
J.P. Morgan Investment Management Inc.	325	$6,867	1.7%	Defined
J.P. Morgan Securities plc	209	$4,416	1.1%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$395,976

0.08%

18,740

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	18,740	$395,976	100.0%	Defined

Harbor Advisors LLC

$369,775

0.08%

17,500

MERCER GLOBAL ADVISORS INC /ADV

$359,040

0.08%

16,992

Zurcher Kantonalbank (Zurich Cantonalbank)

$358,702

0.08%

16,976

KESTRA PRIVATE WEALTH SERVICES, LLC

$354,265

0.08%

16,766

Key facts CIK 1979330 CUSIP 63945M107 13F (30d) 97 filings 97 filers Visit website