NB Bancorp, Inc.: which funds bought and sold

Institutions that bought and sold NB Bancorp shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 81 institutions that filed 13F reports for both quarters added to or opened positions in NB Bancorp, and 74 cut or closed them. Together they sold a net 626K shares, −2.8% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 683K shares (−16.7%); index fund managers were net buyers of 478K shares (+5.6%). 12 opened a new position and 26 sold out entirely.

Bought, Q2 2026 81 institutions, 12 of them new holders Sold, Q2 2026 74 institutions, 26 of them sold out

Net change, all compared −626K shares (−2.8%)

Net change, active managers −683K shares (−16.7%), 12 bought, 16 sold

Buyers versus sellers

institutions compared, 185

81 bought 30 74 sold

Active managers and hedge funds 12 bought · 16 sold · −683K

Index fund managers 6 bought · 4 sold · +478K

Other institutions 63 bought · 54 sold · −421K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Altravue Capital, LLC	+351K +26.9%	1.7M	$35M
Blackrock, Inc. Index funds	+247K +8.0%	3.3M	$70.4M
Dimensional Fund Advisors LP	+231K +44.2%	753K	$15.9M
State Street Corp Index funds	+178K +13.8%	1.5M	$31.1M
Citadel Advisors LLC Hedge fund	+173K +149.0%	290K	$6.1M
Marshall Wace, LLP Hedge fund	+123K New position	123K	$2.6M
New York State Common Retirement Fund	+86K +32.8%	346K	$7.3M
D. E. Shaw & Co., Inc. Hedge fund	+80K +113.0%	150K	$3.2M
UBS Group AG	+64K +84.5%	140K	$3M
FMR LLC Active manager	+60K +13.6%	497K	$10.5M
Y-Intercept (Hong Kong) Ltd	+55K New position	55K	$1.2M
Geode Capital Management, LLC Index funds	+54K +4.9%	1.2M	$24.4M
Hotchkis & Wiley Capital Management LLC Active manager	+50K +11.2%	501K	$10.6M
Raffles Associates LP	+49K +328.6%	64K	$1.3M
Trexquant Investment LP Hedge fund	+46K New position	46K	$978,573
Integrated Wealth Concepts LLC	+31K +64.2%	79K	$1.7M
Northern Trust Corp Index funds	+25K +7.5%	360K	$7.6M
Bank Of New York Mellon Corp	+23K +15.9%	172K	$3.6M
Bleakley Financial Group, LLC	+21K +152.7%	34K	$724,167
Mirabella Financial Services LLP	+20K New position	20K	$427,397

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	+173K +149.0%	290K	$6.1M
Marshall Wace, LLP Hedge fund	+123K New position	123K	$2.6M
D. E. Shaw & Co., Inc. Hedge fund	+80K +113.0%	150K	$3.2M
FMR LLC Active manager	+60K +13.6%	497K	$10.5M
Hotchkis & Wiley Capital Management LLC Active manager	+50K +11.2%	501K	$10.6M
Trexquant Investment LP Hedge fund	+46K New position	46K	$978,573
Bridgeway Capital Management, LLC Active manager	+13K +6.2%	221K	$4.7M
Federated Hermes, Inc. Active manager	+11K +32.6%	45K	$950,153
Price T Rowe Associates Inc Active manager	+4,944 +12.0%	46K	$973,000
Franklin Resources Inc Active manager	+1,100 +4.0%	28K	$599,458

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Pertento Partners LLP	−731K −33.1%	1.5M	$31.2M
Wellington Management Group LLP Active manager	−710K Sold out	0	—
Sei Investments Co	−160K −52.9%	142K	$3M
Renaissance Technologies LLC Hedge fund	−132K −50.2%	131K	$2.8M
Goldman Sachs Group Inc	−120K −17.3%	572K	$12.1M
Two Sigma Investments, LP Hedge fund	−95K −25.5%	277K	$5.9M
Millennium Management LLC Hedge fund	−77K −48.5%	81K	$1.7M
Bank Of America Corp	−70K −58.8%	49K	$1M
Jane Street Group, LLC	−61K Sold out	0	—
OP Asset Management Ltd	−58K Sold out	0	—
Lazard Asset Management LLC Active manager	−57K Sold out	0	—
Susquehanna International Group, LLP	−52K Sold out	0	—
Morgan Stanley	−51K −18.1%	229K	$4.8M
Qube Research & Technologies Ltd Hedge fund	−48K −27.3%	127K	$2.7M
Integrated Quantitative Investments LLC	−37K Sold out	0	—
Vanguard Capital Management LLC Index funds	−33K −1.9%	1.7M	$35.3M
Connor, Clark & Lunn Investment Management Ltd.	−32K Sold out	0	—
Susquehanna Fundamental Investments, LLC	−28K Sold out	0	—
Focus Partners Wealth	−27K −29.2%	66K	$1.4M
Los Angeles Capital Management LLC Active manager	−25K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Wellington Management Group LLP Active manager	−710K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−132K −50.2%	131K	$2.8M
Two Sigma Investments, LP Hedge fund	−95K −25.5%	277K	$5.9M
Millennium Management LLC Hedge fund	−77K −48.5%	81K	$1.7M
Lazard Asset Management LLC Active manager	−57K Sold out	0	—
Qube Research & Technologies Ltd Hedge fund	−48K −27.3%	127K	$2.7M
Los Angeles Capital Management LLC Active manager	−25K Sold out	0	—
Martingale Asset Management L P Active manager	−24K Sold out	0	—
Panagora Asset Management Inc Active manager	−21K −13.8%	129K	$2.7M
AQR Capital Management LLC Hedge fund	−12K −9.7%	116K	$2.5M

New positions

largest by value

Institution	Shares	Value June 30, 2026
Marshall Wace, LLPHedge fund	123K	$2.6M
Y-Intercept (Hong Kong) Ltd	55K	$1.2M
Trexquant Investment LPHedge fund	46K	$978,573
Mirabella Financial Services LLP	20K	$427,397
Imc-Chicago, LLC	13K	$275,261
Sequoia Financial Advisors, LLC	11K	$223,556
Corient Private Wealth LP	10K	$220,620
Picton Mahoney Asset Management	114	$2,409
Minot Deblois Advisors LLC	85	$1,796
Silver Grove Financial Group, Inc.	85	$1,796

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Wellington Management Group LLPActive manager	710K	$15M
Jane Street Group, LLC	61K	$1.3M
OP Asset Management Ltd	58K	$1.2M
Lazard Asset Management LLCActive manager	57K	$1.2M
Susquehanna International Group, LLP	52K	$1.1M
Integrated Quantitative Investments LLC	37K	$781,170
Connor, Clark & Lunn Investment Management Ltd.	32K	$679,486
Susquehanna Fundamental Investments, LLC	28K	$586,589
Los Angeles Capital Management LLCActive manager	25K	$534,651
Four Tree Island Advisory LLC	25K	$526,982

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 160
Ten largest holders: 59.2%
Index fund managers: 40.7%
Active managers and hedge funds: 15.4%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	12	16	2	8	−683K	−16.7%
Index fund managers	6	4	0	0	+478K	+5.6%
Other institutions	63	54	10	18	−421K	−4.2%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on NB Bancorp.

Only managers that filed a holdings report for both quarters are compared (185 here). 4 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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