NB Bancorp, Inc.
NBBK- Exchange
- Nasdaq
- Industry
- Savings Institutions, Not Federally Chartered
- SEC CIK
- 0001979330
In the last 90 days, NB Bancorp, Inc. insiders filed 2 open-market purchases and 1 sale; 161 institutions reported holding it in 13F filings for Q2 2026, worth $474.9M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in NB Bancorp, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 177
- +15 vs. Q4 2025
- Shares held
- 23.1M
- +3.14M (+15.7%) vs. Q4 2025
- Total value
- $486.3M
- +$91.1M (+23.1%) vs. Q4 2025
- New holders
- 32
- 66 more added
- Sold out
- 17
- 44 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting NBBK on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 161 | $474.9M |
| Q1 2026 | 177 | $486.3M |
| Q4 2025 | 164 | $441.3M |
| Q3 2025 | 146 | $338.8M |
| Q2 2025 | 132 | $334.4M |
| Q1 2025 | 122 | $331.3M |
| Q4 2024 | 114 | $326.7M |
| Q3 2024 | 108 | $355.7M |
| Q2 2024 | 92 | $253.2M |
| Q1 2024 | 56 | $131.0M |
| Q4 2023 | 17 | $34.7M |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding NB Bancorp, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Deutsche Bank AG | 31,106 | $655.4K | 0.00% | +6,081+24.3% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 32,249 | $679.5K | 0.00% | +12,490+63.2% | Added |
| Citigroup Inc | 33,451 | $704.8K | 0.00% | +10,566+46.2% | Added |
| Federated Hermes, Inc. | 33,899 | $714.3K | 0.00% | −338−1.0% | Reduced |
| JPMorgan Chase & Co | 36,088 | $746.3K | 0.00% | −23,125−39.1% | Reduced |
| California State Teachers Retirement System | 35,797 | $754.2K | 0.00% | −296−0.8% | Reduced |
| Integrated Quantitative Investments LLC | 37,075 | $781.2K | 0.14% | −3,869−9.4% | Reduced |
| Aviance Capital Partners, LLC | 37,167 | $783.1K | 0.09% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 39,362 | $829.4K | 0.00% | +170+0.4% | Added |
| XTX Topco Ltd | 39,782 | $838.2K | 0.01% | +39,782 | New |
| Arrowstreet Capital, Limited Partnership | 40,276 | $848.6K | 0.00% | +21,410+113.5% | Added |
| Price T Rowe Associates Inc | 41,072 | $866.0K | 0.00% | +1,579+4.0% | Added |
| EJF Capital LLC | 41,457 | $873.5K | 0.62% | −133,522−76.3% | Reduced |
| Ameriprise Financial Inc | 41,959 | $884.1K | 0.00% | −36,641−46.6% | Reduced |
| Wedge Capital Management L L P | 42,356 | $892.4K | 0.02% | +42,356 | New |
| Integrated Wealth Concepts LLC | 47,927 | $1.01M | 0.01% | +331+0.7% | Added |
| Nixon Peabody Trust Co | 48,516 | $1.02M | 0.08% | 00.0% | Unchanged |
| Mariner, LLC | 49,495 | $1.04M | 0.00% | +13,129+36.1% | Added |
| Mackenzie Financial Corp | 50,897 | $1.07M | 0.00% | +50,897 | New |
| Susquehanna International Group, LLP | 51,593 | $1.09M | 0.00% | +51,593 | New |
| BNP Paribas Arbitrage, SA | 53,005 | $1.12M | 0.00% | −17,874−25.2% | Reduced |
| Legal & General Group Plc | 53,008 | $1.12M | 0.00% | −7,608−12.6% | Reduced |
| Rhumbline Advisers | 53,175 | $1.12M | 0.00% | +964+1.8% | Added |
| Lynch & Associates | 53,334 | $1.12M | 0.21% | −1,000−1.8% | Reduced |
| Principal Financial Group Inc | 55,364 | $1.17M | 0.00% | −9,105−14.1% | Reduced |
| Lazard Asset Management LLC | 57,302 | $1.21M | 0.00% | +5,142+9.9% | Added |
| OP Asset Management Ltd | 58,392 | $1.23M | 0.01% | +58,392 | New |
| Jane Street Group, LLC | 60,669 | $1.28M | 0.00% | −20,972−25.7% | Reduced |
| Stilwell Value LLC | 65,000 | $1.37M | 0.82% | 00.0% | Unchanged |
| Round Rock Advisors, LLC | 66,467 | $1.40M | 0.21% | +14,561+28.1% | Added |
| Credit Agricole S A | 70,000 | $1.47M | 0.00% | +70,000 | New |
| D. E. Shaw & Co., Inc. | 70,385 | $1.48M | 0.00% | +24,619+53.8% | Added |
| Creative Planning | 70,906 | $1.49M | 0.00% | +18,411+35.1% | Added |
| UBS Group AG | 76,120 | $1.60M | 0.00% | −69,974−47.9% | Reduced |
| Swiss National Bank | 77,100 | $1.62M | 0.00% | 00.0% | Unchanged |
| Oppenheimer & Close, LLC | 82,999 | $1.75M | 1.10% | 00.0% | Unchanged |
| Colony Group, LLC | 92,809 | $1.96M | 0.00% | +1,443+1.6% | Added |
| Invesco Ltd. | 101,244 | $2.13M | 0.00% | +37,907+59.8% | Added |
| Mangrove Partners | 111,356 | $2.35M | 0.19% | 00.0% | Unchanged |
| Citadel Advisors LLC | 116,371 | $2.45M | 0.00% | +9,914+9.3% | Added |
| Bank of America Corp | 118,801 | $2.50M | 0.00% | +28,160+31.1% | Added |
| Alliancebernstein L.P. | 130,219 | $2.58M | 0.00% | −124,000−48.8% | Reduced |
| Financial Engines Advisors L.L.C. | 125,723 | $2.65M | 0.01% | +8,016+6.8% | Added |
| AQR Capital Management LLC | 128,821 | $2.71M | 0.00% | +23,810+22.7% | Added |
| International Assets Investment Management, LLC | 131,013 | $2.78M | 0.19% | +44,113+50.8% | Added |
| First Trust Advisors LP | 140,264 | $2.96M | 0.00% | −1,823−1.3% | Reduced |
| Bank of New York Mellon Corp | 148,066 | $3.12M | 0.00% | −1,155−0.8% | Reduced |
| Panagora Asset Management Inc | 150,096 | $3.16M | 0.01% | −295−0.2% | Reduced |
| Millennium Management LLC | 158,243 | $3.33M | 0.00% | +103,377+188.4% | Added |
| Empowered Funds, LLC | 168,394 | $3.55M | 0.02% | +15,244+10.0% | Added |
| Qube Research & Technologies Ltd | 175,066 | $3.69M | 0.01% | +157,714+908.9% | Added |
| Hennessy Advisors Inc | 180,000 | $3.79M | 0.14% | −1,000−0.6% | Reduced |
| Bridgeway Capital Management, LLC | 208,394 | $4.39M | 0.09% | +15,244+7.9% | Added |
| Vanguard Fiduciary Trust Co | 254,038 | $5.35M | 0.00% | +254,038 | New |
| New York State Common Retirement Fund | 260,585 | $5.49M | 0.01% | +116,200+80.5% | Added |
| American Century Companies Inc | 263,656 | $5.56M | 0.00% | +41,801+18.8% | Added |
| Renaissance Technologies LLC | 263,906 | $5.56M | 0.01% | +12,632+5.0% | Added |
| Legato Capital Management LLC | 276,070 | $5.82M | 0.53% | +104,709+61.1% | Added |
| Morgan Stanley | 279,870 | $5.90M | 0.00% | +37,738+15.6% | Added |
| SEI Investments Co | 302,181 | $6.37M | 0.01% | +158,397+110.2% | Added |
| Charles Schwab Investment Management Inc | 318,365 | $6.71M | 0.00% | −11,033−3.3% | Reduced |
| Northern Trust Corp | 335,360 | $7.07M | 0.00% | +11,047+3.4% | Added |
| Two Sigma Investments, LP | 371,807 | $7.83M | 0.01% | +118,962+47.0% | Added |
| Vanguard Portfolio Management LLC | 386,132 | $8.14M | 0.00% | +386,132 | New |
| FMR LLC | 437,725 | $9.22M | 0.00% | +54,513+14.2% | Added |
| Hotchkis & Wiley Capital Management LLC | 450,772 | $9.50M | 0.03% | −251,220−35.8% | Reduced |
| Nuveen, LLC | 488,033 | $10.3M | 0.00% | +141,254+40.7% | Added |
| Dimensional Fund Advisors LP | 522,384 | $11.0M | 0.00% | +234,356+81.4% | Added |
| Tieton Capital Management, LLC | 553,570 | $11.7M | 3.91% | +28,635+5.5% | Added |
| Goldman Sachs Group Inc | 691,668 | $14.6M | 0.00% | +97,780+16.5% | Added |
| Wellington Management Group LLP | 710,000 | $15.0M | 0.00% | −761,189−51.7% | Reduced |
| Geode Capital Management, LLC | 1,098,930 | $23.2M | 0.00% | +132,268+13.7% | Added |
| State Street Corp | 1,293,538 | $27.3M | 0.00% | +179,159+16.1% | Added |
| AltraVue Capital, LLC | 1,304,080 | $27.5M | 2.37% | +611,080+88.2% | Added |
| Vanguard Capital Management LLC | 1,703,928 | $35.9M | 0.00% | +1,703,928 | New |
| Pertento Partners LLP | 2,206,666 | $46.5M | 4.93% | −137,110−5.8% | Reduced |
| BlackRock, Inc. | 3,084,222 | $65.0M | 0.00% | −19,548−0.6% | Reduced |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −251,512−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −140,001−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −38,264−100.0% | Sold out |
| Occudo Quantitative Strategies LP | 0 | $0 | 0.00% | −32,155−100.0% | Sold out |
| Belvedere Trading LLC | 0 | $0 | 0.00% | −26,577−100.0% | Sold out |
| Modera Wealth Management, LLC | 0 | $0 | 0.00% | −22,011−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −20,905−100.0% | Sold out |
| NewEdge Wealth, LLC | 0 | $0 | 0.00% | −18,418−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −16,681−100.0% | Sold out |
| Davis R M Inc | 0 | $0 | 0.00% | −15,930−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −15,064−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −14,651−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −9,486−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −6,436−100.0% | Sold out |
| Kestra Advisory Services, LLC | 0 | $0 | 0.00% | −2,325−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −1,254−100.0% | Sold out |
| Eurizon Capital SGR S.p.A. | 0 | $0 | 0.00% | −275−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Brandywine Global Investment Management, LLC | – | – | – | – | Not filed |