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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,084,222 | $65.0M | 0.00% | −19,548−0.6% | Reduced |
| Pertento Partners LLP | 2,206,666 | $46.5M | 4.93% | −137,110−5.8% | Reduced |
| Vanguard Capital Management LLC | 1,703,928 | $35.9M | 0.00% | +1,703,928 | New |
| AltraVue Capital, LLC | 1,304,080 | $27.5M | 2.37% | +611,080+88.2% | Added |
| State Street Corp | 1,293,538 | $27.3M | 0.00% | +179,159+16.1% | Added |
| Geode Capital Management, LLC | 1,098,930 | $23.2M | 0.00% | +132,268+13.7% | Added |
| Wellington Management Group LLP | 710,000 | $15.0M | 0.00% | −761,189−51.7% | Reduced |
| Goldman Sachs Group Inc | 691,668 | $14.6M | 0.00% | +97,780+16.5% | Added |
| Tieton Capital Management, LLC | 553,570 | $11.7M | 3.91% | +28,635+5.5% | Added |
| Dimensional Fund Advisors LP | 522,384 | $11.0M | 0.00% | +234,356+81.4% | Added |
| Nuveen, LLC | 488,033 | $10.3M | 0.00% | +141,254+40.7% | Added |
| Hotchkis & Wiley Capital Management LLC | 450,772 | $9.50M | 0.03% | −251,220−35.8% | Reduced |
| FMR LLC | 437,725 | $9.22M | 0.00% | +54,513+14.2% | Added |
| Vanguard Portfolio Management LLC | 386,132 | $8.14M | 0.00% | +386,132 | New |
| Two Sigma Investments, LP | 371,807 | $7.83M | 0.01% | +118,962+47.0% | Added |
| Northern Trust Corp | 335,360 | $7.07M | 0.00% | +11,047+3.4% | Added |
| Charles Schwab Investment Management Inc | 318,365 | $6.71M | 0.00% | −11,033−3.3% | Reduced |
| SEI Investments Co | 302,181 | $6.37M | 0.01% | +158,397+110.2% | Added |
| Morgan Stanley | 279,870 | $5.90M | 0.00% | +37,738+15.6% | Added |
| Legato Capital Management LLC | 276,070 | $5.82M | 0.53% | +104,709+61.1% | Added |
| Renaissance Technologies LLC | 263,906 | $5.56M | 0.01% | +12,632+5.0% | Added |
| American Century Companies Inc | 263,656 | $5.56M | 0.00% | +41,801+18.8% | Added |
| New York State Common Retirement Fund | 260,585 | $5.49M | 0.01% | +116,200+80.5% | Added |
| Vanguard Fiduciary Trust Co | 254,038 | $5.35M | 0.00% | +254,038 | New |
| Bridgeway Capital Management, LLC | 208,394 | $4.39M | 0.09% | +15,244+7.9% | Added |
| Hennessy Advisors Inc | 180,000 | $3.79M | 0.14% | −1,000−0.6% | Reduced |
| Qube Research & Technologies Ltd | 175,066 | $3.69M | 0.01% | +157,714+908.9% | Added |
| Empowered Funds, LLC | 168,394 | $3.55M | 0.02% | +15,244+10.0% | Added |
| Millennium Management LLC | 158,243 | $3.33M | 0.00% | +103,377+188.4% | Added |
| Panagora Asset Management Inc | 150,096 | $3.16M | 0.01% | −295−0.2% | Reduced |
| Bank of New York Mellon Corp | 148,066 | $3.12M | 0.00% | −1,155−0.8% | Reduced |
| First Trust Advisors LP | 140,264 | $2.96M | 0.00% | −1,823−1.3% | Reduced |
| International Assets Investment Management, LLC | 131,013 | $2.78M | 0.19% | +44,113+50.8% | Added |
| AQR Capital Management LLC | 128,821 | $2.71M | 0.00% | +23,810+22.7% | Added |
| Financial Engines Advisors L.L.C. | 125,723 | $2.65M | 0.01% | +8,016+6.8% | Added |
| Alliancebernstein L.P. | 130,219 | $2.58M | 0.00% | −124,000−48.8% | Reduced |
| Bank of America Corp | 118,801 | $2.50M | 0.00% | +28,160+31.1% | Added |
| Citadel Advisors LLC | 116,371 | $2.45M | 0.00% | +9,914+9.3% | Added |
| Mangrove Partners | 111,356 | $2.35M | 0.19% | 00.0% | Unchanged |
| Invesco Ltd. | 101,244 | $2.13M | 0.00% | +37,907+59.8% | Added |
| Colony Group, LLC | 92,809 | $1.96M | 0.00% | +1,443+1.6% | Added |
| Oppenheimer & Close, LLC | 82,999 | $1.75M | 1.10% | 00.0% | Unchanged |
| Swiss National Bank | 77,100 | $1.62M | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 76,120 | $1.60M | 0.00% | −69,974−47.9% | Reduced |
| Creative Planning | 70,906 | $1.49M | 0.00% | +18,411+35.1% | Added |
| D. E. Shaw & Co., Inc. | 70,385 | $1.48M | 0.00% | +24,619+53.8% | Added |
| Credit Agricole S A | 70,000 | $1.47M | 0.00% | +70,000 | New |
| Round Rock Advisors, LLC | 66,467 | $1.40M | 0.21% | +14,561+28.1% | Added |
| Stilwell Value LLC | 65,000 | $1.37M | 0.82% | 00.0% | Unchanged |
| Jane Street Group, LLC | 60,669 | $1.28M | 0.00% | −20,972−25.7% | Reduced |
| OP Asset Management Ltd | 58,392 | $1.23M | 0.01% | +58,392 | New |
| Lazard Asset Management LLC | 57,302 | $1.21M | 0.00% | +5,142+9.9% | Added |
| Principal Financial Group Inc | 55,364 | $1.17M | 0.00% | −9,105−14.1% | Reduced |
| Lynch & Associates | 53,334 | $1.12M | 0.21% | −1,000−1.8% | Reduced |
| Rhumbline Advisers | 53,175 | $1.12M | 0.00% | +964+1.8% | Added |
| Legal & General Group Plc | 53,008 | $1.12M | 0.00% | −7,608−12.6% | Reduced |
| BNP Paribas Arbitrage, SA | 53,005 | $1.12M | 0.00% | −17,874−25.2% | Reduced |
| Susquehanna International Group, LLP | 51,593 | $1.09M | 0.00% | +51,593 | New |
| Mackenzie Financial Corp | 50,897 | $1.07M | 0.00% | +50,897 | New |
| Mariner, LLC | 49,495 | $1.04M | 0.00% | +13,129+36.1% | Added |
| Nixon Peabody Trust Co | 48,516 | $1.02M | 0.08% | 00.0% | Unchanged |
| Integrated Wealth Concepts LLC | 47,927 | $1.01M | 0.01% | +331+0.7% | Added |
| Wedge Capital Management L L P | 42,356 | $892.4K | 0.02% | +42,356 | New |
| Ameriprise Financial Inc | 41,959 | $884.1K | 0.00% | −36,641−46.6% | Reduced |
| EJF Capital LLC | 41,457 | $873.5K | 0.62% | −133,522−76.3% | Reduced |
| Price T Rowe Associates Inc | 41,072 | $866.0K | 0.00% | +1,579+4.0% | Added |
| Arrowstreet Capital, Limited Partnership | 40,276 | $848.6K | 0.00% | +21,410+113.5% | Added |
| XTX Topco Ltd | 39,782 | $838.2K | 0.01% | +39,782 | New |
| UBS Asset Management Americas Inc | 39,362 | $829.4K | 0.00% | +170+0.4% | Added |
| Aviance Capital Partners, LLC | 37,167 | $783.1K | 0.09% | 00.0% | Unchanged |
| Integrated Quantitative Investments LLC | 37,075 | $781.2K | 0.14% | −3,869−9.4% | Reduced |
| California State Teachers Retirement System | 35,797 | $754.2K | 0.00% | −296−0.8% | Reduced |
| JPMorgan Chase & Co | 36,088 | $746.3K | 0.00% | −23,125−39.1% | Reduced |
| Federated Hermes, Inc. | 33,899 | $714.3K | 0.00% | −338−1.0% | Reduced |
| Citigroup Inc | 33,451 | $704.8K | 0.00% | +10,566+46.2% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 32,249 | $679.5K | 0.00% | +12,490+63.2% | Added |
| Deutsche Bank AG | 31,106 | $655.4K | 0.00% | +6,081+24.3% | Added |
| Rafferty Asset Management, LLC | 29,998 | $632.1K | 0.00% | +5,802+24.0% | Added |
| Allspring Global Investments Holdings, LLC | 29,474 | $626.3K | 0.00% | +29,474 | New |
| Susquehanna Fundamental Investments, LLC | 27,840 | $586.6K | 0.02% | −1,182−4.1% | Reduced |
| Franklin Resources Inc | 27,270 | $574.6K | 0.00% | +27,270 | New |
| LPL Financial LLC | 26,360 | $555.4K | 0.00% | +2,032+8.4% | Added |
| Quantinno Capital Management LP | 25,941 | $546.6K | 0.00% | +2,620+11.2% | Added |
| Los Angeles Capital Management LLC | 25,375 | $534.7K | 0.00% | −64,995−71.9% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 25,370 | $534.5K | 0.01% | 00.0% | Unchanged |
| Four Tree Island Advisory LLC | 25,011 | $527.0K | 0.27% | +3,555+16.6% | Added |
| Northeast Investment Management | 25,000 | $526.8K | 0.02% | +2,000+8.7% | Added |
| State of Wisconsin Investment Board | 24,386 | $513.8K | 0.00% | −2,255−8.5% | Reduced |
| Martingale Asset Management L P | 23,900 | $503.6K | 0.01% | +12,200+104.3% | Added |
| Vanguard Global Advisers, LLC | 23,514 | $495.4K | 0.00% | +23,514 | New |
| Vanguard Asset Management, Ltd | 23,484 | $494.8K | 0.00% | +23,484 | New |
| Barclays PLC | 23,099 | $486.7K | 0.00% | −47,673−67.4% | Reduced |
| MetLife Investment Management | 22,806 | $480.5K | 0.00% | −316−1.4% | Reduced |
| Commonwealth Equity Services, LLC | 22,492 | $473.9K | 0.00% | +996+4.6% | Added |
| Investment Advisory Group, LLC | 20,000 | $421.4K | 0.11% | 00.0% | Unchanged |
| Wiley Bros.-Aintree Capital, LLC | 19,730 | $415.7K | 0.00% | −100−0.5% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 18,693 | $393.9K | 0.00% | +143+0.8% | Added |
| Polymer Capital Management (US) LLC | 17,866 | $376.4K | 0.06% | +17,866 | New |
| Kestra Private Wealth Services, LLC | 17,731 | $373.6K | 0.00% | −1,969−10.0% | Reduced |
| Cerity Partners LLC | 17,388 | $366.4K | 0.00% | +17,388 | New |