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, Q4 2025
Institutional positions in NB Bancorp, Inc. as of Dec 31, 2025. 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
- 164
- +21 vs. Q3 2025
- Shares held
- 22.3M
- +3.17M (+16.6%) vs. Q3 2025
- Total value
- $441.3M
- +$104.0M (+30.8%) vs. Q3 2025
- New holders
- 34
- 78 more added
- Sold out
- 13
- 35 more reduced
3 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding NB Bancorp, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,103,770 | $61.5M | 0.00% | +281,645+10.0% | Added |
| Pertento Partners LLP | 2,343,776 | $46.5M | 5.10% | +229,440+10.9% | Added |
| Vanguard Group Inc | 2,301,034 | $45.6M | 0.00% | +350,899+18.0% | Added |
| Wellington Management Group LLP | 1,471,189 | $29.2M | 0.01% | −355,750−19.5% | Reduced |
| State Street Corp | 1,114,379 | $22.1M | 0.00% | −82,543−6.9% | Reduced |
| Geode Capital Management, LLC | 966,662 | $19.2M | 0.00% | +90,014+10.3% | Added |
| Hotchkis & Wiley Capital Management LLC | 701,992 | $13.9M | 0.04% | +7,010+1.0% | Added |
| AltraVue Capital, LLC | 693,000 | $13.7M | 1.13% | +693,000 | New |
| Goldman Sachs Group Inc | 593,888 | $11.8M | 0.00% | +68,990+13.1% | Added |
| Tieton Capital Management, LLC | 524,935 | $10.4M | 3.56% | +524,935 | New |
| FMR LLC | 383,212 | $7.60M | 0.00% | +58,532+18.0% | Added |
| Nuveen, LLC | 346,779 | $6.87M | 0.00% | +238,035+218.9% | Added |
| Charles Schwab Investment Management Inc | 329,398 | $6.53M | 0.00% | +41,943+14.6% | Added |
| Northern Trust Corp | 324,313 | $6.43M | 0.00% | +14,614+4.7% | Added |
| Dimensional Fund Advisors LP | 288,028 | $5.71M | 0.00% | +288,028 | New |
| Alliancebernstein L.P. | 254,219 | $5.04M | 0.00% | +213,489+524.2% | Added |
| Two Sigma Investments, LP | 252,845 | $5.01M | 0.01% | +46,976+22.8% | Added |
| Marshall Wace, LLP | 251,512 | $4.98M | 0.00% | −25,588−9.2% | Reduced |
| Renaissance Technologies LLC | 251,274 | $4.98M | 0.01% | +140,374+126.6% | Added |
| Morgan Stanley | 242,132 | $4.80M | 0.00% | +120,063+98.4% | Added |
| American Century Companies Inc | 221,855 | $4.40M | 0.00% | +84,542+61.6% | Added |
| Bridgeway Capital Management, LLC | 193,150 | $3.83M | 0.08% | +78,338+68.2% | Added |
| Hennessy Advisors Inc | 181,000 | $3.59M | 0.13% | −4,000−2.2% | Reduced |
| EJF Capital LLC | 174,979 | $3.47M | 1.97% | +2,176+1.3% | Added |
| Legato Capital Management LLC | 171,361 | $3.40M | 0.29% | +171,361 | New |
| Empowered Funds, LLC | 153,150 | $3.04M | 0.05% | +73,338+91.9% | Added |
| Panagora Asset Management Inc | 150,391 | $2.98M | 0.01% | −22,271−12.9% | Reduced |
| Bank of New York Mellon Corp | 149,221 | $2.96M | 0.00% | +50,391+51.0% | Added |
| UBS Group AG | 146,094 | $2.90M | 0.00% | −232,259−61.4% | Reduced |
| New York State Common Retirement Fund | 144,385 | $2.86M | 0.00% | +134,385+1,343.9% | Added |
| SEI Investments Co | 143,784 | $2.85M | 0.00% | +120,281+511.8% | Added |
| First Trust Advisors LP | 142,087 | $2.82M | 0.00% | +16,618+13.2% | Added |
| Two Sigma Advisers, LP | 140,001 | $2.77M | 0.01% | +5,901+4.4% | Added |
| Financial Engines Advisors L.L.C. | 117,707 | $2.33M | 0.00% | −11,581−9.0% | Reduced |
| Mangrove Partners | 111,356 | $2.21M | 0.18% | −2,761−2.4% | Reduced |
| Citadel Advisors LLC | 106,457 | $2.11M | 0.00% | +47,130+79.4% | Added |
| AQR Capital Management LLC | 105,011 | $2.08M | 0.00% | +23,442+28.7% | Added |
| Colony Group, LLC | 91,366 | $1.81M | 0.00% | +5,954+7.0% | Added |
| Bank of America Corp | 90,641 | $1.80M | 0.00% | +25,221+38.6% | Added |
| International Assets Investment Management, LLC | 86,900 | $1.72M | 0.12% | 00.0% | Unchanged |
| Oppenheimer & Close, LLC | 82,999 | $1.65M | 1.12% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 90,370 | $1.64M | 0.01% | +43,690+93.6% | Added |
| Jane Street Group, LLC | 81,641 | $1.62M | 0.00% | +27,450+50.7% | Added |
| Ameriprise Financial Inc | 78,600 | $1.56M | 0.00% | +200+0.3% | Added |
| Swiss National Bank | 77,100 | $1.53M | 0.00% | +13,600+21.4% | Added |
| BNP Paribas Arbitrage, SA | 70,879 | $1.40M | 0.00% | +44,432+168.0% | Added |
| Barclays PLC | 70,772 | $1.40M | 0.00% | +17,894+33.8% | Added |
| Stilwell Value LLC | 65,000 | $1.29M | 0.71% | −15,000−18.8% | Reduced |
| Principal Financial Group Inc | 64,469 | $1.28M | 0.00% | +20,379+46.2% | Added |
| Invesco Ltd. | 63,337 | $1.26M | 0.00% | +10,461+19.8% | Added |
| Legal & General Group Plc | 60,616 | $1.20M | 0.00% | −1,398−2.3% | Reduced |
| JPMorgan Chase & Co | 59,213 | $1.17M | 0.00% | −60,469−50.5% | Reduced |
| Millennium Management LLC | 54,866 | $1.09M | 0.00% | −488,416−89.9% | Reduced |
| Lynch & Associates | 54,334 | $1.08M | 0.20% | −2,000−3.6% | Reduced |
| Creative Planning | 52,495 | $1.04M | 0.00% | +23,825+83.1% | Added |
| Rhumbline Advisers | 52,211 | $1.03M | 0.00% | −966−1.8% | Reduced |
| Lazard Asset Management LLC | 52,160 | $1.03M | 0.00% | +390+0.8% | Added |
| Round Rock Advisors, LLC | 51,906 | $1.03M | 0.15% | +17,936+52.8% | Added |
| Nixon Peabody Trust Co | 48,516 | $961.6K | 0.07% | +48,516 | New |
| Integrated Wealth Concepts LLC | 47,596 | $943.4K | 0.01% | +482+1.0% | Added |
| D. E. Shaw & Co., Inc. | 45,766 | $907.1K | 0.00% | +3,142+7.4% | Added |
| Wells Fargo & Company | 45,419 | $900.2K | 0.00% | +18,566+69.1% | Added |
| Integrated Quantitative Investments LLC | 40,944 | $811.5K | 0.17% | +26,402+181.6% | Added |
| Price T Rowe Associates Inc | 39,493 | $783.0K | 0.00% | +20,933+112.8% | Added |
| UBS Asset Management Americas Inc | 39,192 | $776.8K | 0.00% | +167+0.4% | Added |
| Verition Fund Management LLC | 38,264 | $758.4K | 0.00% | +3,397+9.7% | Added |
| Aviance Capital Partners, LLC | 37,167 | $736.6K | 0.08% | 00.0% | Unchanged |
| Mariner, LLC | 36,366 | $720.8K | 0.00% | +24,003+194.2% | Added |
| California State Teachers Retirement System | 36,093 | $715.4K | 0.00% | +6,929+23.8% | Added |
| Federated Hermes, Inc. | 34,237 | $678.6K | 0.00% | +27,454+404.7% | Added |
| Occudo Quantitative Strategies LP | 32,155 | $637.3K | 0.04% | +13,594+73.2% | Added |
| Susquehanna Fundamental Investments, LLC | 29,022 | $575.2K | 0.02% | +12,071+71.2% | Added |
| Raffles Associates LP | 28,374 | $562.4K | 0.42% | −2,762−8.9% | Reduced |
| Brandywine Global Investment Management, LLC | 27,470 | $544.5K | 0.00% | +27,470 | New |
| State of Wisconsin Investment Board | 26,641 | $528.0K | 0.00% | +26,641 | New |
| Belvedere Trading LLC | 26,577 | $526.8K | 0.10% | +26,577 | New |
| Susquehanna Portfolio Strategies, LLC | 25,370 | $502.8K | 0.01% | −1,942−7.1% | Reduced |
| Deutsche Bank AG | 25,025 | $496.0K | 0.00% | +4,843+24.0% | Added |
| LPL Financial LLC | 24,328 | $482.2K | 0.00% | +6,336+35.2% | Added |
| Rafferty Asset Management, LLC | 24,196 | $479.6K | 0.00% | −28,472−54.1% | Reduced |
| Quantinno Capital Management LP | 23,321 | $462.2K | 0.00% | +23,321 | New |
| MetLife Investment Management | 23,122 | $458.3K | 0.00% | −633−2.7% | Reduced |
| Northeast Investment Management | 23,000 | $455.9K | 0.02% | +7,000+43.8% | Added |
| Citigroup Inc | 22,885 | $453.6K | 0.00% | −12,706−35.7% | Reduced |
| Modera Wealth Management, LLC | 22,011 | $436.3K | 0.01% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 21,496 | $426.0K | 0.00% | +21,496 | New |
| Four Tree Island Advisory LLC | 21,456 | $425.3K | 0.23% | +21,456 | New |
| ExodusPoint Capital Management, LP | 20,963 | $415.5K | 0.00% | −5,967−22.2% | Reduced |
| Point72 Asset Management, L.P. | 20,905 | $414.3K | 0.00% | +8,580+69.6% | Added |
| Investment Advisory Group, LLC | 20,000 | $396.4K | 0.10% | 00.0% | Unchanged |
| Wiley Bros.-Aintree Capital, LLC | 19,830 | $393.0K | 0.00% | +10+0.1% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 19,759 | $391.6K | 0.00% | +19,759 | New |
| Kestra Private Wealth Services, LLC | 19,700 | $390.5K | 0.00% | +36+0.2% | Added |
| Arrowstreet Capital, Limited Partnership | 18,866 | $373.9K | 0.00% | +18,866 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 18,550 | $367.7K | 0.00% | +2,279+14.0% | Added |
| NewEdge Wealth, LLC | 18,418 | $365.0K | 0.00% | +18,418 | New |
| Qube Research & Technologies Ltd | 17,352 | $343.9K | 0.00% | −69,523−80.0% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 16,846 | $333.9K | 0.00% | +165+1.0% | Added |
| Mercer Global Advisors Inc | 16,698 | $331.0K | 0.00% | +16,698 | New |
| Y-Intercept (Hong Kong) Ltd | 16,681 | $330.6K | 0.01% | +16,681 | New |