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 |
|---|---|---|---|---|---|
| Price T Rowe Associates Inc | 39,493 | $783.0K | 0.00% | +20,933+112.8% | Added |
| Integrated Quantitative Investments LLC | 40,944 | $811.5K | 0.17% | +26,402+181.6% | Added |
| Wells Fargo & Company | 45,419 | $900.2K | 0.00% | +18,566+69.1% | Added |
| D. E. Shaw & Co., Inc. | 45,766 | $907.1K | 0.00% | +3,142+7.4% | Added |
| Integrated Wealth Concepts LLC | 47,596 | $943.4K | 0.01% | +482+1.0% | Added |
| Nixon Peabody Trust Co | 48,516 | $961.6K | 0.07% | +48,516 | New |
| Round Rock Advisors, LLC | 51,906 | $1.03M | 0.15% | +17,936+52.8% | Added |
| Lazard Asset Management LLC | 52,160 | $1.03M | 0.00% | +390+0.8% | Added |
| Rhumbline Advisers | 52,211 | $1.03M | 0.00% | −966−1.8% | Reduced |
| Creative Planning | 52,495 | $1.04M | 0.00% | +23,825+83.1% | Added |
| Lynch & Associates | 54,334 | $1.08M | 0.20% | −2,000−3.6% | Reduced |
| Millennium Management LLC | 54,866 | $1.09M | 0.00% | −488,416−89.9% | Reduced |
| JPMorgan Chase & Co | 59,213 | $1.17M | 0.00% | −60,469−50.5% | Reduced |
| Legal & General Group Plc | 60,616 | $1.20M | 0.00% | −1,398−2.3% | Reduced |
| Invesco Ltd. | 63,337 | $1.26M | 0.00% | +10,461+19.8% | Added |
| Principal Financial Group Inc | 64,469 | $1.28M | 0.00% | +20,379+46.2% | Added |
| Stilwell Value LLC | 65,000 | $1.29M | 0.71% | −15,000−18.8% | Reduced |
| Barclays PLC | 70,772 | $1.40M | 0.00% | +17,894+33.8% | Added |
| BNP Paribas Arbitrage, SA | 70,879 | $1.40M | 0.00% | +44,432+168.0% | Added |
| Swiss National Bank | 77,100 | $1.53M | 0.00% | +13,600+21.4% | Added |
| Ameriprise Financial Inc | 78,600 | $1.56M | 0.00% | +200+0.3% | Added |
| Jane Street Group, LLC | 81,641 | $1.62M | 0.00% | +27,450+50.7% | Added |
| Los Angeles Capital Management LLC | 90,370 | $1.64M | 0.01% | +43,690+93.6% | Added |
| Oppenheimer & Close, LLC | 82,999 | $1.65M | 1.12% | 00.0% | Unchanged |
| International Assets Investment Management, LLC | 86,900 | $1.72M | 0.12% | 00.0% | Unchanged |
| Bank of America Corp | 90,641 | $1.80M | 0.00% | +25,221+38.6% | Added |
| Colony Group, LLC | 91,366 | $1.81M | 0.00% | +5,954+7.0% | Added |
| AQR Capital Management LLC | 105,011 | $2.08M | 0.00% | +23,442+28.7% | Added |
| Citadel Advisors LLC | 106,457 | $2.11M | 0.00% | +47,130+79.4% | Added |
| Mangrove Partners | 111,356 | $2.21M | 0.18% | −2,761−2.4% | Reduced |
| Financial Engines Advisors L.L.C. | 117,707 | $2.33M | 0.00% | −11,581−9.0% | Reduced |
| Two Sigma Advisers, LP | 140,001 | $2.77M | 0.01% | +5,901+4.4% | Added |
| First Trust Advisors LP | 142,087 | $2.82M | 0.00% | +16,618+13.2% | Added |
| SEI Investments Co | 143,784 | $2.85M | 0.00% | +120,281+511.8% | Added |
| New York State Common Retirement Fund | 144,385 | $2.86M | 0.00% | +134,385+1,343.9% | Added |
| UBS Group AG | 146,094 | $2.90M | 0.00% | −232,259−61.4% | Reduced |
| Bank of New York Mellon Corp | 149,221 | $2.96M | 0.00% | +50,391+51.0% | Added |
| Panagora Asset Management Inc | 150,391 | $2.98M | 0.01% | −22,271−12.9% | Reduced |
| Empowered Funds, LLC | 153,150 | $3.04M | 0.05% | +73,338+91.9% | Added |
| Legato Capital Management LLC | 171,361 | $3.40M | 0.29% | +171,361 | New |
| EJF Capital LLC | 174,979 | $3.47M | 1.97% | +2,176+1.3% | Added |
| Hennessy Advisors Inc | 181,000 | $3.59M | 0.13% | −4,000−2.2% | Reduced |
| Bridgeway Capital Management, LLC | 193,150 | $3.83M | 0.08% | +78,338+68.2% | Added |
| American Century Companies Inc | 221,855 | $4.40M | 0.00% | +84,542+61.6% | Added |
| Morgan Stanley | 242,132 | $4.80M | 0.00% | +120,063+98.4% | Added |
| Renaissance Technologies LLC | 251,274 | $4.98M | 0.01% | +140,374+126.6% | Added |
| Marshall Wace, LLP | 251,512 | $4.98M | 0.00% | −25,588−9.2% | Reduced |
| Two Sigma Investments, LP | 252,845 | $5.01M | 0.01% | +46,976+22.8% | Added |
| Alliancebernstein L.P. | 254,219 | $5.04M | 0.00% | +213,489+524.2% | Added |
| Dimensional Fund Advisors LP | 288,028 | $5.71M | 0.00% | +288,028 | New |
| Northern Trust Corp | 324,313 | $6.43M | 0.00% | +14,614+4.7% | Added |
| Charles Schwab Investment Management Inc | 329,398 | $6.53M | 0.00% | +41,943+14.6% | Added |
| Nuveen, LLC | 346,779 | $6.87M | 0.00% | +238,035+218.9% | Added |
| FMR LLC | 383,212 | $7.60M | 0.00% | +58,532+18.0% | Added |
| Tieton Capital Management, LLC | 524,935 | $10.4M | 3.56% | +524,935 | New |
| Goldman Sachs Group Inc | 593,888 | $11.8M | 0.00% | +68,990+13.1% | Added |
| AltraVue Capital, LLC | 693,000 | $13.7M | 1.13% | +693,000 | New |
| Hotchkis & Wiley Capital Management LLC | 701,992 | $13.9M | 0.04% | +7,010+1.0% | Added |
| Geode Capital Management, LLC | 966,662 | $19.2M | 0.00% | +90,014+10.3% | Added |
| State Street Corp | 1,114,379 | $22.1M | 0.00% | −82,543−6.9% | Reduced |
| Wellington Management Group LLP | 1,471,189 | $29.2M | 0.01% | −355,750−19.5% | Reduced |
| Vanguard Group Inc | 2,301,034 | $45.6M | 0.00% | +350,899+18.0% | Added |
| Pertento Partners LLP | 2,343,776 | $46.5M | 5.10% | +229,440+10.9% | Added |
| BlackRock, Inc. | 3,103,770 | $61.5M | 0.00% | +281,645+10.0% | Added |
| Prospector Partners LLC | 0 | $0 | 0.00% | −150,862−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −73,724−100.0% | Sold out |
| Victory Capital Management Inc | 0 | $0 | 0.00% | −51,670−100.0% | Sold out |
| Jacobs Levy Equity Management, Inc | 0 | $0 | 0.00% | −41,766−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −27,241−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −25,255−100.0% | Sold out |
| Polymer Capital Management (US) LLC | 0 | $0 | 0.00% | −19,819−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −18,537−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −13,169−100.0% | Sold out |
| Public Employees Retirement System of Ohio | 0 | $0 | 0.00% | −10,788−100.0% | Sold out |
| PharVision Advisers, LLC | 0 | $0 | 0.00% | −10,721−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −8,822−100.0% | Sold out |
| SBI Securities Co., Ltd. | 0 | $0 | 0.00% | −250−100.0% | Sold out |
| Cubist Systematic Strategies, LLC | – | – | – | – | Not filed |
| Point72 (DIFC) Ltd | – | – | – | – | Not filed |
| FSA Wealth Management LLC | – | – | – | – | Not filed |