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, Q3 2025
Institutional positions in NB Bancorp, Inc. as of Sep 30, 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
- 146
- +14 vs. Q2 2025
- Shares held
- 19.2M
- +474.2K (+2.5%) vs. Q2 2025
- Total value
- $338.8M
- +$4.44M (+1.3%) vs. Q2 2025
- New holders
- 27
- 45 more added
- Sold out
- 13
- 45 more reduced
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding NB Bancorp, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Jane Street Group, LLC | 54,191 | $956.5K | 0.00% | +27,507+103.1% | Added |
| Lynch & Associates | 56,334 | $994.3K | 0.19% | −517−0.9% | Reduced |
| Citadel Advisors LLC | 59,327 | $1.05M | 0.00% | +40,432+214.0% | Added |
| Legal & General Group Plc | 62,014 | $1.09M | 0.00% | 00.0% | Unchanged |
| Swiss National Bank | 63,500 | $1.12M | 0.00% | −12,400−16.3% | Reduced |
| Bank of America Corp | 65,420 | $1.15M | 0.00% | −64,532−49.7% | Reduced |
| Trexquant Investment LP | 73,724 | $1.30M | 0.01% | +21,943+42.4% | Added |
| Ameriprise Financial Inc | 78,400 | $1.38M | 0.00% | −10,500−11.8% | Reduced |
| Empowered Funds, LLC | 79,812 | $1.41M | 0.01% | +79,812 | New |
| Stilwell Value LLC | 80,000 | $1.41M | 0.66% | 00.0% | Unchanged |
| AQR Capital Management LLC | 81,569 | $1.44M | 0.00% | +34,273+72.5% | Added |
| Oppenheimer & Close, LLC | 82,999 | $1.46M | 0.99% | 00.0% | Unchanged |
| Colony Group, LLC | 85,412 | $1.51M | 0.00% | +59+0.1% | Added |
| Cubist Systematic Strategies, LLC | 85,522 | $1.51M | 0.02% | +11,608+15.7% | Added |
| Qube Research & Technologies Ltd | 86,875 | $1.53M | 0.00% | −13,797−13.7% | Reduced |
| International Assets Investment Management, LLC | 86,900 | $1.59M | 0.13% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 98,830 | $1.74M | 0.00% | −4,706−4.5% | Reduced |
| Nuveen, LLC | 108,744 | $1.92M | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 110,900 | $1.96M | 0.00% | −33,248−23.1% | Reduced |
| Mangrove Partners | 114,117 | $2.01M | 0.17% | +10,374+10.0% | Added |
| Bridgeway Capital Management, LLC | 114,812 | $2.03M | 0.04% | +114,812 | New |
| JPMorgan Chase & Co | 119,682 | $2.11M | 0.00% | +19,616+19.6% | Added |
| Morgan Stanley | 122,069 | $2.15M | 0.00% | −12,268−9.1% | Reduced |
| First Trust Advisors LP | 125,469 | $2.21M | 0.00% | +99,165+377.0% | Added |
| Financial Engines Advisors L.L.C. | 129,288 | $2.28M | 0.00% | +10,989+9.3% | Added |
| Two Sigma Advisers, LP | 134,100 | $2.37M | 0.00% | +44,400+49.5% | Added |
| American Century Companies Inc | 137,313 | $2.42M | 0.00% | +75,378+121.7% | Added |
| Prospector Partners LLC | 150,862 | $2.66M | 0.32% | −16,760−10.0% | Reduced |
| Panagora Asset Management Inc | 172,662 | $3.05M | 0.01% | −52,919−23.5% | Reduced |
| EJF Capital LLC | 172,803 | $3.05M | 1.77% | +4,973+3.0% | Added |
| Hennessy Advisors Inc | 185,000 | $3.27M | 0.11% | +5,000+2.8% | Added |
| Two Sigma Investments, LP | 205,869 | $3.63M | 0.01% | +64,635+45.8% | Added |
| Marshall Wace, LLP | 277,100 | $4.89M | 0.01% | −38,360−12.2% | Reduced |
| Charles Schwab Investment Management Inc | 287,455 | $5.07M | 0.00% | −11,532−3.9% | Reduced |
| Northern Trust Corp | 309,699 | $5.47M | 0.00% | −7,062−2.2% | Reduced |
| FMR LLC | 324,680 | $5.73M | 0.00% | +23,403+7.8% | Added |
| UBS Group AG | 378,353 | $6.68M | 0.00% | +274,511+264.4% | Added |
| Goldman Sachs Group Inc | 524,898 | $9.26M | 0.00% | +50,142+10.6% | Added |
| Millennium Management LLC | 543,282 | $9.59M | 0.01% | −99,789−15.5% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 694,982 | $12.3M | 0.04% | +148,472+27.2% | Added |
| Geode Capital Management, LLC | 876,648 | $15.5M | 0.00% | −6,493−0.7% | Reduced |
| State Street Corp | 1,196,922 | $21.1M | 0.00% | +76,259+6.8% | Added |
| Wellington Management Group LLP | 1,826,939 | $32.2M | 0.01% | −33,650−1.8% | Reduced |
| Vanguard Group Inc | 1,950,135 | $34.4M | 0.00% | −31,861−1.6% | Reduced |
| Pertento Partners LLP | 2,114,336 | $37.3M | 4.55% | 00.0% | Unchanged |
| BlackRock, Inc. | 2,822,125 | $49.8M | 0.00% | −59,232−2.1% | Reduced |
| Farley Capital L.P. | 0 | $0 | 0.00% | −54,586−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −52,620−100.0% | Sold out |
| SummerHaven Investment Management, LLC | 0 | $0 | 0.00% | −50,826−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −28,795−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −16,365−100.0% | Sold out |
| Commonwealth Equity Services, LLC | 0 | $0 | 0.00% | −13,924−100.0% | Sold out |
| PDT Partners, LLC | 0 | $0 | 0.00% | −12,803−100.0% | Sold out |
| Voya Investment Management LLC | 0 | $0 | 0.00% | −11,769−100.0% | Sold out |
| Arizona State Retirement System | 0 | $0 | 0.00% | −11,601−100.0% | Sold out |
| Barry Investment Advisors, LLC | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| Point72 Asia (Singapore) Pte. Ltd. | 0 | $0 | 0.00% | −2,324−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −601−100.0% | Sold out |
| Traub Capital Management LLC | 0 | $0 | 0.00% | −250−100.0% | Sold out |