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, Q2 2026
Institutional positions in NB Bancorp, Inc. as of Jun 30, 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
- 161
- −13 vs. Q1 2026
- Shares held
- 22.5M
- −594.8K (−2.6%) vs. Q1 2026
- Total value
- $474.9M
- −$11.0M (−2.3%) vs. Q1 2026
- New holders
- 13
- 68 more added
- Sold out
- 26
- 49 more reduced
3 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding NB Bancorp, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Trexquant Investment LP | 46,312 | $978.6K | 0.01% | +46,312 | New |
| Citigroup Inc | 46,580 | $984.2K | 0.00% | +13,129+39.2% | Added |
| Ameriprise Financial Inc | 46,899 | $991.0K | 0.00% | +4,940+11.8% | Added |
| Integrated Wealth Concepts LLC | 47,691 | $1.01M | 0.01% | −236−0.5% | Reduced |
| Nixon Peabody Trust Co | 48,516 | $1.03M | 0.07% | 00.0% | Unchanged |
| Bank of America Corp | 48,905 | $1.03M | 0.00% | −69,896−58.8% | Reduced |
| Stilwell Value LLC | 50,000 | $1.06M | 0.61% | −15,000−23.1% | Reduced |
| Lynch & Associates | 50,334 | $1.06M | 0.19% | −3,000−5.6% | Reduced |
| Rhumbline Advisers | 52,690 | $1.11M | 0.00% | −485−0.9% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 54,541 | $1.15M | 0.02% | +54,541 | New |
| Legal & General Group Plc | 56,718 | $1.20M | 0.00% | +3,710+7.0% | Added |
| Principal Financial Group Inc | 59,231 | $1.25M | 0.00% | +3,867+7.0% | Added |
| BNP Paribas Arbitrage, SA | 62,478 | $1.32M | 0.00% | +9,473+17.9% | Added |
| Colony Group, LLC | 65,728 | $1.39M | 0.00% | −27,081−29.2% | Reduced |
| Round Rock Advisors, LLC | 66,530 | $1.41M | 0.18% | +63+0.1% | Added |
| Creative Planning | 67,320 | $1.42M | 0.00% | −3,586−5.1% | Reduced |
| Mackenzie Financial Corp | 67,441 | $1.43M | 0.00% | +16,544+32.5% | Added |
| Credit Agricole S A | 70,000 | $1.48M | 0.00% | 00.0% | Unchanged |
| Swiss National Bank | 77,100 | $1.63M | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 81,447 | $1.72M | 0.00% | −76,796−48.5% | Reduced |
| Oppenheimer & Close, LLC | 82,999 | $1.75M | 1.11% | 00.0% | Unchanged |
| Invesco Ltd. | 97,941 | $2.07M | 0.00% | −3,303−3.3% | Reduced |
| Mangrove Partners | 111,356 | $2.35M | 0.15% | 00.0% | Unchanged |
| AQR Capital Management LLC | 116,349 | $2.46M | 0.00% | −12,472−9.7% | Reduced |
| Marshall Wace, LLP | 123,112 | $2.60M | 0.00% | +123,112 | New |
| Financial Engines Advisors L.L.C. | 126,788 | $2.68M | 0.00% | +1,065+0.8% | Added |
| Qube Research & Technologies Ltd | 127,236 | $2.69M | 0.00% | −47,830−27.3% | Reduced |
| Panagora Asset Management Inc | 129,355 | $2.73M | 0.01% | −20,741−13.8% | Reduced |
| Alliancebernstein L.P. | 130,219 | $2.74M | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 131,440 | $2.78M | 0.00% | −132,466−50.2% | Reduced |
| International Assets Investment Management, LLC | 131,013 | $2.83M | 0.17% | 00.0% | Unchanged |
| UBS Group AG | 140,405 | $2.97M | 0.00% | +64,285+84.5% | Added |
| First Trust Advisors LP | 142,253 | $3.01M | 0.00% | +1,989+1.4% | Added |
| SEI Investments Co | 142,346 | $3.01M | 0.00% | −159,835−52.9% | Reduced |
| D. E. Shaw & Co., Inc. | 149,931 | $3.17M | 0.00% | +79,546+113.0% | Added |
| Bank of New York Mellon Corp | 171,541 | $3.62M | 0.00% | +23,475+15.9% | Added |
| Hennessy Advisors Inc | 178,000 | $3.76M | 0.12% | −2,000−1.1% | Reduced |
| Empowered Funds, LLC | 181,399 | $3.83M | 0.02% | +13,005+7.7% | Added |
| Bridgeway Capital Management, LLC | 221,399 | $4.68M | 0.08% | +13,005+6.2% | Added |
| Morgan Stanley | 229,194 | $4.84M | 0.00% | −50,676−18.1% | Reduced |
| Vanguard Fiduciary Trust Co | 253,951 | $5.37M | 0.00% | −870.0% | Reduced |
| American Century Companies Inc | 261,866 | $5.53M | 0.00% | −1,790−0.7% | Reduced |
| Two Sigma Investments, LP | 277,027 | $5.85M | 0.00% | −94,780−25.5% | Reduced |
| Citadel Advisors LLC | 289,814 | $6.12M | 0.00% | +173,443+149.0% | Added |
| Charles Schwab Investment Management Inc | 318,612 | $6.73M | 0.00% | +247+0.1% | Added |
| New York State Common Retirement Fund | 346,155 | $7.31M | 0.01% | +85,570+32.8% | Added |
| Northern Trust Corp | 360,492 | $7.62M | 0.00% | +25,132+7.5% | Added |
| Legato Capital Management LLC | 366,090 | $7.74M | 0.64% | +90,020+32.6% | Added |
| Vanguard Portfolio Management LLC | 397,046 | $8.39M | 0.00% | +10,914+2.8% | Added |
| FMR LLC | 497,305 | $10.5M | 0.00% | +59,580+13.6% | Added |
| Nuveen, LLC | 498,869 | $10.5M | 0.00% | +10,836+2.2% | Added |
| Hotchkis & Wiley Capital Management LLC | 501,172 | $10.6M | 0.03% | +50,400+11.2% | Added |
| Tieton Capital Management, LLC | 546,600 | $11.6M | 3.32% | −6,970−1.3% | Reduced |
| Goldman Sachs Group Inc | 571,954 | $12.1M | 0.00% | −119,714−17.3% | Reduced |
| Dimensional Fund Advisors LP | 753,320 | $15.9M | 0.00% | +230,936+44.2% | Added |
| Geode Capital Management, LLC | 1,153,217 | $24.4M | 0.00% | +54,287+4.9% | Added |
| State Street Corp | 1,471,766 | $31.1M | 0.00% | +178,228+13.8% | Added |
| Pertento Partners LLP | 1,475,770 | $31.2M | 2.24% | −730,896−33.1% | Reduced |
| AltraVue Capital, LLC | 1,655,108 | $35.0M | 2.52% | +351,028+26.9% | Added |
| Vanguard Capital Management LLC | 1,670,835 | $35.3M | 0.00% | −33,093−1.9% | Reduced |
| BlackRock, Inc. | 3,331,544 | $70.4M | 0.00% | +247,322+8.0% | Added |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −710,000−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −60,669−100.0% | Sold out |
| OP Asset Management Ltd | 0 | $0 | 0.00% | −58,392−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −57,302−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −51,593−100.0% | Sold out |
| Integrated Quantitative Investments LLC | 0 | $0 | 0.00% | −37,075−100.0% | Sold out |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −32,249−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −27,840−100.0% | Sold out |
| Los Angeles Capital Management LLC | 0 | $0 | 0.00% | −25,375−100.0% | Sold out |
| Four Tree Island Advisory LLC | 0 | $0 | 0.00% | −25,011−100.0% | Sold out |
| Martingale Asset Management L P | 0 | $0 | 0.00% | −23,900−100.0% | Sold out |
| Polymer Capital Management (US) LLC | 0 | $0 | 0.00% | −17,866−100.0% | Sold out |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0 | $0 | 0.00% | −16,846−100.0% | Sold out |
| Diversified Trust Co | 0 | $0 | 0.00% | −13,194−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −10,703−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −10,536−100.0% | Sold out |
| Intech Investment Management LLC | 0 | $0 | 0.00% | −9,892−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −9,040−100.0% | Sold out |
| Globeflex Capital L P | 0 | $0 | 0.00% | −6,791−100.0% | Sold out |
| Resources Management Corp | 0 | $0 | 0.00% | −1,500−100.0% | Sold out |
| Northwestern Mutual Wealth Management Co | 0 | $0 | 0.00% | −232−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −105−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −57−100.0% | Sold out |
| Versant Capital Management, Inc | 0 | $0 | 0.00% | −15−100.0% | Sold out |
| Hughes Financial Services, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Janus Henderson Group PLC | – | – | – | – | Not filed |
| CWM, LLC | – | – | – | – | Not filed |
| Sunbelt Securities, Inc. | – | – | – | – | Not filed |