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 $475.8M 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
- −552.5K (−2.4%) vs. Q1 2026
- Total value
- $475.8M
- −$10.1M (−2.1%) vs. Q1 2026
- New holders
- 13
- 69 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 | $475.8M |
| Q1 2026 | 177 | $486.3M |
| Q4 2025 | 164 | $441.3M |
| Q3 2025 | 146 | $341.0M |
| Q2 2025 | 132 | $334.7M |
| Q1 2025 | 122 | $331.5M |
| Q4 2024 | 114 | $328.3M |
| Q3 2024 | 108 | $359.4M |
| Q2 2024 | 92 | $254.6M |
| Q1 2024 | 56 | $134.2M |
| 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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,331,544 | $70.4M | 0.00% | +247,322+8.0% | Added |
| Vanguard Capital Management LLC | 1,670,835 | $35.3M | 0.00% | −33,093−1.9% | Reduced |
| AltraVue Capital, LLC | 1,655,108 | $35.0M | 2.52% | +351,028+26.9% | Added |
| Pertento Partners LLP | 1,475,770 | $31.2M | 2.24% | −730,896−33.1% | Reduced |
| State Street Corp | 1,471,766 | $31.1M | 0.00% | +178,228+13.8% | Added |
| Geode Capital Management, LLC | 1,153,217 | $24.4M | 0.00% | +54,287+4.9% | Added |
| Dimensional Fund Advisors LP | 753,320 | $15.9M | 0.00% | +230,936+44.2% | Added |
| Goldman Sachs Group Inc | 571,954 | $12.1M | 0.00% | −119,714−17.3% | Reduced |
| Tieton Capital Management, LLC | 546,600 | $11.6M | 3.32% | −6,970−1.3% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 501,172 | $10.6M | 0.03% | +50,400+11.2% | Added |
| Nuveen, LLC | 498,869 | $10.5M | 0.00% | +10,836+2.2% | Added |
| FMR LLC | 497,305 | $10.5M | 0.00% | +59,580+13.6% | Added |
| Vanguard Portfolio Management LLC | 397,046 | $8.39M | 0.00% | +10,914+2.8% | Added |
| Legato Capital Management LLC | 366,090 | $7.74M | 0.64% | +90,020+32.6% | Added |
| Northern Trust Corp | 360,492 | $7.62M | 0.00% | +25,132+7.5% | Added |
| New York State Common Retirement Fund | 346,155 | $7.31M | 0.01% | +85,570+32.8% | Added |
| Charles Schwab Investment Management Inc | 318,612 | $6.73M | 0.00% | +247+0.1% | Added |
| Citadel Advisors LLC | 289,814 | $6.12M | 0.00% | +173,443+149.0% | Added |
| Two Sigma Investments, LP | 277,027 | $5.85M | 0.00% | −94,780−25.5% | Reduced |
| American Century Companies Inc | 261,866 | $5.53M | 0.00% | −1,790−0.7% | Reduced |
| Vanguard Fiduciary Trust Co | 253,951 | $5.37M | 0.00% | −870.0% | Reduced |
| Morgan Stanley | 229,194 | $4.84M | 0.00% | −50,676−18.1% | Reduced |
| Bridgeway Capital Management, LLC | 221,399 | $4.68M | 0.08% | +13,005+6.2% | Added |
| Empowered Funds, LLC | 181,399 | $3.83M | 0.02% | +13,005+7.7% | Added |
| Hennessy Advisors Inc | 178,000 | $3.76M | 0.12% | −2,000−1.1% | Reduced |
| Bank of New York Mellon Corp | 171,541 | $3.62M | 0.00% | +23,475+15.9% | Added |
| D. E. Shaw & Co., Inc. | 149,931 | $3.17M | 0.00% | +79,546+113.0% | Added |
| SEI Investments Co | 142,346 | $3.01M | 0.00% | −159,835−52.9% | Reduced |
| First Trust Advisors LP | 142,253 | $3.01M | 0.00% | +1,989+1.4% | Added |
| UBS Group AG | 140,405 | $2.97M | 0.00% | +64,285+84.5% | Added |
| International Assets Investment Management, LLC | 131,013 | $2.83M | 0.17% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 131,440 | $2.78M | 0.00% | −132,466−50.2% | Reduced |
| Alliancebernstein L.P. | 130,219 | $2.74M | 0.00% | 00.0% | Unchanged |
| Panagora Asset Management Inc | 129,355 | $2.73M | 0.01% | −20,741−13.8% | Reduced |
| Qube Research & Technologies Ltd | 127,236 | $2.69M | 0.00% | −47,830−27.3% | Reduced |
| Financial Engines Advisors L.L.C. | 126,788 | $2.68M | 0.00% | +1,065+0.8% | Added |
| Marshall Wace, LLP | 123,112 | $2.60M | 0.00% | +123,112 | New |
| AQR Capital Management LLC | 116,349 | $2.46M | 0.00% | −12,472−9.7% | Reduced |
| Mangrove Partners | 111,356 | $2.35M | 0.15% | 00.0% | Unchanged |
| Invesco Ltd. | 97,941 | $2.07M | 0.00% | −3,303−3.3% | Reduced |
| Oppenheimer & Close, LLC | 82,999 | $1.75M | 1.11% | 00.0% | Unchanged |
| Millennium Management LLC | 81,447 | $1.72M | 0.00% | −76,796−48.5% | Reduced |
| Swiss National Bank | 77,100 | $1.63M | 0.00% | 00.0% | Unchanged |
| Credit Agricole S A | 70,000 | $1.48M | 0.00% | 00.0% | Unchanged |
| Mackenzie Financial Corp | 67,441 | $1.43M | 0.00% | +16,544+32.5% | Added |
| Creative Planning | 67,320 | $1.42M | 0.00% | −3,586−5.1% | Reduced |
| Round Rock Advisors, LLC | 66,530 | $1.41M | 0.18% | +63+0.1% | Added |
| Colony Group, LLC | 65,728 | $1.39M | 0.00% | −27,081−29.2% | Reduced |
| Raffles Associates LP | 63,748 | $1.35M | 0.59% | +48,874+328.6% | Added |
| BNP Paribas Arbitrage, SA | 62,478 | $1.32M | 0.00% | +9,473+17.9% | Added |
| Principal Financial Group Inc | 59,231 | $1.25M | 0.00% | +3,867+7.0% | Added |
| Legal & General Group Plc | 56,718 | $1.20M | 0.00% | +3,710+7.0% | Added |
| Y-Intercept (Hong Kong) Ltd | 54,541 | $1.15M | 0.02% | +54,541 | New |
| Rhumbline Advisers | 52,690 | $1.11M | 0.00% | −485−0.9% | Reduced |
| Lynch & Associates | 50,334 | $1.06M | 0.19% | −3,000−5.6% | Reduced |
| Stilwell Value LLC | 50,000 | $1.06M | 0.61% | −15,000−23.1% | Reduced |
| Bank of America Corp | 48,905 | $1.03M | 0.00% | −69,896−58.8% | Reduced |
| Nixon Peabody Trust Co | 48,516 | $1.03M | 0.07% | 00.0% | Unchanged |
| Integrated Wealth Concepts LLC | 47,691 | $1.01M | 0.01% | −236−0.5% | Reduced |
| Ameriprise Financial Inc | 46,899 | $991.0K | 0.00% | +4,940+11.8% | Added |
| Citigroup Inc | 46,580 | $984.2K | 0.00% | +13,129+39.2% | Added |
| Trexquant Investment LP | 46,312 | $978.6K | 0.01% | +46,312 | New |
| Price T Rowe Associates Inc | 46,016 | $973.0K | 0.00% | +4,944+12.0% | Added |
| Federated Hermes, Inc. | 44,967 | $950.2K | 0.00% | +11,068+32.6% | Added |
| Quantinno Capital Management LP | 44,137 | $932.6K | 0.00% | +18,196+70.1% | Added |
| Wedge Capital Management L L P | 43,216 | $913.2K | 0.02% | +860+2.0% | Added |
| Mariner, LLC | 42,471 | $897.4K | 0.00% | −7,024−14.2% | Reduced |
| XTX Topco Ltd | 41,912 | $885.6K | 0.01% | +2,130+5.4% | Added |
| Deutsche Bank AG | 41,024 | $866.8K | 0.00% | +9,918+31.9% | Added |
| EJF Capital LLC | 40,751 | $861.1K | 0.58% | −706−1.7% | Reduced |
| California State Teachers Retirement System | 39,017 | $824.4K | 0.00% | +3,220+9.0% | Added |
| UBS Asset Management Americas Inc | 38,359 | $810.5K | 0.00% | −1,003−2.5% | Reduced |
| Aviance Capital Partners, LLC | 38,173 | $806.6K | 0.08% | +1,006+2.7% | Added |
| State of Wisconsin Investment Board | 38,169 | $806.5K | 0.00% | +13,783+56.5% | Added |
| Arrowstreet Capital, Limited Partnership | 35,981 | $760.3K | 0.00% | −4,295−10.7% | Reduced |
| Wells Fargo & Company | 35,185 | $743.5K | 0.00% | +19,028+117.8% | Added |
| Bleakley Financial Group, LLC | 34,272 | $724.2K | 0.01% | +20,709+152.7% | Added |
| Allspring Global Investments Holdings, LLC | 30,429 | $657.9K | 0.00% | +955+3.2% | Added |
| Raymond James Financial Inc | 29,914 | $632.1K | 0.00% | +19,967+200.7% | Added |
| Franklin Resources Inc | 28,370 | $599.5K | 0.00% | +1,100+4.0% | Added |
| LPL Financial LLC | 26,409 | $558.0K | 0.00% | +49+0.2% | Added |
| Rafferty Asset Management, LLC | 25,529 | $539.4K | 0.00% | −4,469−14.9% | Reduced |
| Northeast Investment Management | 25,000 | $528.3K | 0.02% | 00.0% | Unchanged |
| Vanguard Global Advisers, LLC | 24,444 | $516.5K | 0.00% | +930+4.0% | Added |
| MetLife Investment Management | 24,072 | $508.6K | 0.00% | +1,266+5.6% | Added |
| Barclays PLC | 23,951 | $506.1K | 0.00% | +852+3.7% | Added |
| Vanguard Asset Management, Ltd | 23,484 | $496.2K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 21,332 | $450.7K | 0.00% | +16,988+391.1% | Added |
| Cambridge Investment Research Advisors, Inc. | 20,730 | $438.0K | 0.00% | +10,365+100.0% | Added |
| Mirabella Financial Services LLP | 20,227 | $427.4K | 0.04% | +20,227 | New |
| Investment Advisory Group, LLC | 20,000 | $422.6K | 0.09% | 00.0% | Unchanged |
| Wiley Bros.-Aintree Capital, LLC | 19,730 | $416.9K | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 19,283 | $408.6K | 0.00% | −16,805−46.6% | Reduced |
| Commonwealth Equity Services, LLC | 19,285 | $407.5K | 0.00% | −3,207−14.3% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 18,740 | $396.0K | 0.00% | +47+0.3% | Added |
| Harbor Advisors LLC | 17,500 | $369.8K | 0.05% | +7,500+75.0% | Added |
| Mercer Global Advisors Inc | 16,992 | $359.0K | 0.00% | +5,289+45.2% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 16,976 | $358.7K | 0.00% | 00.0% | Unchanged |
| Kestra Private Wealth Services, LLC | 16,766 | $354.3K | 0.00% | −965−5.4% | Reduced |
| Rockland Trust Co | 15,969 | $337.4K | 0.01% | 00.0% | Unchanged |