NB BancorpNBBK
13F holders, Q1 2026 (March 31)177holders +13
26new positions
15sold out
5famous investors
$21.06avg. 13F price*
At the end of Q1 2026, 177 institutions reported holding NB Bancorp Inc. (NBBK) in their 13F filings, up 13 from Q4 2025. 26 opened new positions and 15 sold out. The largest holders were BlackRock, Inc. ($65.0M), Pertento Partners LLP ($46.5M) and Vanguard Capital Management LLC ($35.9M). 5 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- NB Bancorp Inc.
- CUSIP
- 63945M107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 26 | $10.2M |
| Exits | 15 | $9.6M |
All 13F filers, Q4 2025 → Q1 2026: 3,194,292 shares bought and 2,304,484 shares sold, net +889,808 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 177 holders
| BlackRock, Inc. | 0.00% | Reduce -0.6% | 3,084,222 | $65.0M |
| Pertento Partners LLP | 4.93% | Reduce -5.8% | 2,206,666 | $46.5M |
| Vanguard Capital Management LLC | 0.00% | — | 1,703,928 | $35.9M |
| AltraVue Capital, LLC | 2.37% | Add +88.2% | 1,304,080 | $27.5M |
| State Street Corp. | 0.00% | Add +16.1% | 1,293,538 | $27.3M |
| Geode Capital Management, LLC | 0.00% | Add +13.7% | 1,098,930 | $23.2M |
| Wellington Management Group LLP | 0.00% | Reduce -51.7% | 710,000 | $15.0M |
| Goldman Sachs Group Inc. | 0.00% | Add +16.5% | 691,668 | $14.6M |
| Tieton Capital Management, LLC | 3.91% | Add +5.5% | 553,570 | $11.7M |
| Dimensional Fund Advisors LP | 0.00% | Add +81.4% | 522,384 | $11.0M |
| Nuveen, LLC | 0.00% | Add +40.7% | 488,033 | $10.3M |
| Hotchkis & Wiley Capital Management LLC | 0.03% | Reduce -35.8% | 450,772 | $9.5M |
| FMR LLC | 0.00% | Add +14.2% | 437,725 | $9.2M |
| Vanguard Portfolio Management LLC | 0.00% | — | 386,132 | $8.1M |
| Two Sigma Investments, LP | 0.01% | Add +47.0% | 371,807 | $7.8M |
| Northern Trust Corp. | 0.00% | Add +3.4% | 335,360 | $7.1M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -3.4% | 318,365 | $6.7M |
| Sei Investments Co. | 0.01% | Add +110.2% | 302,181 | $6.4M |
| Morgan Stanley | 0.00% | Add +15.6% | 279,870 | $5.9M |
| Legato Capital Management LLC | 0.53% | Add +61.1% | 276,070 | $5.8M |
| Renaissance Technologies | 0.01% | Add +5.0% | 263,906 | $5.6M |
| American Century Companies Inc. | 0.00% | Add +18.8% | 263,656 | $5.6M |
| New York State Common Retirement Fund | 0.01% | Add +80.5% | 260,585 | $5.5M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 254,038 | $5.4M |
| Bridgeway Capital Management, LLC | 0.09% | Add +7.9% | 208,394 | $4.4M |
| Hennessy Advisors Inc. | 0.14% | Reduce -0.6% | 180,000 | $3.8M |
| Qube Research & Technologies Ltd | 0.01% | Add +908.9% | 175,066 | $3.7M |
| Empowered Funds, LLC | 0.02% | Add +9.9% | 168,394 | $3.5M |
| Millennium Management | 0.00% | Add +188.4% | 158,243 | $3.3M |
| Panagora Asset Management Inc. | 0.01% | Reduce -0.2% | 150,096 | $3.2M |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.8% | 148,066 | $3.1M |
| First Trust Advisors LP | 0.00% | Reduce -1.3% | 140,264 | $3.0M |
| International Assets Investment Management, LLC | 0.19% | Add +50.8% | 131,013 | $2.8M |
| AQR Capital Management | 0.00% | Add +22.7% | 128,821 | $2.7M |
| Financial Engines Advisors L.L.C. | 0.01% | Add +6.8% | 125,723 | $2.6M |
| Alliancebernstein L.P. | 0.00% | Reduce -48.8% | 130,219 | $2.6M |
| Bank of America Corp. | 0.00% | Add +31.1% | 118,801 | $2.5M |
| Citadel Advisors | 0.00% | Add +9.3% | 116,371 | $2.5M |
| Mangrove Partners Im, LLC | 0.19% | No change | 111,356 | $2.3M |
| Invesco Ltd. | 0.00% | Add +59.9% | 101,244 | $2.1M |
| Focus Partners Wealth | 0.00% | Add +1.6% | 92,809 | $2.0M |
| Oppenheimer & Close, LLC | 1.10% | No change | 82,999 | $1.7M |
| Swiss National Bank | 0.00% | No change | 77,100 | $1.6M |
| UBS Group AG | 0.00% | Reduce -47.9% | 76,120 | $1.6M |
| Creative Planning | 0.00% | Add +35.1% | 70,906 | $1.5M |
| D. E. Shaw & Co. | 0.00% | Add +53.8% | 70,385 | $1.5M |
| Credit Agricole S A | 0.00% | New | 70,000 | $1.5M |
| Round Rock Advisors LLC | 0.21% | Add +28.1% | 66,467 | $1.4M |
| Stilwell Value LLC | 1.51% | No change | 65,000 | $1.4M |
| Jane Street Group, LLC | 0.00% | Reduce -25.7% | 60,669 | $1.3M |
| OP Asset Management Ltd | 0.01% | New | 58,392 | $1.2M |
| Lazard Asset Management LLC | 0.00% | Add +9.9% | 57,302 | $1.2M |
| Principal Financial Group Inc. | 0.00% | Reduce -14.1% | 55,364 | $1.2M |
| Lynch & Associates | 0.21% | Reduce -1.8% | 53,334 | $1.1M |
| Rhumbline Advisers | 0.00% | Add +1.9% | 53,175 | $1.1M |
| Legal & General Group Plc | 0.00% | Reduce -12.6% | 53,008 | $1.1M |
| BNP Paribas Financial Markets | 0.00% | Reduce -25.2% | 53,005 | $1.1M |
| Susquehanna International Group, LLP | 0.00% | New | 51,593 | $1.1M |
| Mackenzie Financial Corp. | 0.00% | New | 50,897 | $1.1M |
| Mariner, LLC | 0.00% | Add +36.1% | 49,495 | $1.0M |
| Nixon Peabody Trust Co. | 0.08% | No change | 48,516 | $1.0M |
| Integrated Wealth Concepts LLC | 0.01% | Add +0.7% | 47,927 | $1.0M |
| Wedge Capital Management L L P | 0.02% | New | 42,356 | $892K |
| Ameriprise Financial Inc. | 0.00% | Reduce -46.6% | 41,959 | $884K |
| EJF Capital LP | 0.62% | Reduce -76.3% | 41,457 | $873K |
| T. Rowe Price Associates Inc. | 0.00% | Add +4.0% | 41,072 | $866K |
| Arrowstreet Capital, Limited Partnership | 0.00% | Add +113.5% | 40,276 | $849K |
| XTX Topco Ltd | 0.01% | New | 39,782 | $838K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +0.4% | 39,362 | $829K |
| Aviance Capital Partners, LLC | 0.09% | No change | 37,167 | $783K |
| Integrated Quantitative Investments LLC | 0.14% | Reduce -9.4% | 37,075 | $781K |
| California State Teachers Retirement System | 0.00% | Reduce -0.8% | 35,797 | $754K |
| JPMorgan Chase & Co. | 0.00% | Reduce -39.0% | 36,088 | $746K |
| Federated Hermes, Inc. | 0.00% | Reduce -1.0% | 33,899 | $714K |
| Citigroup Inc. | 0.00% | Add +46.2% | 33,451 | $705K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Add +63.2% | 32,249 | $679K |
| Deutsche Bank AG | 0.00% | Add +24.3% | 31,106 | $655K |
| Rafferty Asset Management, LLC | 0.00% | Add +24.0% | 29,998 | $632K |
| Allspring Global Investments Holdings, LLC | 0.00% | New | 29,474 | $626K |
| Susquehanna Fundamental Investments, LLC | 0.02% | Reduce -4.1% | 27,840 | $587K |
| Franklin Resources Inc. | 0.00% | New | 27,270 | $575K |
| LPL Financial LLC | 0.00% | Add +8.3% | 26,360 | $555K |
| Quantinno Capital Management LP | 0.00% | Add +11.2% | 25,941 | $547K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -71.9% | 25,375 | $535K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | No change | 25,370 | $535K |
| Four Tree Island Advisory LLC | 0.27% | Add +16.6% | 25,011 | $527K |
| Northeast Investment Management | 0.02% | Add +8.7% | 25,000 | $527K |
| State of Wisconsin Investment Board | 0.00% | Reduce -8.5% | 24,386 | $514K |
| Martingale Asset Management L P | 0.01% | Add +104.3% | 23,900 | $504K |
| Vanguard Global Advisers, LLC | 0.00% | — | 23,514 | $495K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 23,484 | $495K |
| Barclays PLC | 0.00% | Reduce -67.4% | 23,099 | $487K |
| MetLife Investment Management, LLC | 0.00% | Reduce -1.4% | 22,806 | $481K |
| Commonwealth Equity Services, LLC | 0.00% | Add +4.6% | 22,492 | $474K |
| Investment Advisory Group, LLC | 0.11% | No change | 20,000 | $421K |
| &partners | 0.00% | Reduce -0.5% | 19,730 | $416K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +0.8% | 18,693 | $394K |
| Polymer Capital Management (US) LLC | 0.06% | New | 17,866 | $376K |
| Kestra Private Wealth Services, LLC | 0.00% | Reduce -10.0% | 17,731 | $374K |
| Cerity Partners LLC | 0.00% | New | 17,388 | $366K |
"% of holder's portfolio" is NBBK's weight in each manager's 13F, not the share of NB Bancorp Inc. the manager owns.