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, Q1 2026
Institutional positions in NB Bancorp, Inc. as of Mar 31, 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
- 177
- +15 vs. Q4 2025
- Shares held
- 23.1M
- +3.14M (+15.7%) vs. Q4 2025
- Total value
- $486.3M
- +$91.1M (+23.1%) vs. Q4 2025
- New holders
- 32
- 66 more added
- Sold out
- 17
- 44 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding NB Bancorp, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Hughes Financial Services, LLC | 1 | $21 | 0.00% | +1 | New |
| True Wealth Design, LLC | 2 | $43 | 0.00% | 00.0% | Unchanged |
| Sunbelt Securities, Inc. | 5 | $105 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 12 | $253 | 0.00% | +12 | New |
| Versant Capital Management, Inc | 15 | $316 | 0.00% | +15 | New |
| Nisa Investment Advisors, LLC | 18 | $379 | 0.00% | 00.0% | Unchanged |
| Quarry LP | 33 | $695 | 0.00% | −82−71.3% | Reduced |
| Parallel Advisors, LLC | 39 | $822 | 0.00% | 00.0% | Unchanged |
| Signaturefd, LLC | 47 | $990 | 0.00% | +47 | New |
| Covestor Ltd | 34 | $1.00K | 0.00% | −94−73.4% | Reduced |
| American Capital Advisory, LLC | 50 | $1.05K | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 53 | $1.12K | 0.00% | +51+2,550.0% | Added |
| US Bancorp | 53 | $1.12K | 0.00% | +53 | New |
| Smartleaf Asset Management LLC | 56 | $1.16K | 0.00% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 57 | $1.20K | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 57 | $1.20K | 0.00% | 00.0% | Unchanged |
| Root Financial Partners, LLC | 59 | $1.24K | 0.00% | +59 | New |
| MAI Capital Management | 105 | $2.21K | 0.00% | +105 | New |
| Rothschild Investment LLC | 168 | $3.54K | 0.00% | +81+93.1% | Added |
| Optiver Holding B.V. | 172 | $3.62K | 0.00% | −40−18.9% | Reduced |
| IFP Advisors, Inc | 172 | $3.62K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 200 | $4.21K | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 232 | $4.89K | 0.00% | +226+3,766.7% | Added |
| Eastern Bank | 288 | $6.07K | 0.00% | 00.0% | Unchanged |
| Essential Partners LLC | 496 | $10.5K | 0.00% | +2+0.4% | Added |
| GAMMA Investing LLC | 553 | $11.7K | 0.00% | +54+10.8% | Added |
| Stone House Investment Management, LLC | 818 | $17.2K | 0.00% | +818 | New |
| Simplex Trading, LLC | 877 | $18.5K | 0.00% | +877 | New |
| Advisor Group Holdings, Inc. | 1,311 | $27.6K | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 1,315 | $27.7K | 0.00% | +29+2.3% | Added |
| Resources Management Corp | 1,500 | $32.0K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 1,527 | $32.2K | 0.00% | 00.0% | Unchanged |
| Aquatic Capital Management LLC | 1,585 | $33.4K | 0.00% | +1,066+205.4% | Added |
| State of Alaska, Department of Revenue | 1,630 | $34.0K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 2,081 | $43.8K | 0.00% | −435−17.3% | Reduced |
| Ameritas Investment Partners, Inc. | 3,422 | $72.1K | 0.00% | 00.0% | Unchanged |
| SHP Wealth Management | 3,456 | $72.8K | 0.01% | +2+0.1% | Added |
| Larson Financial Group LLC | 3,941 | $83.0K | 0.00% | +312+8.6% | Added |
| Russell Investments Group, Ltd. | 4,344 | $91.5K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 4,743 | $99.9K | 0.00% | +1,101+30.2% | Added |
| Allworth Financial LP | 5,966 | $125.7K | 0.00% | +131+2.2% | Added |
| Pension & Wealth Management Advisors, Inc. | 6,141 | $129.4K | 0.04% | +4,006+187.6% | Added |
| Globeflex Capital L P | 6,791 | $143.1K | 0.02% | +6,791 | New |
| KLP Kapitalforvaltning AS | 8,300 | $174.9K | 0.00% | 00.0% | Unchanged |
| Vanguard Investments Australia, Ltd. | 8,947 | $188.5K | 0.00% | +8,947 | New |
| Acadian Asset Management LLC | 9,040 | $190.0K | 0.00% | −6,677−42.5% | Reduced |
| Intech Investment Management LLC | 9,892 | $208.4K | 0.00% | −4,374−30.7% | Reduced |
| Raymond James Financial Inc | 9,947 | $209.6K | 0.00% | +9,947 | New |
| Pallas Capital Advisors LLC | 9,955 | $209.8K | 0.01% | +9,955 | New |
| Barrett & Company, Inc. | 10,000 | $210.7K | 0.07% | 00.0% | Unchanged |
| Harbor Advisors LLC | 10,000 | $210.7K | 0.03% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 10,024 | $211.0K | 0.00% | −3,065−23.4% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 10,365 | $218.0K | 0.00% | −100−1.0% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 10,491 | $221.0K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 10,536 | $222.0K | 0.01% | +10,536 | New |
| Gray Private Wealth, LLC | 10,588 | $223.1K | 0.11% | 00.0% | Unchanged |
| Arizona State Retirement System | 10,686 | $225.2K | 0.00% | −141−1.3% | Reduced |
| Brevan Howard Capital Management LP | 10,703 | $225.5K | 0.00% | +10,703 | New |
| Manufacturers Life Insurance Company, The | 10,908 | $229.8K | 0.00% | −1,446−11.7% | Reduced |
| Great Oak Capital Partners, LLC | 10,636 | $236.0K | 0.05% | 00.0% | Unchanged |
| Mercer Global Advisors Inc | 11,703 | $246.6K | 0.00% | −4,995−29.9% | Reduced |
| Afg Fiduciary Services Limited Partnership | 11,693 | $255.3K | 0.15% | +723+6.6% | Added |
| Farther Finance Advisors, LLC | 12,018 | $255.4K | 0.00% | +16+0.1% | Added |
| Fifth Third Bancorp | 12,171 | $256.4K | 0.00% | +12,171 | New |
| Diversified Trust Co | 13,194 | $278.0K | 0.01% | +910+7.4% | Added |
| Royal Bank of Canada | 13,268 | $280.0K | 0.00% | +868+7.0% | Added |
| Sterling Capital Management LLC | 13,332 | $280.9K | 0.01% | +11,032+479.7% | Added |
| Bleakley Financial Group, LLC | 13,563 | $285.8K | 0.00% | −102−0.7% | Reduced |
| ExodusPoint Capital Management, LP | 14,437 | $304.2K | 0.00% | −6,526−31.1% | Reduced |
| Janus Henderson Group PLC | 14,800 | $311.8K | 0.00% | 00.0% | Unchanged |
| Raffles Associates LP | 14,874 | $313.4K | 0.27% | −13,500−47.6% | Reduced |
| Flywheel Private Wealth LLC | 15,000 | $316.1K | 0.18% | +15,000 | New |
| Summit Wealth Group, LLC | 15,340 | $323.2K | 0.07% | 00.0% | Unchanged |
| Rockland Trust Co | 15,969 | $336.5K | 0.01% | 00.0% | Unchanged |
| Wells Fargo & Company | 16,157 | $340.4K | 0.00% | −29,262−64.4% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 16,846 | $354.9K | 0.00% | 00.0% | Unchanged |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 16,976 | $357.7K | 0.00% | +7,300+75.4% | Added |
| Cerity Partners LLC | 17,388 | $366.4K | 0.00% | +17,388 | New |
| Kestra Private Wealth Services, LLC | 17,731 | $373.6K | 0.00% | −1,969−10.0% | Reduced |
| Polymer Capital Management (US) LLC | 17,866 | $376.4K | 0.06% | +17,866 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 18,693 | $393.9K | 0.00% | +143+0.8% | Added |
| Wiley Bros.-Aintree Capital, LLC | 19,730 | $415.7K | 0.00% | −100−0.5% | Reduced |
| Investment Advisory Group, LLC | 20,000 | $421.4K | 0.11% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 22,492 | $473.9K | 0.00% | +996+4.6% | Added |
| MetLife Investment Management | 22,806 | $480.5K | 0.00% | −316−1.4% | Reduced |
| Barclays PLC | 23,099 | $486.7K | 0.00% | −47,673−67.4% | Reduced |
| Vanguard Asset Management, Ltd | 23,484 | $494.8K | 0.00% | +23,484 | New |
| Vanguard Global Advisers, LLC | 23,514 | $495.4K | 0.00% | +23,514 | New |
| Martingale Asset Management L P | 23,900 | $503.6K | 0.01% | +12,200+104.3% | Added |
| State of Wisconsin Investment Board | 24,386 | $513.8K | 0.00% | −2,255−8.5% | Reduced |
| Northeast Investment Management | 25,000 | $526.8K | 0.02% | +2,000+8.7% | Added |
| Four Tree Island Advisory LLC | 25,011 | $527.0K | 0.27% | +3,555+16.6% | Added |
| Susquehanna Portfolio Strategies, LLC | 25,370 | $534.5K | 0.01% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 25,375 | $534.7K | 0.00% | −64,995−71.9% | Reduced |
| Quantinno Capital Management LP | 25,941 | $546.6K | 0.00% | +2,620+11.2% | Added |
| LPL Financial LLC | 26,360 | $555.4K | 0.00% | +2,032+8.4% | Added |
| Franklin Resources Inc | 27,270 | $574.6K | 0.00% | +27,270 | New |
| Susquehanna Fundamental Investments, LLC | 27,840 | $586.6K | 0.02% | −1,182−4.1% | Reduced |
| Allspring Global Investments Holdings, LLC | 29,474 | $626.3K | 0.00% | +29,474 | New |
| Rafferty Asset Management, LLC | 29,998 | $632.1K | 0.00% | +5,802+24.0% | Added |