NBBK NB Bancorp, Inc.
NB Bancorp, Inc. (NBBK) Institutional Ownership
What the institutions did with NBBK last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 3.3M | 14.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | 7.4% |
| AltraVue Capital, LLC | 1.7M | 7.4% |
| Pertento Partners LLP | 1.5M | 6.6% |
| STATE STREET CORP | 1.5M | 6.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2M | 5.1% |
| DIMENSIONAL FUND ADVISORS LP | 753.3K | 3.3% |
| GOLDMAN SACHS GROUP INC | 572.0K | 2.5% |
| Tieton Capital Management, LLC | 546.6K | 2.4% |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 501.2K | 2.2% |
| Nuveen, LLC | 498.9K | 2.2% |
| FMR LLC | 497.3K | 2.2% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 397.0K | 1.8% |
| Legato Capital Management LLC | 366.1K | 1.6% |
| NORTHERN TRUST CORP | 360.5K | 1.6% |
| NEW YORK STATE COMMON RETIREMENT FUND | 346.2K | 1.5% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 318.6K | 1.4% |
| CITADEL ADVISORS LLC | 289.8K | 1.3% |
| TWO SIGMA INVESTMENTS, LP | 277.0K | 1.2% |
| AMERICAN CENTURY COMPANIES INC | 261.9K | 1.2% |
| VANGUARD FIDUCIARY TRUST CO | 254.0K | 1.1% |
| MORGAN STANLEY | 229.2K | 1.0% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 221.4K | 1.0% |
| Empowered Funds, LLC | 181.4K | 0.8% |
| HENNESSY ADVISORS INC | 178.0K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Pertento Partners LLP | Reduced | 2.2M | 1.5M | -730.9K |
| WELLINGTON MANAGEMENT GROUP LLP | Sold Out | 710.0K | 0 | -710.0K |
| AltraVue Capital, LLC | Increased | 1.3M | 1.7M | +351.0K |
| BlackRock, Inc. | Increased | 3.1M | 3.3M | +247.3K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 522.4K | 753.3K | +230.9K |
| STATE STREET CORP | Increased | 1.3M | 1.5M | +178.2K |
| CITADEL ADVISORS LLC | Increased | 116.4K | 289.8K | +173.4K |
| SEI INVESTMENTS CO | Reduced | 302.2K | 142.3K | -159.8K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 263.9K | 131.4K | -132.5K |
| MARSHALL WACE, LLP | New | 0 | 123.1K | +123.1K |
| GOLDMAN SACHS GROUP INC | Reduced | 691.7K | 572.0K | -119.7K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 371.8K | 277.0K | -94.8K |
| Legato Capital Management LLC | Increased | 276.1K | 366.1K | +90.0K |
| NEW YORK STATE COMMON RETIREMENT FUND | Increased | 260.6K | 346.2K | +85.6K |
| D. E. Shaw & Co., Inc. | Increased | 70.4K | 149.9K | +79.5K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 158.2K | 81.4K | -76.8K |
| BANK OF AMERICA CORP /DE/ | Reduced | 118.8K | 48.9K | -69.9K |
| UBS Group AG | Increased | 76.1K | 140.4K | +64.3K |
| JANE STREET GROUP, LLC | Sold Out | 60.7K | 0 | -60.7K |
| FMR LLC | Increased | 437.7K | 497.3K | +59.6K |
| OP Asset Management Ltd | Sold Out | 58.4K | 0 | -58.4K |
| LAZARD ASSET MANAGEMENT LLC | Sold Out | 57.3K | 0 | -57.3K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 54.5K | +54.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.1M | 1.2M | +54.3K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Sold Out | 51.6K | 0 | -51.6K |
| MORGAN STANLEY | Reduced | 279.9K | 229.2K | -50.7K |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | Increased | 450.8K | 501.2K | +50.4K |
| RAFFLES ASSOCIATES LP | Increased | 14.9K | 63.7K | +48.9K |
| Qube Research & Technologies Ltd | Reduced | 175.1K | 127.2K | -47.8K |
| Trexquant Investment LP | New | 0 | 46.3K | +46.3K |
| Integrated Quantitative Investments LLC | Sold Out | 37.1K | 0 | -37.1K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 1.7M | 1.7M | -33.1K |
| Connor, Clark & Lunn Investment Management Ltd. | Sold Out | 32.2K | 0 | -32.2K |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | Sold Out | 27.8K | 0 | -27.8K |
| Focus Partners Wealth | Reduced | 92.8K | 65.7K | -27.1K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Sold Out | 25.4K | 0 | -25.4K |
| NORTHERN TRUST CORP | Increased | 335.4K | 360.5K | +25.1K |
| Four Tree Island Advisory LLC | Sold Out | 25.0K | 0 | -25.0K |
| MARTINGALE ASSET MANAGEMENT L P | Sold Out | 23.9K | 0 | -23.9K |
| Bank of New York Mellon Corp | Increased | 148.1K | 171.5K | +23.5K |
| PANAGORA ASSET MANAGEMENT INC | Reduced | 150.1K | 129.4K | -20.7K |
| Bleakley Financial Group, LLC | Increased | 13.6K | 34.3K | +20.7K |
| MIRABELLA FINANCIAL SERVICES LLP | New | 0 | 20.2K | +20.2K |
| RAYMOND JAMES FINANCIAL INC | Increased | 9.9K | 29.9K | +20.0K |
| WELLS FARGO & COMPANY/MN | Increased | 16.2K | 35.2K | +19.0K |
| Quantinno Capital Management LP | Increased | 25.9K | 44.1K | +18.2K |
| Polymer Capital Management (US) LLC | Sold Out | 17.9K | 0 | -17.9K |
| Russell Investments Group, Ltd. | Increased | 4.3K | 21.3K | +17.0K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | Sold Out | 16.8K | 0 | -16.8K |
| JPMORGAN CHASE & CO | Reduced | 36.1K | 19.3K | -16.8K |
| MACKENZIE FINANCIAL CORP | Increased | 50.9K | 67.4K | +16.5K |
| Susquehanna Portfolio Strategies, LLC | Reduced | 25.4K | 9.8K | -15.6K |
| STILWELL VALUE LLC | Reduced | 65.0K | 50.0K | -15.0K |
| STATE OF WISCONSIN INVESTMENT BOARD | Increased | 24.4K | 38.2K | +13.8K |
| Diversified Trust Co | Sold Out | 13.2K | 0 | -13.2K |
| CITIGROUP INC | Increased | 33.5K | 46.6K | +13.1K |
| IMC-Chicago, LLC | New | 0 | 13.0K | +13.0K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Increased | 208.4K | 221.4K | +13.0K |
| Empowered Funds, LLC | Increased | 168.4K | 181.4K | +13.0K |
| Sterling Capital Management LLC | Reduced | 13.3K | 820 | -12.5K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.