NB BANCORP INC (NBBK) Institutional Shareholders
NB BANCORP INC (NBBK) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $468.78M in NBBK holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of NBBK tracked by InsiderSet, reporting ownership valued at approximately $64.98M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $71.92M, representing an estimated gain of +10.68% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 59% of the total disclosed NBBK value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Pertento Partners Llp, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in NB BANCORP INC (NBBK).
This page ranks the largest institutional NBBK shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
171
Total Reported Value
$468.78M
Largest Holder
Blackrock, Inc.
Largest Position
$64.98M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
166
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 3,084,222 | $64,984,549 | $71,924,057 | +$6,939,508 | +10.68% | |
| Pertento Partners Llp | 4.93% | 2,206,666 | $46,494,453 | $51,459,451 | +$4,964,998 | +10.68% | |
| Vanguard Capital Management Llc | 0.00% | 1,703,928 | $35,901,763 | $39,735,601 | +$3,833,838 | +10.68% | |
| Altravue Capital, Llc | 2.37% | 1,304,080 | $27,476,966 | $30,411,146 | +$2,934,180 | +10.68% | |
| State Street Corp | 0.00% | 1,293,538 | $27,254,846 | $30,165,306 | +$2,910,460 | +10.68% | |
| Geode Capital Management, Llc | 0.00% | 1,098,930 | $23,159,188 | $25,627,048 | +$2,467,860 | +10.66% | |
| Wellington Management Group Llp | 0.00% | 710,000 | $14,959,700 | $16,557,200 | +$1,597,500 | +10.68% | |
| Goldman Sachs Group Inc | 0.00% | 691,668 | $14,573,447 | $16,129,698 | +$1,556,251 | +10.68% | |
| Dimensional Fund Advisors Lp | 0.00% | 522,384 | $11,005,796 | $12,181,995 | +$1,176,199 | +10.69% | |
| Nuveen, Llc | 0.00% | 488,033 | $10,282,856 | $11,380,930 | +$1,098,074 | +10.68% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 450,772 | $9,497,766 | $10,512,003 | +$1,014,237 | +10.68% | |
| Fmr Llc | 0.00% | 437,725 | $9,222,866 | $10,207,747 | +$984,881 | +10.68% | |
| Vanguard Portfolio Management Llc | 0.00% | 386,132 | $8,135,801 | $9,004,598 | +$868,797 | +10.68% | |
| Two Sigma Investments, Lp | 0.01% | 371,807 | $7,833,973 | $8,670,539 | +$836,566 | +10.68% | |
| New York State Common Retirement Fund | 0.01% | 346,155 | $7,314,255 | $8,072,335 | +$758,080 | +10.36% | |
| Northern Trust Corp | 0.00% | 335,360 | $7,066,034 | $7,820,595 | +$754,561 | +10.68% | |
| Charles Schwab Investment Management Inc | 0.00% | 318,365 | $6,707,951 | $7,424,272 | +$716,321 | +10.68% | |
| Sei Investments Co | 0.01% | 302,181 | $6,366,955 | $7,046,861 | +$679,906 | +10.68% | |
| Morgan Stanley | 0.00% | 279,870 | $5,896,862 | $6,526,568 | +$629,706 | +10.68% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 263,906 | $5,560,499 | $6,154,288 | +$593,789 | +10.68% |
| American Century Companies Inc | 0.00% | 263,656 | $5,555,232 | $6,148,458 | +$593,226 | +10.68% | |
| Vanguard Fiduciary Trust Co | 0.00% | 254,038 | $5,352,581 | $5,924,166 | +$571,585 | +10.68% | |
| Bridgeway Capital Management, Llc | 0.09% | 208,394 | $4,390,862 | $4,859,748 | +$468,886 | +10.68% | |
| Hennessy Advisors Inc | 0.12% | 178,000 | $3,761,140 | $4,150,960 | +$389,820 | +10.36% | |
| Qube Research & Technologies Ltd | 0.01% | 175,066 | $3,688,641 | $4,082,539 | +$393,898 | +10.68% | |
| Empowered Funds, Llc | 0.02% | 168,394 | $3,548,062 | $3,926,948 | +$378,886 | +10.68% | |
| Millennium Management Llc | 0.00% | 158,243 | $3,334,180 | $3,690,227 | +$356,047 | +10.68% | |
| Panagora Asset Management Inc | 0.01% | 150,096 | $3,162,523 | $3,500,239 | +$337,716 | +10.68% | |
| Bank Of New York Mellon Corp | 0.00% | 148,066 | $3,119,750 | $3,452,899 | +$333,149 | +10.68% | |
| First Trust Advisors Lp | 0.00% | 140,264 | $2,955,362 | $3,270,956 | +$315,594 | +10.68% | |
| International Assets Investment Management, Llc | 0.17% | 131,013 | $2,832,501 | $3,055,223 | +$222,722 | +7.86% | |
| Aqr Capital Management Llc | 0.00% | 128,821 | $2,714,262 | $3,004,106 | +$289,844 | +10.68% | |
| Financial Engines Advisors L.L.C. | 0.01% | 125,723 | $2,648,984 | $2,931,860 | +$282,876 | +10.68% | |
| Alliancebernstein L.P. | 0.00% | 130,219 | $2,580,941 | $3,036,707 | +$455,766 | +17.66% | |
| Bank Of America Corp | 0.00% | 118,801 | $2,503,136 | $2,770,439 | +$267,303 | +10.68% | |
| Citadel Advisors Llc | 0.00% | 116,371 | $2,451,937 | $2,713,772 | +$261,835 | +10.68% | |
| Mangrove Partners Im, Llc | 0.19% | 111,356 | $2,346,271 | $2,596,822 | +$250,551 | +10.68% | |
| Invesco Ltd. | 0.00% | 101,244 | $2,133,211 | $2,361,010 | +$227,799 | +10.68% | |
| Focus Partners Wealth | 0.00% | 92,809 | $1,955,475 | $2,164,306 | +$208,831 | +10.68% | |
| Oppenheimer & Close, Llc | 1.10% | 82,999 | $1,748,789 | $1,935,537 | +$186,748 | +10.68% | |
| Swiss National Bank | 0.00% | 77,100 | $1,624,497 | $1,797,972 | +$173,475 | +10.68% | |
| Ubs Group Ag | 0.00% | 76,120 | $1,603,848 | $1,775,118 | +$171,270 | +10.68% | |
| Creative Planning | 0.00% | 70,906 | $1,493,981 | $1,653,528 | +$159,547 | +10.68% | |
| D. E. Shaw & Co., Inc. | 0.00% | 70,385 | $1,483,012 | $1,641,378 | +$158,366 | +10.68% | |
| Credit Agricole S A | 0.00% | 70,000 | $1,474,900 | $1,632,400 | +$157,500 | +10.68% | |
| Round Rock Advisors Llc | 0.21% | 66,467 | $1,400,460 | $1,550,010 | +$149,550 | +10.68% | |
| Stilwell Value Llc | 0.82% | 65,000 | $1,369,550 | $1,515,800 | +$146,250 | +10.68% | |
| Jane Street Group, Llc | 0.00% | 60,669 | $1,278,296 | $1,414,801 | +$136,505 | +10.68% | |
| Principal Financial Group Inc | 0.00% | 59,231 | $1,251,551 | $1,381,267 | +$129,716 | +10.36% | |
| Lazard Asset Management Llc | 0.00% | 57,302 | $1,207,353 | $1,336,283 | +$128,930 | +10.68% |
Frequently asked questions about NBBK
Who owns the most NBBK stock?
The largest holders of NBBK are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for NB BANCORP INC (NBBK).
Is NBBK widely held by superinvestors?
Many widely followed stocks like NBBK appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly NBBK is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.