NBBK Institutional Ownership & Shareholders
NB BANCORP INC (NBBK) is currently held by 162 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $462.94M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of NBBK tracked by InsiderSet, reporting ownership valued at approximately $70.40M in its June 30, 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 $74.59M, representing an estimated gain of +5.96% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 60% of the total disclosed NBBK value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Altravue Capital, 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
162
Total Reported Value
$462.94M
Largest Holder
Blackrock, Inc.
Largest Position
$70.40M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
74
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% | 3,331,544 | $70,395,517 | $74,593,270 | +$4,197,753 | +5.96% | |
| Vanguard Capital Management Llc | 0.00% | 1,670,835 | $35,304,744 | $37,409,996 | +$2,105,252 | +5.96% | |
| Altravue Capital, Llc | 2.52% | 1,655,108 | $34,972,432 | $37,057,868 | +$2,085,436 | +5.96% | |
| Pertento Partners Llp | 2.24% | 1,475,770 | $31,183,020 | $33,042,490 | +$1,859,470 | +5.96% | |
| State Street Corp | 0.00% | 1,471,766 | $31,098,416 | $32,952,841 | +$1,854,425 | +5.96% | |
| Geode Capital Management, Llc | 0.00% | 1,153,217 | $24,372,586 | $25,820,529 | +$1,447,943 | +5.94% | |
| Dimensional Fund Advisors Lp | 0.00% | 753,320 | $15,917,840 | $16,866,835 | +$948,995 | +5.96% | |
| Goldman Sachs Group Inc | 0.00% | 571,954 | $12,085,390 | $12,806,050 | +$720,660 | +5.96% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 501,172 | $10,589,764 | $11,221,241 | +$631,477 | +5.96% | |
| Nuveen, Llc | 0.00% | 498,869 | $10,541,102 | $11,169,677 | +$628,575 | +5.96% | |
| Fmr Llc | 0.00% | 497,305 | $10,508,060 | $11,134,659 | +$626,599 | +5.96% | |
| Vanguard Portfolio Management Llc | 0.00% | 397,046 | $8,389,582 | $8,889,860 | +$500,278 | +5.96% | |
| Legato Capital Management Llc | 0.64% | 366,090 | $7,735,482 | $8,196,755 | +$461,273 | +5.96% | |
| Northern Trust Corp | 0.00% | 360,492 | $7,617,196 | $8,071,416 | +$454,220 | +5.96% | |
| New York State Common Retirement Fund | 0.01% | 346,155 | $7,314,255 | $7,750,410 | +$436,155 | +5.96% | |
| Charles Schwab Investment Management Inc | 0.00% | 318,612 | $6,732,272 | $7,133,723 | +$401,451 | +5.96% | |
| Citadel Advisors Llc | 0.00% | 289,814 | $6,123,769 | $6,488,935 | +$365,166 | +5.96% | |
| Two Sigma Investments, Lp | 0.00% | 277,027 | $5,853,581 | $6,202,635 | +$349,054 | +5.96% | |
| American Century Companies Inc | 0.00% | 261,866 | $5,533,229 | $5,863,180 | +$329,951 | +5.96% | |
| Vanguard Fiduciary Trust Co | 0.00% | 253,951 | $5,365,985 | $5,685,963 | +$319,978 | +5.96% | |
| Morgan Stanley | 0.00% | 229,194 | $4,842,871 | $5,131,654 | +$288,783 | +5.96% | |
| Bridgeway Capital Management, Llc | 0.08% | 221,399 | $4,678,161 | $4,957,124 | +$278,963 | +5.96% | |
| Empowered Funds, Llc | 0.02% | 181,399 | $3,832,961 | $4,061,524 | +$228,563 | +5.96% | |
| Hennessy Advisors Inc | 0.12% | 178,000 | $3,761,140 | $3,985,420 | +$224,280 | +5.96% | |
| Bank Of New York Mellon Corp | 0.00% | 171,541 | $3,624,661 | $3,840,803 | +$216,142 | +5.96% | |
| D. E. Shaw & Co., Inc. | 0.00% | 149,931 | $3,168,042 | $3,356,955 | +$188,913 | +5.96% | |
| Sei Investments Co | 0.00% | 142,346 | $3,007,770 | $3,187,127 | +$179,357 | +5.96% | |
| First Trust Advisors Lp | 0.00% | 142,253 | $3,005,805 | $3,185,045 | +$179,240 | +5.96% | |
| Ubs Group Ag | 0.00% | 140,405 | $2,966,758 | $3,143,668 | +$176,910 | +5.96% | |
| International Assets Investment Management, Llc | 0.17% | 131,013 | $2,832,501 | $2,933,381 | +$100,880 | +3.56% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 131,440 | $2,777,327 | $2,942,942 | +$165,615 | +5.96% |
| Alliancebernstein L.P. | 0.00% | 130,219 | $2,743,714 | $2,915,603 | +$171,889 | +6.26% | |
| Panagora Asset Management Inc | 0.01% | 129,355 | $2,733,271 | $2,896,258 | +$162,987 | +5.96% | |
| Qube Research & Technologies Ltd | 0.00% | 127,236 | $2,688,497 | $2,848,814 | +$160,317 | +5.96% | |
| Financial Engines Advisors L.L.C. | 0.00% | 126,788 | $2,679,030 | $2,838,783 | +$159,753 | +5.96% | |
| Marshall Wace, Llp | 0.00% | 123,112 | $2,601,358 | $2,756,478 | +$155,120 | +5.96% | |
| Aqr Capital Management Llc | 0.00% | 116,349 | $2,458,459 | $2,605,054 | +$146,595 | +5.96% | |
| Mangrove Partners Im, Llc | 0.15% | 111,356 | $2,352,952 | $2,493,261 | +$140,309 | +5.96% | |
| Invesco Ltd. | 0.00% | 97,941 | $2,069,493 | $2,192,899 | +$123,406 | +5.96% | |
| Oppenheimer & Close, Llc | 1.11% | 82,999 | $1,753,769 | $1,858,348 | +$104,579 | +5.96% | |
| Millennium Management Llc | 0.00% | 81,447 | $1,720,975 | $1,823,598 | +$102,623 | +5.96% | |
| Swiss National Bank | 0.00% | 77,100 | $1,629,123 | $1,726,269 | +$97,146 | +5.96% | |
| Credit Agricole S A | 0.00% | 70,000 | $1,479,100 | $1,567,300 | +$88,200 | +5.96% | |
| Mackenzie Financial Corp | 0.00% | 67,441 | $1,425,028 | $1,510,004 | +$84,976 | +5.96% | |
| Round Rock Advisors Llc | 0.18% | 66,530 | $1,405,779 | $1,489,607 | +$83,828 | +5.96% | |
| Focus Partners Wealth | 0.00% | 65,728 | $1,388,831 | $1,471,650 | +$82,819 | +5.96% | |
| Y-Intercept (Hong Kong) Ltd | 0.03% | 61,260 | $1,355,071 | $1,371,611 | +$16,540 | +1.22% | |
| Bnp Paribas Financial Markets | 0.00% | 62,478 | $1,320,160 | $1,398,882 | +$78,722 | +5.96% | |
| Principal Financial Group Inc | 0.00% | 59,231 | $1,251,551 | $1,326,182 | +$74,631 | +5.96% | |
| Op Asset Management Ltd | 0.01% | 58,392 | $1,230,319 | $1,307,397 | +$77,078 | +6.26% |
Frequently asked questions about NBBK
Who are the largest institutional holders of NBBK?
The largest institutional holders of NBBK reported in the latest SEC Form 13F filings include Blackrock, Inc., Vanguard Capital Management Llc, Altravue Capital, Llc, Pertento Partners Llp, and State Street Corp. InsiderSet ranks institutional holders by their latest reported NBBK position.
What is NBBK institutional ownership?
This page tracks NBBK positions reported by institutional investment managers through SEC Form 13F. NB BANCORP INC (NBBK) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own NBBK?
InsiderSet currently tracks 162 institutional managers reporting NBBK holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of NBBK shareholders.
How much NBBK stock do institutions own?
Institutional investment managers disclosed approximately $462.94M in NBBK holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was NBBK institutional ownership last updated?
The latest NBBK institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional NBBK holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its NBBK position after the reporting date.
Are institutions buying or selling NBBK?
Institutional buying and selling can be analyzed by comparing NBBK positions across consecutive 13F reporting periods. InsiderSet's NBBK Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View NBBK ownership changes.
How has NBBK institutional ownership changed over time?
InsiderSet tracks NBBK institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.