NB Bancorp, Inc.
Ownership
Ownership Structure
Who owns NB Bancorp, Inc. (NBBK)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 87.7% of the shares are freely tradable; institutional investors hold 52.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.04 | 3,084,222 | -0.6 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.89 | 1,703,928 | +0.0 | 03/31/2026 |
| AltraVue Capital, LLC | 3.78 | 1,655,108 | +26.9 | 06/30/2026 |
| Pertento Partners LLP | 3.37 | 1,475,770 | -33.1 | 06/30/2026 |
| State Street Corp | 2.95 | 1,293,538 | +16.1 | 03/31/2026 |
| Geode Capital Management, LLC | 2.51 | 1,098,930 | +13.7 | 03/31/2026 |
| Dimensional Fund Advisors, Inc. | 1.72 | 753,320 | +44.2 | 06/30/2026 |
| The Goldman Sachs Group Inc | 1.58 | 691,668 | +16.5 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.72 | 1,191,725 | +0.0 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.34 | 1,024,065 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Campanelli Joseph P | President & CEO | 379,790 | 8,659,212 $ | Aug 20, 2026 | direct |
| Lapointe Jean-Pierre | SEVP and CFO | 110,531 | 2,520,107 $ | Aug 20, 2026 | direct |
| Henkin Kevin | EVP, Chief Credit Officer | 6,874 | 156,727 $ | Aug 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 20, 2026 | Campanelli Joseph P | President & CEO | Buy | 2,000 | 21.75 | 43,500 |
| Aug 20, 2026 | Lapointe Jean-Pierre | SEVP and CFO | Buy | 200 | 21.80 | 4,360 |
| Aug 14, 2026 | Henkin Kevin | EVP, Chief Credit Officer | Sell | 2,000 | 22.93 | 45,860 |
| Apr 24, 2026 | Hope Pascucci | Director | Buy | 20,000 | 19.46 | 389,200 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.