NB Bancorp, Inc. Common Stock (NBBK) Insider Trading
Over the last 3 months, NBBK insiders made 18 open-market buys and 0 sales, a net purchase of $454K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 149 institutions increased and 81 reduced their position (13F).
Insider Activity
Sentiment
100/100
Buys (3m)
18
Sells (3m)
0
Net (3m)
$453.9K
Insiders buyingCluster buying
Insider trades by month Buys Sells
Oct
Dec
Jan
Mar
Apr
May
Context3-month price -10.3%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 133 | $19.17 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 500 | $19.16 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 247 | $19.21 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 253 | $19.20 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 767 | $19.18 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 100 | $19.18 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 400 | $19.18 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 100 | $19.47 |
| Apr 27, 2026 | Darcey Williamdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Jackson Angeladirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Whalen Markdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | NOLAN JOSEPH R JRdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Lynch Christopher R.director | Tax | 4,150 | $19.82 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Tax | 24,371 | $19.82 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 320 | $19.33 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 180 | $19.34 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 500 | $19.37 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 722 | $19.45 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 178 | $19.46 |
| Apr 27, 2026 | Roberts Christineofficer: SEVP and COO | Tax | 3,589 | $19.82 |
| Apr 27, 2026 | Montgomery Kenneth C.director | Tax | 5,015 | $19.82 |
| Apr 24, 2026 | Pascucci Hopedirector | Buy | 10,000 | $19.44 |
| Mar 30, 2026 | Schulman Matthew Gofficer: EVP, President Needham Prv Bnk | Grant | 6,980 | — |
| Mar 19, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 2,500 | $20.16 |
| Mar 9, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 2,000 | $20.78 |
| Mar 9, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 3,000 | $20.77 |
| Mar 9, 2026 | Lapointe Jean-Pierreofficer: SEVP and CFO | Buy | 1,000 | $20.42 |
| Feb 27, 2026 | EVANGELISTA PAUL Aofficer: EVP, Dir Spec. Bank. Ctr. | Grant | 6,874 | — |
| Feb 27, 2026 | Henkin Kevinofficer: EVP, Chief Credit Officer | Grant | 6,874 | — |
| Feb 27, 2026 | Richardson Matthewofficer: EVP, Treasury & Cash Mgmt Svcs | Grant | 13,749 | — |
Source: NBBK SEC Form 4 filings, latest May 18, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their NBBK positions over the last 6 months (SEC Form 13F).
Increased
149
New positions
62
Reduced
81
Sold out
27
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 3.1M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 3.1M | May 13, 2026 |
| PERTENTO PARTNERS LLP | Increased | 2.3M | Feb 17, 2026 |
| VANGUARD GROUP INC | Increased | 2.3M | Jan 29, 2026 |
| PERTENTO PARTNERS LLP | Reduced | 2.2M | May 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.7M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 1.5M | Feb 17, 2026 |
| ALTRAVUE CAPITAL, LLC | Increased | 1.3M | May 13, 2026 |
| STATE STREET CORP | Increased | 1.3M | May 15, 2026 |
| STATE STREET CORP | Reduced | 1.1M | Feb 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.1M | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 967K | Feb 9, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 710K | May 15, 2026 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | Increased | 702K | Feb 17, 2026 |
| ALTRAVUE CAPITAL, LLC | New Position | 693K | Feb 11, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.