NB Bancorp, Inc. Common Stock (NBBK) Insider Trading
Over the last 3 months, NBBK insiders made 2 open-market buys and 1 sale, a net purchase of $2K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 132 institutions increased and 98 reduced their position (13F).
Insider Activity
Sentiment
57/100
Buys (3m)
2
Sells (3m)
1
Net (3m)
$2.0K
Insiders buyingCluster buying
Insider trades by month Buys Sells
Dec
Jan
Mar
Apr
May
Aug
Context3-month price +12.8%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 21, 2026 | Lapointe Jean-Pierreofficer: SEVP and CFO | Buy | 200 | $21.80 |
| Aug 21, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 2,000 | $21.75 |
| Aug 18, 2026 | Henkin Kevinofficer: EVP, Chief Credit Officer | Sell | 2,000 | $22.93 |
| May 18, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 400 | $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 | 767 | $19.18 |
| 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 | 247 | $19.21 |
| 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 |
| Apr 27, 2026 | Darcey Williamdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Roberts Christineofficer: SEVP and COO | Tax | 3,589 | $19.82 |
| Apr 27, 2026 | Lynch Christopher R.director | Tax | 4,150 | $19.82 |
| Apr 27, 2026 | Montgomery Kenneth C.director | Tax | 5,015 | $19.82 |
| Apr 27, 2026 | NOLAN JOSEPH R JRdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Whalen Markdirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | Jackson Angeladirector | Tax | 4,918 | $19.82 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 100 | $19.47 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Buy | 178 | $19.46 |
| 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 | 500 | $19.37 |
| 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 | 320 | $19.33 |
| Apr 27, 2026 | CAMPANELLI JOSEPH Pdirector, officer, other: President & CEO | Tax | 24,371 | $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 |
Source: NBBK SEC Form 4 filings, latest Aug 21, 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
132
New positions
45
Reduced
98
Sold out
25
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 3.3M | Aug 7, 2026 |
| BLACKROCK, INC. | Reduced | 3.1M | May 13, 2026 |
| PERTENTO PARTNERS LLP | Reduced | 2.2M | May 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.7M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 1.7M | Aug 13, 2026 |
| AltraVue Capital, LLC | Increased | 1.7M | Aug 13, 2026 |
| Pertento Partners LLP | Reduced | 1.5M | Aug 13, 2026 |
| STATE STREET CORP | Increased | 1.5M | Aug 7, 2026 |
| ALTRAVUE CAPITAL, LLC | Increased | 1.3M | May 13, 2026 |
| STATE STREET CORP | Increased | 1.3M | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.2M | Aug 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.1M | May 15, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Increased | 753K | Aug 11, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 710K | May 15, 2026 |
| GOLDMAN SACHS GROUP INC | Reduced | 692K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.