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NB Bancorp, Inc. Common Stock (NBBK) institutional ownership

Latest close $22.29 Jul 23, 2026
Market cap$596M 52-week range SectorFinancial Services
Funds holding · Q1 2026
150
reported NBBK position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
89 buyers · 61 sellers

NB Bancorp, Inc. Common Stock (NBBK) price and institutional activity

Dates

Q1 2026

$0 bought by 89 investors
Altravue Capital, LLCDimensional +87 more
$0 sold by 61 investors
Wellington Management Group LLPMarshall Wace, LLP +59 more
Bought Sold Totals per quarter; hover a bar for the names.

NB Bancorp, Inc. Common Stock (NBBK) institutional activity · 150

Investor Type Est. change Change Δ Own Date
Wellington Management Group LLP · Reduced
Change −761K Δ Own −51.7% Date Q1 2026
Wellington Management Group LLP Reduced· Q1 2026 −761K −51.7% Q1 2026
Altravue Capital, LLC · Added
Change +611K Date Q1 2026
Altravue Capital, LLC Added· Q1 2026 +611K Q1 2026
Marshall Wace, LLP · Exited
Change −252K Δ Own −100.0% Date Q1 2026
Marshall Wace, LLP Exited· Q1 2026 −252K −100.0% Q1 2026
Hotchkis & Wiley Capital Management LLC · Reduced
Change −251K Date Q1 2026
Hotchkis & Wiley Capital Management LLC Reduced· Q1 2026 −251K Q1 2026
Dimensional · Added
Change +234K Date Q1 2026
Dimensional Added· Q1 2026 +234K Q1 2026
State Street · Added
Change +179K Date Q1 2026
State Street Added· Q1 2026 +179K Q1 2026
Qube Research & Technologies Ltd · Added
Change +158K Date Q1 2026
Qube Research & Technologies Ltd Added· Q1 2026 +158K Q1 2026
Nuveen, LLC · Added
Change +141K Date Q1 2026
Nuveen, LLC Added· Q1 2026 +141K Q1 2026
Two Sigma Advisers, LP · Exited
Change −140K Δ Own −100.0% Date Q1 2026
Two Sigma Advisers, LP Exited· Q1 2026 −140K −100.0% Q1 2026
Pertento Partners LLP · Reduced
Change −137K Date Q1 2026
Pertento Partners LLP Reduced· Q1 2026 −137K Q1 2026
Ejf Capital LP · Reduced
Change −134K Date Q1 2026
Ejf Capital LP Reduced· Q1 2026 −134K Q1 2026
Geode · Added
Change +132K Date Q1 2026
Geode Added· Q1 2026 +132K Q1 2026
Alliancebernstein L.P. · Reduced
Change −124K Date Q1 2026
Alliancebernstein L.P. Reduced· Q1 2026 −124K Q1 2026
Two Sigma Investments, LP · Added
Change +119K Δ Own +47.0% Date Q1 2026
Two Sigma Investments, LP Added· Q1 2026 +119K +47.0% Q1 2026
New York State Common Retirement Fund · Added
Change +116K Date Q1 2026
New York State Common Retirement Fund Added· Q1 2026 +116K Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 150

Famous investor activity in NB Bancorp, Inc. Common Stock (NBBK)

NB Bancorp, Inc. Common Stock (NBBK) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Campanelli Joseph P. · Director 9 operations +$58K
Price $19.16–$19.21 Qty +3K Owned 378K Trade date May 15, 2026 Filed date May 18, 2026
Campanelli Joseph P. Director 9 operations $19.16–$19.21 +3K +$58K 378K May 15, 2026 May 18, 2026
Campanelli Joseph P. · Director 7 operations +$49K
Price $19.33–$19.62 Qty +2K Owned 375K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Campanelli Joseph P. Director 7 operations $19.33–$19.62 +2K +$49K 375K Apr 24, 2026 Apr 27, 2026
Campanelli Joseph P. · Director Tax withholding or exercise payment (F) -$483K
Price $19.82 Qty -24K Owned 372K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Campanelli Joseph P. Director Tax withholding or exercise payment (F) $19.82 -24K -$483K 372K Apr 24, 2026 Apr 27, 2026
Darcey William · Director Tax withholding or exercise payment (F) -$97K
Price $19.82 Qty -5K Owned 78K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Darcey William Director Tax withholding or exercise payment (F) $19.82 -5K -$97K 78K Apr 24, 2026 Apr 27, 2026
Jackson Angela · Director Tax withholding or exercise payment (F) -$97K
Price $19.82 Qty -5K Owned 76K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Jackson Angela Director Tax withholding or exercise payment (F) $19.82 -5K -$97K 76K Apr 24, 2026 Apr 27, 2026
Whalen Mark · Director Tax withholding or exercise payment (F) -$97K
Price $19.82 Qty -5K Owned 73K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Whalen Mark Director Tax withholding or exercise payment (F) $19.82 -5K -$97K 73K Apr 24, 2026 Apr 27, 2026
Nolan Joseph R. Jr · Director Tax withholding or exercise payment (F) -$97K
Price $19.82 Qty -5K Owned 83K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Nolan Joseph R. Jr Director Tax withholding or exercise payment (F) $19.82 -5K -$97K 83K Apr 24, 2026 Apr 27, 2026
Montgomery Kenneth C. · Director Tax withholding or exercise payment (F) -$99K
Price $19.82 Qty -5K Owned 80K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Montgomery Kenneth C. Director Tax withholding or exercise payment (F) $19.82 -5K -$99K 80K Apr 24, 2026 Apr 27, 2026
Lynch Christopher R. · Director Tax withholding or exercise payment (F) -$82K
Price $19.82 Qty -4K Owned 93K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Lynch Christopher R. Director Tax withholding or exercise payment (F) $19.82 -4K -$82K 93K Apr 24, 2026 Apr 27, 2026
Roberts Christine · Officer Tax withholding or exercise payment (F) -$71K
Price $19.82 Qty -4K Owned 71K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Roberts Christine Officer Tax withholding or exercise payment (F) $19.82 -4K -$71K 71K Apr 24, 2026 Apr 27, 2026
Pascucci Hope · Director 2 operations +$389K
Price $19.44–$19.49 Qty +20K Owned 142K Trade date Apr 24, 2026 Filed date Apr 24, 2026
Pascucci Hope Director 2 operations $19.44–$19.49 +20K +$389K 142K Apr 24, 2026 Apr 24, 2026
Campanelli Joseph P. · Director, Officer, Other Buy +$50K
Price $20.16 Qty +2K Owned 397K Trade date Mar 19, 2026 Filed date Mar 19, 2026
Campanelli Joseph P. Director, Officer, Other Buy $20.16 +2K +$50K 397K Mar 19, 2026 Mar 19, 2026
Schulman Matthew G. · Officer Grant (A) 7K
Owned 7K Trade date Mar 9, 2026 Filed date Mar 30, 2026
Schulman Matthew G. Officer Grant (A) 7K 7K Mar 9, 2026 Mar 30, 2026
Lapointe Jean-Pierre · Officer Buy +$20K
Price $20.42 Qty +1K Owned 110K Trade date Mar 9, 2026 Filed date Mar 9, 2026
Lapointe Jean-Pierre Officer Buy $20.42 +1K +$20K 110K Mar 9, 2026 Mar 9, 2026
Campanelli Joseph P. · Director, Officer, Other 2 operations +$104K
Price $20.77–$20.78 Qty +5K Owned 47K Trade date Mar 6, 2026 Filed date Mar 9, 2026
Campanelli Joseph P. Director, Officer, Other 2 operations $20.77–$20.78 +5K +$104K 47K Mar 6, 2026 Mar 9, 2026
15 of 46
15 of 46 Sign in to continue to older insider transactions.

NB Bancorp, Inc. Common Stock (NBBK) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Principal Financial Group Inc 4.1M
% of shares outstanding 8.6% Filing date Nov 14, 2024
Principal Financial Group Inc 4.1M 8.6% Nov 14, 2024
Blackrock, Inc. 3.3M
% of shares outstanding 7.7% Filing date Nov 8, 2024
Blackrock, Inc. 3.3M 7.7% Nov 8, 2024
Vanguard Group Inc 2.3M
% of shares outstanding 5.4% Filing date Nov 12, 2024
Vanguard Group Inc 2.3M 5.4% Nov 12, 2024
Pertento Partners LLP 2.0M
% of shares outstanding 4.6% Filing date May 15, 2026
Pertento Partners LLP 2.0M 4.6% May 15, 2026
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NB Bancorp, Inc. Common Stock (NBBK) ownership FAQ

Who owns NBBK?

150 reporting institutions disclosed NBBK position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.