NB Bancorp, Inc. (NBBK) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-05-18

NB Bancorp, Inc. (NBBK) has filed 16 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-05-18. 4 Form 8-K material event filings were reported by NBBK in the last 90 days. InsiderAlpha tracks every NBBK SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About NB Bancorp, Inc. (NBBK)

SEC CIK0001979330

90-Day SEC Filing Activity

Form 4 filings (90d)16
Form 8-K filings (90d)4
Latest Form 4 filing2026-05-18

Recent NBBK Insider Transactions (Form 4)

DateInsiderRoleTransactionSharesPriceValueFiling
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase253$19.20$5KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase767$19.18$15KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase400$19.18$8KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase500$19.19$10KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase247$19.21$5KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase100$19.20$2KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase500$19.16$10KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase133$19.17$3KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase100$19.18$2KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase500$19.37$10KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase722$19.45$14KSEC
CAMPANELLI JOSEPH PPresident & CEOF — Tax withholding / forfeiture24.4K$19.82$483KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase320$19.33$6KSEC
CAMPANELLI JOSEPH PPresident & CEOP — Open-market purchase180$19.34$3KSEC
Whalen MarkDirectorF — Tax withholding / forfeiture4.9K$19.82$97KSEC

All transactions sourced from SEC EDGAR Form 4 filings for NB Bancorp, Inc. (NBBK). Updated in real time as new filings are submitted to the SEC.

Most-Active NBBK Insiders — Last 90 Days

InsiderForm 4 filingsTotal transaction value
CAMPANELLI JOSEPH P17$589K
Darcey William2$97K
Montgomery Kenneth C.2$99K
Pascucci Hope2$389K
NOLAN JOSEPH R JR2$97K

Recent NBBK Form 8-K Material Events

Recent Insider Filings

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in NBBK insider filings:

POpen-market purchase by the insider
SOpen-market sale by the insider
AGrant, award, or other acquisition from the issuer
MExercise or conversion of derivative security (e.g. options)
FPayment of exercise price or tax liability via share withholding
GBona-fide gift of securities
DDisposition to the issuer (e.g. share buyback participation)
JOther acquisition or disposition
XExercise of in-the-money or at-the-money derivative security
CConversion of derivative security
VTransaction voluntarily reported earlier than required

NBBK Insider Trading — FAQ

What is the latest insider trade for NBBK?
NB Bancorp, Inc. (NBBK) had 16 insider filings in the last 90 days, with the most recent on 2026-05-18. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying NBBK stock?
0 insider purchases of NBBK were filed in the last 90 days.
How many insiders are selling NBBK stock?
0 insider sales of NBBK were filed in the last 90 days.
Where can I see NBBK SEC filings (Form 4, 10-K, 10-Q, 8-K)?
InsiderAlpha aggregates every NBBK SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

Learn More

Open the live NBBK dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.