Joseph B. Reilly - 02 Jan 2026 Form 4 Insider Report for NB Bancorp, Inc. (NBBK)

Reporting relationship: Director
Issuer ticker: NBBK
Reported as of: 02 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jan 2026, 12:30:09 UTC
Prior SEC filing: 25 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Steven Lanter, pursuant to power of attorney

Key filing fact

Joseph B. Reilly filed Form 4 for NB Bancorp, Inc. (NBBK) on 06 Jan 2026.

Key facts

This page summarizes Joseph B. Reilly's Form 4 filing for NB Bancorp, Inc. (NBBK).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 06 Jan 2026, 12:30.

Change

Previous filing in this sequence was filed on 25 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001749520 Primary reporting owner

Reilly Joseph B

Relationship: Director
Address: 1063 GREAT PLAIN AVE, NEEDHAM
Signature: /s/ Steven Lanter, pursuant to power of attorney
Signature date: 06 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NBBK transaction

Common Stock

Award

Transaction value: $0
Shares: +2,402
Change %: +20%
Price: $0.000000
Shares after: 14,414
Date: 02 Jan 2026
Ownership: Direct
Footnotes: F1

NBBK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 36,465
Date: 02 Jan 2026
Ownership: By Revocable Trust

NBBK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2,398
Date: 02 Jan 2026
Ownership: By ESOP

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Shares of restricted stock vest 100% on January 2, 2027.

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