NB Bancorp, Inc. SEC EDGAR Filings (CIK 0001979330)

SEC EDGAR filings, ownership reports, and insider transactions for NB Bancorp, Inc..

Symbol
NBBK on Nasdaq
Industry
Savings Institutions, Not Federally Chartered (Office Of Finance)
Business address
1063 Great Plain Avenue, Needham, MA, 02492
Fiscal year end
31 December
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NB Bancorp, Inc. has filed 196 SEC EDGAR filings since 09 Jun 2023

Latest Filings

Recent SEC filings for NB Bancorp, Inc. including 8-K, 4, SCHEDULE 13G/A and more.

Form type Document Filing Description Filing date Reporting date File number(s)
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 22 Jan 2026 22 Jan 2026 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 19 Dec 2025 19 Dec 2025
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 05 Dec 2025 005-94523
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 25 Nov 2025 15 Nov 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 17 Nov 2025 15 Nov 2025 001-41899
S-8 Open S-8 document | Open XBRL data View SEC filing for S-8 FORM S-8 14 Nov 2025 333-291554
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 14 Nov 2025 14 Nov 2025 001-41899
425 Open 425 document View SEC filing for 425 425 13 Nov 2025 001-41899
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A FORM 8-K 13 Nov 2025 13 Nov 2025 001-41899
425 Open 425 document View SEC filing for 425 425 13 Nov 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 13 Nov 2025 13 Nov 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 12 Nov 2025 10 Nov 2025
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 07 Nov 2025 30 Sep 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 04 Nov 2025 04 Nov 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 03 Nov 2025 30 Oct 2025
425 Open 425 document View SEC filing for 425 425 31 Oct 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 31 Oct 2025 31 Oct 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 29 Oct 2025 28 Oct 2025
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A 8-K/A 23 Oct 2025 22 Oct 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 22 Oct 2025 22 Oct 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 20 Oct 2025 20 Oct 2025 001-41899
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 17 Oct 2025 005-94523
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 08 Oct 2025 07 Oct 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 18 Sep 2025 16 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 15 Sep 2025 12 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 12 Sep 2025 10 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 11 Sep 2025 09 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 12 Aug 2025 11 Aug 2025
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Aug 2025 30 Jun 2025 001-41899
EFFECT Open EFFECT document View SEC filing for EFFECT 30 Jul 2025 333-288494
424B3 Open 424B3 document View SEC filing for 424B3 424B3 30 Jul 2025 333-288494
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 29 Jul 2025 005-94523
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 29 Jul 2025 29 Jul 2025 001-41899
CORRESP Open CORRESP document View SEC filing for CORRESP 28 Jul 2025
S-4/A Open S-4/A document View SEC filing for S-4/A S-4/A 28 Jul 2025 333-288494
4 Open 4 document View SEC filing for 4 FORM 4 25 Jul 2025 25 Jul 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 23 Jul 2025 23 Jul 2025 001-41899
3 Open 3 document View SEC filing for 3 FORM 3 23 Jul 2025 07 Jul 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 16 Jul 2025 15 Jul 2025 001-41899
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 10 Jul 2025 333-288494
S-4 Open S-4 document View SEC filing for S-4 S-4 02 Jul 2025 333-288494
11-K Open 11-K document View SEC filing for 11-K 11-K 25 Jun 2025 31 Dec 2024 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 18 Jun 2025 10 Jun 2025
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 11 Jun 2025 005-94523
4 Open 4 document View SEC filing for 4 FORM 4 10 Jun 2025 09 Jun 2025
4 Open 4 document View SEC filing for 4 FORM 4 10 Jun 2025 09 Jun 2025
425 Open 425 document | Open XBRL data View SEC filing for 425 425 06 Jun 2025 001-41899
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A 8-K/A 05 Jun 2025 05 Jun 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Jun 2025 05 Jun 2025 001-41899
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 May 2025 31 Mar 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 07 May 2025 07 May 2025 001-41899
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 30 Apr 2025 005-94523
4 Open 4 document View SEC filing for 4 FORM 4 29 Apr 2025 29 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2025 24 Apr 2025
S-8 Open S-8 document View SEC filing for S-8 S-8 24 Apr 2025 333-286724
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 24 Apr 2025 23 Apr 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 22 Apr 2025 22 Apr 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 31 Mar 2025 28 Mar 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 18 Mar 2025 18 Mar 2025
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 14 Mar 2025 23 Apr 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 13 Mar 2025 11 Mar 2025
ARS Open ARS document View SEC filing for ARS ARS 11 Mar 2025 31 Dec 2024 001-41899
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 07 Mar 2025 31 Dec 2024 001-41899
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 12 Feb 2025 005-94523
3 Open 3 document View SEC filing for 3 FORM 3 03 Feb 2025 22 Jan 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 31 Jan 2025 28 Jan 2025 001-41899
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 30 Jan 2025 005-94523
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 29 Jan 2025 29 Jan 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 27 Jan 2025 24 Jan 2025
4 Open 4 document View SEC filing for 4 FORM 4 24 Jan 2025 24 Jan 2025
3 Open 3 document View SEC filing for 3 FORM 3 22 Jan 2025 06 Jan 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 22 Jan 2025 22 Jan 2025 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 06 Jan 2025 03 Jan 2025 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 19 Nov 2024 19 Nov 2024
SC 13G Open SC 13G document View SEC filing for SC 13G 13G NB BANCORP INC. 093024 14 Nov 2024 005-94523
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 14 Nov 2024 14 Nov 2024 001-41899
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 12 Nov 2024 005-94523
SC 13G Open SC 13G document View SEC filing for SC 13G 08 Nov 2024 005-94523
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Nov 2024 30 Sep 2024 001-41899
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 04 Nov 2024 005-94523
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 30 Oct 2024 30 Oct 2024 001-41899
SC 13G Open SC 13G document View SEC filing for SC 13G 22 Oct 2024 005-94523
4 Open 4 document View SEC filing for 4 FORM 4 20 Sep 2024 19 Sep 2024
4 Open 4 document View SEC filing for 4 FORM 4 20 Sep 2024 19 Sep 2024
3 Open 3 document View SEC filing for 3 FORM 3 16 Sep 2024 12 Sep 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 12 Sep 2024 12 Sep 2024 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 27 Aug 2024 26 Aug 2024
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 Aug 2024 30 Jun 2024 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 06 Aug 2024 02 Aug 2024
4 Open 4 document View SEC filing for 4 FORM 4 02 Aug 2024 02 Aug 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 30 Jul 2024 30 Jul 2024 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 24 Jul 2024 24 Jul 2024 001-41899
11-K Open 11-K document View SEC filing for 11-K 11-K 27 Jun 2024 31 Dec 2023 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 04 Jun 2024 04 Jun 2024 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 23 May 2024 22 May 2024 001-41899
SC 13G Open SC 13G document View SEC filing for SC 13G 21 May 2024 005-94523
4 Open 4 document View SEC filing for 4 FORM 4 21 May 2024 15 May 2024
4 Open 4 document View SEC filing for 4 FORM 4 16 May 2024 16 May 2024
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 10 May 2024 31 Mar 2024 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 09 May 2024 08 May 2024
4 Open 4 document View SEC filing for 4 FORM 4 01 May 2024 29 Apr 2024
4 Open 4 document View SEC filing for 4 FORM 4 30 Apr 2024 26 Apr 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 24 Apr 2024 24 Apr 2024 001-41899
ARS Open ARS document View SEC filing for ARS ARS 12 Apr 2024 31 Dec 2023 001-41899
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 12 Apr 2024 001-41899
DEF 14A Open DEF 14A document View SEC filing for DEF 14A DEF 14A 12 Apr 2024 22 May 2024 001-41899
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 28 Mar 2024 31 Dec 2023 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 22 Mar 2024 11 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 19 Mar 2024 19 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 12 Mar 2024 06 Mar 2024
4/A Open 4/A document View SEC filing for 4/A FORM 4/A 11 Mar 2024 08 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 11 Mar 2024 08 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 06 Mar 2024 05 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2024 04 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2024 04 Mar 2024
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2024 01 Mar 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 29 Feb 2024 28 Feb 2024 001-41899
3 Open 3 document View SEC filing for 3 FORM 3 08 Feb 2024 01 Feb 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 06 Feb 2024 01 Feb 2024 001-41899
4 Open 4 document View SEC filing for 4 FORM 4 17 Jan 2024 11 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 12 Jan 2024 11 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 10 Jan 2024 08 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 08 Jan 2024 05 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 05 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 03 Jan 2024 02 Jan 2024
4 Open 4 document View SEC filing for 4 FORM 4 02 Jan 2024 28 Dec 2023
4 Open 4 document View SEC filing for 4 FORM 4 02 Jan 2024 28 Dec 2023
4 Open 4 document View SEC filing for 4 FORM 4 29 Dec 2023 28 Dec 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K NB BANCORP, INC. FORM 8-K DECEMBER 27, 2023 27 Dec 2023 27 Dec 2023 001-41899
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
S-8 Open S-8 document View SEC filing for S-8 NB BANCORP, INC. FORM S-8 REGISTRATION STATEMENT DECEMBER 27, 2023 27 Dec 2023 333-276286
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
3 Open 3 document View SEC filing for 3 FORM 3 27 Dec 2023 27 Dec 2023
CERT Open CERT document View SEC filing for CERT 27 Dec 2023 001-41899
8-A12B Open 8-A12B document View SEC filing for 8-A12B NB BANCORP, INC. FORM 8-A DECEMBER 27, 2023 27 Dec 2023 001-41899
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 21 Dec 2023 21 Dec 2023 333-272567
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 22 Nov 2023 30 Sep 2023 333-272567
424B3 Open 424B3 document View SEC filing for 424B3 424B3 20 Oct 2023 333-272567
424B3 Open 424B3 document View SEC filing for 424B3 424B3 20 Oct 2023 333-272567
EFFECT Open EFFECT document View SEC filing for EFFECT 12 Oct 2023 333-272567
8-K Open 8-K document View SEC filing for 8-K FORM 8-K 12 Oct 2023 12 Oct 2023 333-272567
CORRESP Open CORRESP document View SEC filing for CORRESP 10 Oct 2023
CORRESP Open CORRESP document View SEC filing for CORRESP 10 Oct 2023
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 10 Oct 2023 333-272567
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 02 Oct 2023 333-272567
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 29 Sep 2023 333-272567
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 01 Sep 2023 333-272567
CORRESP Open CORRESP document View SEC filing for CORRESP 08 Aug 2023
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 08 Aug 2023 333-272567
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 01 Aug 2023
CORRESP Open CORRESP document View SEC filing for CORRESP 27 Jul 2023
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 27 Jul 2023 333-272567
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 06 Jul 2023
S-1 Open S-1 document View SEC filing for S-1 FORM S-1 09 Jun 2023 333-272567

About this filer

NB Bancorp, Inc. files with the SEC under CIK 0001979330. This page aggregates EDGAR filings and related ownership activity.

Industry: Savings Institutions, Not Federally Chartered.

See insider transactions for this issuer.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.

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