NBBK · Nasdaq · CIK 0001979330

NB Bancorp, Inc.

NB Bancorp, Inc.’s most recent SEC filing in our snapshot is a Form 8-K filed on Oct 15, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $335.7M and net income of $50.3M, according to its XBRL data on EDGAR. Its EDGAR record lists 43 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$335.7M
Net income, FY2025
$50.3M
Form 4 filings on record, past 12 months
43

Company overview

Legal name (as filed)
NB Bancorp, Inc.
Ticker
NBBK
SEC Central Index Key (CIK)
0001979330
Business address
NEEDHAM, MA
State or country of incorporation
—
Fiscal year ends
December 31
SEC filer category
<br>Emerging growth company
Position in SEC ticker list
#2428 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from NB Bancorp, Inc.’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$121.0MFY2022$222.2MFY2023$292.5MFY2024$335.7MFY2025
Net income
$30.1MFY2022$9.8MFY2023$42.1MFY2024$50.3MFY2025
NBBK annual results
ItemFY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$121.0M$222.2M$292.5M$335.7M
Net income$30.1M$9.8M$42.1M$50.3M
Diluted EPS—$0.23$1.07$1.34
Total assets$3.6B$4.5B$5.2B$7.0B
Cash and equivalents$156.5M$272.6M$363.9M$407.6M

XBRL tags used: revenue = InterestAndDividendIncomeOperating; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

NBBK latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Mar 3, 202610-KAnnual report· period Dec 31, 2025Document · Index
Aug 7, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Oct 15, 20268-KResults of operations; Regulation FD disclosure; Other events· period Oct 15, 2026Document · Index
Mar 27, 2026DEF 14ADefinitive proxy statement· period Apr 29, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about NB Bancorp, Inc., by form type:

4 ×184/A ×78-K ×610-Q ×2SCHEDULE 13G/A ×23 ×111-K ×1DEF 14A ×1ARS ×110-K ×1
NBBK recent filings
FiledFormWhat it isOriginal
Oct 15, 20268-KResults of operations; Regulation FD disclosure; Other events· period Oct 15, 2026Document · Index
Aug 21, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 20, 2026Document · Index
Aug 21, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 20, 2026Document · Index
Aug 18, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 7, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 22, 20268-KResults of operations; Regulation FD disclosure; Other events· period Jul 22, 2026Document · Index
Jun 25, 202611-KAnnual report of employee stock plans· period Dec 31, 2025Document · Index
May 21, 20268-KOther events· period May 21, 2026Document · Index
May 18, 20264Statement of changes in beneficial ownership (insider trade)· period May 15, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 20264/AStatement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
May 15, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
May 13, 20268-KOther events· period May 12, 2026Document · Index
May 8, 202610-QQuarterly report· period Mar 31, 2026Document · Index
Apr 29, 20268-KShareholder vote results· period Apr 29, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 27, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 24, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 24, 2026Document · Index
Apr 22, 20268-KResults of operations; Director or officer change; Other events· period Apr 22, 2026Document · Index
Mar 30, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 9, 2026Document · Index
Mar 30, 20263Initial statement of beneficial ownership· period Mar 2, 2026Document · Index
Mar 27, 2026DEF 14ADefinitive proxy statement· period Apr 29, 2026Document · Index
Mar 27, 2026ARSARS· period Dec 31, 2025Document · Index
Mar 27, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Mar 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Mar 6, 2026Document · Index
Mar 19, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 19, 2026Document · Index
Mar 9, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 6, 2026Document · Index
Mar 9, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 9, 2026Document · Index
Mar 3, 202610-KAnnual report· period Dec 31, 2025Document · Index
Feb 27, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 25, 2026Document · Index

Insider filing activity

43 Form 4 filings appear in NB Bancorp, Inc.’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0001979330 and XBRL company facts. NB Bancorp, Inc. on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.