{"url_path":"/sec/nbbk/8-k/2026-05-13/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-05-13","source_url":"https://www.sec.gov/Archives/edgar/data/1979330/0001104659-26-060111-index.html","accession_number":"0001104659-26-060111","cik":"0001979330","ticker":"NBBK","issuer_name":"NB Bancorp, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1979330/0001104659-26-060111-index.html","primary_entity_key":"0001979330","primary_entity_name":"NB Bancorp, Inc."},"word_count":345,"has_tables":true,"body_markdown":"NB BANCORP, INC._May 12, 2026\n\n0001979330false00019793302026-05-122026-05-12\n\n**UNITED STATES********SECURITIES AND EXCHANGE COMMISSION********WASHINGTON, D.C. 20549**\n\n**FORM****8-K********CURRENT REPORT**\n\nPURSUANT TO SECTION 13 OR 15(D) OF\nTHE SECURITIES EXCHANGE ACT OF 1934\n\nDate of Report (Date of earliest event reported): May 12, 2026\n\n**NB BANCORP, INC.**\n\n(Exact Name of Registrant as Specified in Charter)\n\n​\n\n​\n\n​\n\n​\n\n​\n\nMaryland\n\n​\n\n001-41899\n\n  ​ ​ ​\n\n93-2560883\n\n(State or Other Jurisdiction)\n\n​\n\n(Commission File No.)\n\n​\n\n(I.R.S. Employer\n\nof Incorporation)\n\n​\n\n​\n\n​\n\nIdentification No.)\n\n​\n\n​\n\n​\n\n​\n\n​\n\n1063 Great Plain Avenue, Needham, Massachusetts\n\n02492\n\n​\n\n(Address of Principal Executive Offices)\n\n(Zip Code)\n\n​\n\nRegistrant’s telephone number, including area code: (781) 444-2100\n\nNot Applicable\n(Former name or former address, if changed since last report)\n\nCheck the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):\n\n☐\n\nWritten communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)\n\n☐\n\nSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)\n\n☐\n\nPre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))\n\n☐\n\nPre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))\n\nSecurities registered pursuant to Section 12(b) of the Act:\n\n​\n\n​\n\n**Title of each class**\n\n**  ​ ​ ​**\n\n**Trading********Symbol(s)**\n\n**  ​ ​ ​**\n\n**Name of each exchange on which registered**\n\nCommon Stock, Par Value $0.01 Per Share\n\n​\n\nNBBK\n\n​\n\nThe Nasdaq Stock Market, LLC\n\nIndicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).\n\nEmerging growth company ☒\n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐\n\n​\n\n​\n\n​\n\n​\n\n​\n\n​"}