FORM 10-K ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _________ to _________ Commission File Number: 001-41224 ABPRO HOLDINGS, INC.(Exact name of registrant as specified in its charter) Delaware87-1013956(State or other jurisdiction ofincorporation or organization)(I.R.S. EmployerIdentification Number) 100 Summit Drive, Burlington, Massachusetts 01803(339) 227-5961(Address of principal executive offices, including zip code, and telephone number) Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes☐No☒ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes☐No☒ Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),and (2) has been subject to such filing requirements for the past 90 days. Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that theregistrant was required to submit such files). Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smallerreporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☐Accelerated filer☐Non-accelerated filer☒Smaller reporting company☒Emerging growth company☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectivenessof its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registeredpublic accounting firm that prepared or issued its audit report.☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of theregistrant included in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No☒ As of June 30, 2025, the aggregate market value of the Common Stock held by non-affiliates of the registrant was approximately $9.3million based on the last reported sale price of Common Stock on Nasdaq. As of March 30, 2026, there were 5,896,048 shares of Common Stock, $0.0001 par value per share, outstanding. DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s definitive proxy statement relating to its 2026 Annual Meeting of Shareholders, if filed with the Securitiesand Exchange Commission within 120 days after December 31, 2025, are incorporated by reference into Part III of this Form 10-K, orsuch Part III information will be provided in an amendment filed on Form 10-K/A within 120 days after December 31, 2025. EXPLANATORY NOTE On November 13, 2024 (the “Closing Date”), Atlantic Coastal Acquisition Corp. II (“ACAB”) consummated a merger (the “Merger”)pursuant to the terms of the Merger Agreement, dated as of December 11, 2023 (the “Merger Agreement”) by and among AbproCorporation (“Legacy Abpro”), ACAB, and Abpro Merger Sub Corp., a Delaware corporation (“Merger Sub”) and wholly ownedsubsidiary of ACAB prior to the Closing. Pursuant to the Merger Agreement, on the Closing Date, (i) ACAB changed its name to“Abpro Holdings, Inc.” (“New Abpro”), and (ii) Merger Sub merged with and into Legacy Abpro, with Legacy Abpro as the survivingcompany in the Merger (such transactions, the “Merger,” and, collectively with the other transactions described in the MergerAgreement, the “Reverse Recapitalization”). After giving effect to the Merger, Legacy Abpro became a wholly owned subsidiary ofthe Company. Shares of the New Abpro common stock commenced trading on the Nasdaq Capital Market on