Atlantic stal Acquisition II(ACAB) - Prospectus

As filed with the U.S. Securities and Exchange Commission on November 7, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Abpro Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (Primary Standard Industrial Delaware 2834 87-1013956 (I.R.S. Employer Identification No.) (State or other jurisdiction of incorporation or organization) Classification Code Number) 100 Summit Drive ...