Cartesian Growth Corp III 8-K

What Happened Cartesian Growth Corp III (CGCT) announced that the joint registration statement on Form S-4 in connection with its proposed business combination with Factorial, a U.S.-based solid-state battery company, was declared effective by the SEC on May 6, 2026. Cartesian III scheduled an extraordinary general meeting of shareholders for 10:00 a.m. Eastern Time on May 27, 2026 to vote on the proposed business combination. A press release dated May 11, 2026 (Exhibit 99.1) was attached to the 8-K.

Key Details

• SEC declared the joint Form S-4 effective on May 6, 2026; the S-4 includes the definitive proxy statement/prospectus.
• Extraordinary shareholder meeting set for May 27, 2026 at 10:00 a.m. ET.
• Record date for mailed proxy materials: shareholders of Cartesian III as of May 1, 2026.
• Business Combination Agreement dated December 17, 2025 (among Cartesian III, Fenway MS, Inc., and Factorial); proxy/prospectus mailed to shareholders and available on SEC.gov.

Why It Matters S-4 effectiveness is a key regulatory step that enables the formal proxy solicitation and the offering of the securities to be issued to Factorial stockholders upon closing. The scheduled May 27, 2026 shareholder meeting is the date when Cartesian III shareholders will vote on approving the merger; the proxy/prospectus contains the transaction terms, risks and details investors need to review before voting or making investment decisions. Investors can obtain the definitive proxy/prospectus and other filings free at www.sec.gov or by request to Cartesian Growth Corporation III.