Cartesian Growth Corp III 8-K

What Happened
Cartesian Growth Corp III (CGCT) filed an 8-K on May 18, 2026 reporting that it issued an unsecured promissory note for $150,000 to its sponsor, CGC III Sponsor LLC. The note does not bear interest and becomes due on the earlier of the closing of the company’s initial business combination or the company’s winding up (the “Maturity Date”).

Key Details

• Principal: $150,000 issued under an unsecured promissory note dated May 18, 2026.
• Interest & maturity: No interest; payable at the earlier of the initial business combination closing or winding up.
• Conversion option: If the company completes its initial business combination, the sponsor may convert all or part of the outstanding principal into "Working Capital Warrants" at $1.00 per warrant (rounded up). Those warrants would have the same terms and transfer restrictions as the private placement warrants issued at the IPO (see May 5, 2025 prospectus).
• Default: The note contains customary events of default that can accelerate repayment. The note was issued under the Section 4(a)(2) registration exemption.

Why It Matters
This filing creates a direct financial obligation of $150,000 owed to the sponsor, which provides the company short-term working capital without interest. For investors, the key points are the lack of interest cost, the potential dilution or added warrant overhang if the sponsor converts the note into warrants upon a business combination, and the existence of acceleration provisions in the event of default. These are routine sponsor-backed working capital arrangements for SPACs but are material because they affect the company’s capital structure and potential post-combination warrant supply.