Eureka Acquisition Corp., a Cayman Islands exempted company, has entered into a new financing agreement with Hercules Capital Management Corp, its sponsor, through the issuance of an unsecured promissory note valued up to $300,000. This arrangement, dated August 25, 2025, provides Eureka Acquisition Corp. with flexible funding to support general working capital needs. The note is interest-free and must be repaid upon the completion of the company's initial business combination or the expiration of its term. Notably, the sponsor has the option to convert the loan into private units of the company, which will include Class A ordinary shares and rights to additional shares upon a business combination. This agreement leverages an exemption from registration under the Securities Act of 1933.