FuelCell Energy, Inc. reported on July 21, 2026, that it filed a prospectus supplement under its automatic shelf registration statement on Form S-3, Registration No. 333-296607. The company submitted the Form 8-K under Item 8.01, “Other Events,” solely to place on record a legal opinion from Latham & Watkins LLP regarding the legality of the issuance and sale of the securities covered by that prospectus supplement. The filing does not disclose the size of the offering, the type or amount of securities being sold, any share count, pricing terms, underwriters, or expected proceeds. Instead, it functions as a supporting filing tied to the prospectus supplement, providing the legal opinion customarily required when securities are issued under a shelf registration statement. Under Item 9.01, FuelCell listed Exhibit 5.1 as the opinion of Latham & Watkins LLP and Exhibit 23.1 as the firm’s consent, which is included within the legal opinion. The filing was signed on behalf of the company by Michael S. Bishop, Executive Vice President, Chief Financial Officer and Treasurer, on July 21, 2026. The practical significance is that FuelCell Energy is taking a procedural step connected to a securities offering under its shelf registration. While the filing itself does not announce completed sales or provide transaction economics, the legal opinion supports the company’s ability to issue and sell the securities described in the related prospectus supplement.