Graham Corporation filed a Form 8-K reporting that on June 18, 2026, it posted a slide presentation to the investor relations section of its website in connection with the company’s 2026 Investor Day, held the same day. The filing was made under Item 7.01, Regulation FD Disclosure, indicating the company is furnishing information to ensure broad public access to materials being used in investor communications. The presentation was included as Exhibit 99.1 and described as the “Slide Presentation for June 18, 2026 Investor Day.” No securities issuance, insider transaction, acquisition, financing arrangement, executive appointment, or change in control was reported in the filing. There were no share counts, prices, transaction codes, option grants, vesting terms, or post-transaction ownership figures disclosed because the filing relates solely to investor presentation materials. Graham also included Item 9.01 for exhibits, listing Exhibit 99.1 for the Investor Day slides and Exhibit 104 for the embedded cover page interactive data file. The company stated that the Regulation FD information, including the slide presentation, is being “furnished” rather than “filed,” meaning it is not subject to certain Exchange Act liability provisions and is not automatically incorporated into Graham’s other securities filings unless specifically referenced. The report was signed on June 18, 2026, by Christopher J. Thome, Graham’s Vice President – Finance, Chief Financial Officer and Chief Accounting Officer.