Exhibit 99.1 Contact: Wallace R. Cooney For Immediate Release (703) 345-6470 October 29, 2025 GRAHAM HOLDINGS COMPANY REPORTS THIRD QUARTER EARNINGS ARLINGTON, VA - Graham Holdings Company (NYSE: GHC) today reported its financial results for the third quarter of 2025. The Company also filed its Form 10-Q today for the quarter ended September 30, 2025 with the Securities and Exchange Commission. Division Operating Results Revenue for the third quarter of 2025 was $1,278.9 million, up 6$1,207.2 million ...