Exhibit 99.1 FOR IMMEDIATE RELEASE Investor Contact: Kathryn Grissom (317) 273-9284 or kathryn.grissom@elancoah.com Media Contact: Colleen Parr Dekker (317) 989-7011 or colleen.dekker@elancoah.com Elanco Animal Health Reports First Quarter 2024 Results • First Quarter 2024 Financial Results ◦ Revenue of $1,205 million ◦ Reported Net income of$32 million, Adjusted Net income of $167 million ◦ Adjusted EBITDA of$294 million, or 24.4% of Revenue ◦ Reported EPS of $0.06, Adjusted EPS of$0.34 ◦ Net leverage r ...