Exhibit 99.1 News Release For more information contact: Media Relations: Stacy Davidson Chief Communications and Marketing Officer Fiserv, Inc. stacy.davidson@fiserv.com Investor Relations: Walter Pritchard Senior Vice President, Investor Relations Fiserv, Inc. walter.pritchard@fiserv.com For Immediate Release Fiserv Reports First Quarter 2026 Results GAAP revenue decrease of 2% and organic revenue decrease of 4%; GAAP EPS decreased 29% and adjusted EPS decreased 16%; Company affirms 2026 organic revenue gr ...