Exhibit 99.1 TriNet Announces First Quarter 2026 Results 11% Growth in GAAP Earnings per Diluted Share to $1.90 for the First Quarter 2026 25% Growth in Adjusted Net Income per Diluted Share to $2.48 for the First Quarter 2026 Returned Approximately $71 million to Shareholders Through Stock Repurchases and Dividends DUBLIN, Calif. — April 30, 2026 — TriNet Group, Inc. (NYSE: TNET), a leading provider of comprehensive and flexible human capital management (HCM) solutions for small and medium-size businesses ...