Insider Ownership Filing - Five9, Inc.

This filing reports the initial ownership of Robert Hornish, Chief Sales Officer of Five9, Inc. (FIVN), as of June 29, 2026. Mr. Hornish, through his reporting owner ID 0002144579, has reported no direct or indirect ownership of Five9 securities. The filing, designated as Form 3, indicates this is an initial statement of beneficial ownership. The reporting owner is located at 3001 Bishop Drive, Suite 350, San Ramon, CA 94583. The filing was signed by Tiffany Meriweather, Attorney in Fact, on July 9, 2026.