exhibit31-archarter

Delaware The First State Page 1 3368090 8100 Authentication: 203985532 SR# 20262730801 Date: 05-20-26 You may verify this certificate online at corp.delaware.gov/authver.shtml I, CHARUNI PATIBANDA-SANCHEZ, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE RESTATED CERTIFICATE OF “FIVE9, INC.”, FILED IN THIS OFFICE ON THE TWENTIETH DAY OF MAY, A.D. 2026, AT 11:42 O`CLOCK A.M. Exhibit 3.1