0001288847 2019-11-12 2019-11-12 false 0001288847 8-K 2019-11-12 FIVE9, INC. DE 001-36383 94-3394123 Bishop Ranch 8 4000 Executive Parkway, Suite 400 San Ramon, CA 94583 925 201-2000 false false false false Common stock, par value $0.001 per share FIVN NASDAQ false