0000939767 2019-10-07 2019-10-07 false 0000939767 8-K 2019-10-07 EXELIXIS, INC. DE 000-30235 04-3257395 1851 Harbor Bay Parkway Alameda CA 94502 650 837-7000 false false false false Common Stock $.001 Par Value per Share EXEL NASDAQ false