0001501989 2023-05-09 2023-05-09 0001501989 false 8-K 2023-05-09 CytomX Therapeutics, Inc. DE 001-37587 27-3521219 151 Oyster Point Blvd Suite 400 South San Francisco CA 94080 650 515-3185 false false false false Common Stock, $0.00001 par value per share CTMX NASDAQ false