X0306 4/A 2018-06-29 2018-06-29 0 0001217234 CareDx, Inc. CDNA 0001613855 Maag Peter C/O CAREDX, INC. 3260 BAYSHORE BOULEVARD BRISBANE CA 94005 1 1 0 0 See Remarks Common Stock 2018-06-29 4 F 0 17290 12.24 D 454747 D This amendment is being filed solely to report the withholding of shares by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of vested restricted stock units. President and Chief Executive Officer /s/ Peter Maag 2018-07-12