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Delaware ( State or other jurisdiction of incorporation or organization ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 8 - K CURRENT REPORT Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 Date of report ( Date of earliest event reported ) : May 6 , 2021 GUARDANT HEALTH , INC . ( Exact name of registrant as specified in its charter ) 001-38683 ( Commission File Number ) 505 Penobscot Dr. Redwood City , California 94063 ( Address of principal executive offices ) ( Zip Code ) 855-698-8887 ( Registrant's telephone number , include area code ) N / A ( Former Name or Former Address , if Changed Since Last Report ) 45-4139254 ( I.R.S. Employer Identification No. ) Check the appropriate box below if the Form 8 - K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions :