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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 ) : April 27 , 2021 CRISPR THERAPEUTICS AG ( Exact name of Registrant as Specified in Its Charter ) 001-37923 ( Commission File Number ) Not Applicable ( IRS Employer Identification No. ) Switzerland ( State or Other Jurisdiction of Incorporation ) Baarerstrasse 14 6300 Zug , Switzerland ( Address of Principal Executive Offices ) Registrant's Telephone Number , Including Area Code : +41 ( 0 ) 41 561 32 77 Not Applicable ( Former Name or Former Address , if Changed Since Last Report ) Not Applicable ( Zip Code ) 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 ( see General Instructions A.2 . below ) : ☐ Written communications pursuant to Rule 425 under the Securities Act ( 17 CFR 230.425 ) Soliciting material pursuant to Rule 14a - 12 under the Exchange Act ( 17 CFR 240.14a - 12 ) Pre - commencement communications pursuant to Rule 14d - 2 ( b ) under the Exchange Act ( 17 CFR 240.14d - 2 ( b ) ) Pre - commencement communications pursuant to Rule 13e - 4 ( c ) under the Exchange Act ( 17 CFR 240.13e - 4 ( c ) ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Shares , nominal value CHF 0.03 Trading Symbol ( s ) CRSP Name of each exchange on which registered The Nasdaq Global Market Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 ( § 230.405 of this chapter ) or Rule 12b - 2 of the Securities Exchange Act of 1934 ( § 240.12b - 2 of this chapter ) . Emerging growth company ☐ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . ☐