QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q Commission File Number: 001-40808 Greenidge Generation Holdings Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 86-1746728 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 590 Plant Road, Dresden, NY 14441 14441 (Address of principal executive offices) (Zip C ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _____________________ to _____________________ Commission File Number: 001-40808 Greenidge Generation Holdings Inc. (Exact Name of Registrant as Specified in its C ...