X0508 4 2025-11-09 0 0001844971 Greenidge Generation Holdings Inc. GREE 0002063654 Krug Christopher J. C/O GREENIDGE GENERATION HOLDINGS INC. 1159 PITTSFORD-VICTOR ROAD, SUITE 240 PITTSFORD NY 14534 1 0 0 0 0 Class A Common Stock 2025-11-09 4 A 0 22500 0 A 174107 D Class A Common Stock 250000 I CHC Fund Partners I LP This Form 4 is being filed late due to an inadvertent administrative oversight and not any error of the Reporting Person. Represents restricted stock units ("RSUs") granted pursuant to the Issuer's Third Amended and Restated 2021 Equity Incentive Plan for service as a member of a special committee of the Issuer's Board of Directors. Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. The RSUs vest six months after the grant date. /s/ Christopher Krug 2025-11-17