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Exhibit 21.1

List of Subsidiaries

Greenidge Generation Holdings Inc.’s subsidiaries are listed below.

Name of Subsidiary						Jurisdiction of Formation
Greenidge Generation LLC						New York
Lockwood Hills LLC						New York
Greenidge Solar LLC						Delaware
Greenidge Pipeline LLC						Delaware
Greenidge Pipeline Properties Corporation						New York
Greenidge Markets and Trading LLC						Delaware
Greenidge Generation Blocker Inc.						Delaware
Greenidge Generation Holdings LLC						Delaware
Greenidge Secured Lending LLC						Delaware
Support.com, Inc.						Delaware
Greenidge Texas LLC						Delaware
GNY Collateral Holding LLC						Delaware
GNY Collateral LLC						Delaware
Greenidge British Columbia ULC						Canada
GTX Gen 1 LLC						Delaware
GTX Gen 1 Collateral Holding LLC						Delaware
GTX Gen 1 Collateral LLC						Delaware
GTX Dev 1 LLC						Delaware
Greenidge South Carolina LLC						Delaware
GSC Collateral Holding LLC						Delaware
GSC Collateral LLC						Delaware
GSC RE LLC						Delaware
GSC DemoCo LLC						Delaware
300 Jones Road LLC						Delaware
GGHI Inactive Holdings LLC						Delaware
Greenidge Mississippi LLC						Mississippi
Greenidge North Dakota, LLC						Delaware