Exhibit 21.1

List of Subsidiaries

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

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

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