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