Exhibit 21

List of Subsidiaries
The following is a list of subsidiaries of Monitronics International, Inc., the names under which such subsidiaries do business, and the state or country in which each was organized, as of March 30, 2020. The list does not include dormant subsidiaries or subsidiaries which would not, if considered in the aggregate as a single subsidiary, constitute a significant subsidiary within the meaning of Item 601(b)(21)(ii) of Regulation S-K.
Subsidiary
 
Jurisdiction of Formation
Monitronics International, Inc.
 
Delaware
 
 
 
Monitronics Canada, Inc.
 
Delaware
 
 
 
MI Servicer LP, LLC
 
Delaware
 
 
 
MIBU Servicer, Inc.
 
Delaware
 
 
 
Monitronics Security LP
 
Delaware
 
 
 
Monitronics Funding LP
 
Delaware
 
 
 
Platinum Security Solutions, Inc.
 
Delaware
 
 
 
Security Networks LLC
 
Florida
 
 
 
LiveWatch Security, LLC
 
Delaware