Exhibit 21
List of Subsidiaries
The following is a list of subsidiaries of Ascent Media Corporation, the names under which such subsidiaries do business, and the state or country in which each was organized, as of February 28, 2011. 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. | Texas | |
| Monitronics Canada, Inc. | Canada | |
| MI Servicer HC, LLC | Delaware | |
| MI Servicer LP, LLC | Delaware | |
| MI Servicer GP, LLC | Delaware | |
| MIBU Servicer Inc. | Delaware | |
| Monitronics Security LP | Delaware | |
| MI Funding HC, LLC | Delaware | |
| MI Funding LP, LLC | Delaware | |
| MI Funding GP, LLC | Delaware | |
| Monitronics Funding LP | Delaware | |
| Four Media Company, LLC | Delaware | |
| Todd-AO, Espana | California | |
| 103 Todd-AO Estudio S.L. | Spain | |
| Ascent Media Holdings Limited | England | |
| Ascent Media Limited | England | |
| Rushes Televisión, S.A. de C.V. | Mexico | |
| Servicios Administravos de Post Produccion S.A. de C.V. | Mexico | |
| Ascent Media GP Ltd. | England | |
| Ascent Media UK Limited Partnership | England | |
| Ascent Media Property Holdings, LLC | Delaware | |
| Ascent Media Systems Integration, LLC | Delaware | |
| DHC Pramer Acquisition, Inc. | Delaware |