The 2012 SDM 100 ranks U.S. companies that provide electronic security systems and services to both residential and non-residential customers. This ranking is based on information provided to or, in few cases, estimated by SDM. Ranked companies were asked to submit either an audited or reviewed financial statement, or a copy of their income tax return showing total gross receipts for the stated period. The vast majority of the firms ranked are privately held.
The SDM 100 has been published since 1991. Its primary objective is to measure consumer dollars gained by alarm companies, in order to present an account of the size of the market captured by the 100 largest security providers. SDM 100 firms are ranked by their recurring monthly revenue. RMR is the amount of contractually recurring revenues due from customers, for such services as monitoring, contracted service and system maintenance, and leasing of security systems.