The SDM 100, SDM Magazine's report of the 100 largest electronic security firms in the United States has long been a cornerstone of the industry. When first published in May 1991, it took many people by surprise to view, for the first time in print, the financial figures of the industry's giants; nearly all of the largest firms are privately held and aren't required to release their earnings. The SDM 100 soon became a mainstay reference for alarm company acquirers, product vendors, investors, bankers, consultants, and the ranked companies themselves as they employed it in their marketing programs.
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