Allied Universal is an American provider of security systems and services; janitorial services; and staffing. The company was formed in 2016 by the merger of Santa Ana, California-based security and janitorial services company Universal Services of America, and Conshohocken, Pennsylvania-based security firm AlliedBarton Security Services. At the time of the merger, the combined company was reportedly the largest provider of security guards in the United States, with 140,000 trained officers between the two companies.

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