CHICAGO--(BUSINESS WIRE)--GTCR, a leading private equity firm, announced today that it has signed a definitive agreement to sell Protection 1 (“Protection 1” or the “Company”) to Apollo Global Management. Protection 1 is among the largest providers of security alarm monitoring in the United States. The Company provides installation, maintenance and monitoring of security systems for residential, commercial and national accounts customers nationwide. Protection 1 serves nearly two million custom