SDM 100 companies are re-ranked in the table above by their 2024 total annual gross revenue, as reported to or estimated by SDM. Five companies -- ADT, Securitas Technology, Everon, Cook & Boardman, and Pye-Barker exceeded $1 billion in revenue, while the remainder are in the millions, spanning from $863 million to over $2 million.

background image / Sacura14 / Creatas Video+ / Getty Images Plus / via Getty Images