The 2009 Inc. 500: The Top 10 Women-Run Companies
Mary Ellen Trevino, Owner, P3S Corporation
Rank: No. 17
Location: San Antonio
Revenue: $13,542,291 in 2008
P3S Corporation is a minority, woman-owned 8(a) and Small Disadvantaged Business (SDB) that provides IT network and physical security services mostly to the Defense Department.