McGrath RentCorp engages in the provision of business-to-business rental services. It operates through the following segments: Mobile Modular, TRS-RenTelco, Portable Storage, and Enviroplex. The Mobile Modular segment is engaged in modular building and portable storage. The TRS-RenTelco segment includes operations for its electronic test equipment. The Portable Storage segment includes rental inventory consisting of steel containers used to provide a temporary storage solution that is delivered to the customer’s location and addresses the need for secure, temporary storage with immediate access to the unit. The Enviroplex segment involves the classroom manufacturing business selling modular buildings used primarily as classrooms in California. The company was founded by Robert P. McGrath in 1979 and is headquartered in Livermore, CA.