Summit Structures and its parent, Cover-All Building Systems Inc., had no immediate comment. Former Summit attorney Tom Fee says the company was dissolved in bankruptcy.
The Dallas Morning News reports Briles is also suing engineering company JCI Holding LLC. A company phone number was not accepting messages Wednesday.
Special teams coach Joe DeCamillas suffered a broken vertebrae in the accident. Cowboys scout Rich Behm was left paralyzed from the waist down. Tight end Jamar Hunt, from Texas-El Paso, suffered a herniated disk.
Briles is the daughter of Baylor football coach Art Briles.