The studio is known for its work for the Call of Duty series, which it develops alongside Infinity Ward, Sledgehammer Games and Raven Software.

Call of Duty: Black Ops II held the record for the largest entertainment launch in history in any form of entertainment, breaking the record within 24 hours of its release until it was surpassed by Grand Theft Auto V.[7] Sales from the game worldwide reached US$650 million within five days after its release.

[8] Treyarch worked on the Wii U version of Call of Duty: Ghosts, in order to optimize it for the console.

[9] Dan Bunting, who had been co-lead of Treyarch since around 2003, was named in an investigative report by The Wall Street Journal related to the lawsuit filed against Activision Blizzard by the state of California over workplace misconduct and discrimination.

Bunting had reportedly mistreated an employee in 2017, but was kept on by Activision Blizzard's CEO, Bobby Kotick.