Headed by Pierre Hintze, the studio is responsible for the Halo series of military science fiction games, originally created and produced by Bungie, and is the developer of the Slipspace Engine.

Their in-development game, Halo: Combat Evolved, turned into a launch title for Microsoft's Xbox console.

[5][1] Ross' vision for Halo also impressed Microsoft art director Kiki Wolfkill, who joined the team as a studio head.

[1] During the transition, 343 Industries worked with the company Starlight Runner to interview Bungie staff and compile a centralized story bible for the universe.

Microsoft, in a contract with Mega Bloks, is in conjunction with 343 Industries to manufacture a new line of toys and other memorabilia for the upcoming Halo saga.

[18] Halo 5: Guardians was released on October 27, 2015, with semi-exclusive content to those who purchased select Mega Bloks sets.

[19] However, the game was delayed to release in 2021, in part due to the COVID-19 pandemic forcing the 343 staff to switch to remote work.

Pierre Hintze took over as studio head, Bryan Koski became GM of the franchise and Elizabeth Van Wyck took over business and operations.