In July 2009, Microsoft filed for the name 343 Industries for its new Halo development studio, after the former Halo studio, Bungie, separated from Microsoft. It was named after Halo character 343 Guilty Spark. Bungie continued making Halo games until Halo: Reach in 2010.
In July 2009, it was announced that 343 Industries was working on a seven-part Halo anime series called Halo Legends. Later that year the studio created Halo Waypoint, a downloadable application that tracks a user's Halo accomplishments. 343I also increased staff for Halo development, recruiting 20 staff from the now defunct Pandemic Studios. 343i also developed Halo: Reach's second and third map packs, entitled "Defiant" and "Anniversary" respectively, in conjunction with Certain Affinity. The company was responsible for the HD remake of Halo: Combat Evolved, titled Halo: Combat Evolved Anniversary, which was released on November 15, 2011, to celebrate the 10th year since the first franchise installment on November 15, 2001. On March 31, 2012, 343 Industries gained control of servers and data for previous Halo games from Bungie. The studio finished development of Halo 4 ahead of schedule that September. 343i completed their first official, new Halo installment, Halo 4, released on November 6, 2012, which was confirmed to be the first title of a Halo Reclaimer Trilogy. At E3 2013, Microsoft and 343 announced "Halo" for the Xbox One. Then in May 2014, and E3 '14 it was revealed that the official title is "Halo 5: Guardians" which will be released in 2015. Shortly after the initial "Halo" E3 '13 announcement, the Reclaimer Trilogy was confirmed by Microsoft Studios corporate vice president Phil Spencer to be expanded into a Reclaimer Saga. Microsoft, in a contract with Mega Bloks, is in conjunction with 343i to manufacture a new line of toys and other memorabilia for the upcoming Halo saga.
Initially developed in conjunction with Certain Affinity, the application receives regular updates including statistics, content browsing enhancements, and expanded career progression. These updates are done by 343i internally.
Developed by Bungie, 343 Industries was given control of the game and servers in August 2011. 343 and Certain Affinity developed its second and third map packs entitled "Defiant" and "Anniversary", respectively.