1975-04-04 : Microsoft was founded 1991 : Bungie was founded 2009 : 343 Industries was founded 2001 : Halo : Combat Evolved, Xbox & The Fall of Reach 2004 : Halo 2 2007 : Halo 3 2010 : Halo Reach 2009 : Bungie independent 2015 : Halo : Guardians 2012 : Halo 4