Ultimate X-Men

Ultimate X-Men (I) (2001-2009)
Ultimate X-Men (2003)
Ultimate X-Men Annual (2005-2006)
The Official Handbook of the Ultimate Marvel Universe: The Ultimates and X-Men 2006 (2006)
Ultimate X-Men/Fantastic Four (2006)

Ultimate Fantastic Four/X-Men (2006)

Ultimate Fantastic Four/Ultimate X-Men Annual (2008)

Ultimate X-Men/Ultimate Fantastic Four Annual (2008)

Ultimatum: X-Men Requiem (2009)

Ultimate X-Men (II) (2011-2013)Ultimate Comics X-Men (2011-2013)

Cataclysm: Ultimate X-Men (2014)


Reprints:

Ultimate X-Men Collected Edition (2001)

Ultimate X-Men (Free Comic Book Day Edition) (2003)
Marvel Milestones: Ultimate Spider-Man, Ultimate X-Men, Microman, Mantor the Magician (2006)

Ultimate X-Men MGC (2011)

See also:
Other Ultimate series

Target Ultimate X-Men ...

X-Men series