Ultimate ...

Ultimate Marvel Team-Up (2001-2002)
Wizard's Ultimate Marvel Spectacular (2002)

Ultimate Adventures (2002-2003)

Ultimate Daredevil and Elektra (2003)
Ultimate War (2003)
Ultimate Six (2003-2004)
Ultimate Nightmare (2004-2005)
Ultimate Secret (2005)
The Official Handbook of the Ultimate Marvel Universe 2005: The Fantastic Four and Spider-Man (2005)
The Official Handbook of the Ultimate Marvel Universe: The Ultimates and X-Men 2006 (2006)
Ultimate Extinction (2006)

Ultimate Power (2006-2008)

Ultimate Vision (2007-2008)

Ultimate Civil War: Spider-Ham (2007)

Ultimate Marvel Sampler (2007)

Ultimate Human (2008)

Ultimate Secrets (2008)

Ultimate Origins (2008)

Marvel Spotlight: Ultimate Universe (2009)

Ultimate Armor Wars (2009-2010) ↔ Ultimate Comics Armor Wars (2009-2010)

Ultimate Enemy (2010)

Ultimate X (2010-2011)

Ultimate New Ultimates (2010-2011)

Ultimate Mystery (2010)

Ultimate Thor (2010-2011)

Ultimate Doom (2011)

Ultimate Fallout (2011)

Ultimate Comics Hawkeye (2011-2012) ↔ Ultimate Hawkeye (2011-2012)

Ultimate End (2015-2016)

Reprints:

Ultimate Marvel Magazine (2001-2002)
Ultimate Team-Up Special Edition (2001)

Ultimate Power Director's Cut (2007)
 

See also:
Cataclysm series

Marvel Flip Magazine

Ultimate Avengers

Ultimatum