| Publisher | Title | # of Issues |
|---|---|---|
| Marvel Comics | Marvel Milestones: Ultimate Spider-Man, Ultimate X-Men, Microman & Mantor the Magician (2006) | 1 |
| BOOM! Studios | UFOlogy | 1 |
| Marvel Comics | Ultimate Marvel Sampler (2007) | 1 |
| Marvel Comics | Ultimate Marvel Team-Up (2001-2002) | 9 |
| Marvel Comics | Ultimate Six (2003-2004) | 7 |
| Marvel Comics | Ultimate Spider-Man (2000-2009) | 122 |
| Marvel Comics | Ultimate Spider-Man Super Special (2002) | 1 |
| Marvel Comics | Ultimate X-Men (2001-2009) | 6 |
| Image Comics | Umbra | 3 |
| Dark Horse Comics | Umbrella Academy: Apocalypse Suite (2007-2008) | 1 |
| Dark Horse Comics | Umbrella Academy: Dallas (2008-2009) | 1 |
| Image Comics | Underground (2009-2010) | 4 |
| Image Comics | Undiscovered Country (2019-2022) | 1 |
| DC Comics | Unexpected (1968-1982) | 4 |
| DC Comics/Vertigo Comics | User (2001) | 2 |
