33.3% First-party
Sony - 10
Ubisoft - 5
Warner Bros. - 5
Nippon Ichi - 4
Sega - 2
Limited Run - 1
PQube - 1
Rising Star - 1
Vblank - 1
Note: This counts The Walking Dead: Season One for Sony since it published the retail Vita version and Persona 4 Golden for Nippon Ichi since it published the PAL version (it's in small print on the back of the box). If you want to count those for Telltale and Atlus respectively, then knock my percentage down to 30%.