I could be wrong but I think it was Funimation that dubbed and released the first season originally.
While I do have sympathy for people who watch dubs for one reason or another, Familiar of Zero is a Rie Kugimiya show so it's not all bad if you're forced to listen to the Japanese. As a side effect, knowing the Japanese for "shut up" and "idiot" will probably let you watch a good deal of the show without even needing the subtitles.