Never won one.
I'm bringing the significant lack of acknowledgement from the academy up again because I read this article on deadline and some big names seem to agree.
http://www.deadline.com/2011/12/movie-moguls-talked-joked-mused-about-oscars-at-deadline-hollywoods-the-contenders/
JEFF ROBINOV, PRESIDENT OF WARNER BROS (You woud expect him to say it, but still counts for something)
ROBINOV: “I think the quality of Harry Potter films has been somewhat discounted. Especially the last one. It feels like the type of movie that traditionally would receive some Oscar attention. Also Inception was a very bold movie, yet it was not rewarded for risk-taking, I do think there is some bias against Hollywood and the resources that it has. Nice when a movie like Titanic actually gets what it deserves.”
WEINSTEIN: “Not only that we get to make some great movies and inspire other studios to finance some great movies instead of some of the movies that studios sometimes do. [Lots of laughs]. Harry Potter is a seminal franchise. I’m going to agree with Jeff: that franchise is not getting the respect that it should. An entire generation grew up into those films. For the young generation, it was a seminal experience saying goodbye to a franchise. [Harry Potter And The Deathly Hallows Part 2] is as good as any movie that’s in competiton this year.”