Here is Jaroslaw Olech‘s 365.5 kg Squat (@ 72.78 kg, that’s 5x his body weight!) from the 2011 IPF World Championships.
Complete meet videos can be found here (74kg Squat, Bench Press, Deadlift 1 & 2).
Here is a little documentary about Jaroslaw.
Best of Olympic Weightlifting
His bodyweight in the comp was 72.78kg so it was over 5x bodyweight!
Mind boggling! Thanks for the info Jonny