You cats gotta be on hard drugs running with this dumb ass "Drake owns a percentage of EVERYTHING" theory.
UMG is a publicly traded company. Meaning, if Drake owned a % it would be public record. Not to mention the share holders would have to sign off on it.
This isn't something you can keep in your back pocket in case of a rap beef. This would've been covered by every media outlet on the planet, and the info would've been readily available even before that, because again, it's a publicly traded company.
EDIT:
And people keep quoting the Budden shyt as "proof" when #1 he said he's guessing and #2 half the shyt people are attributing to him, he never said. It was started by some random Drake fan on Twitter who said himself he had no proof, and was just theory crafting.
Fred.