I don't know what Blackstone put into their 21% stake but I would hope they lost their shirts on this "investment". Through their policies (and Blackfish) the stock is severly depressed so even with the 33% over price premium they got I can't think that they made money on this deal.
This TPI article says 2.3B +400M was the price back in 2009 but it also says 100% so they have diluted their stake quite a bit if they only sold a 21% stake now so they could have all their money back before this sale and all this is just gravy. Or maybe I don't have a clue and don't really know anything. The comments attached to the article are amusing. Certainly the ones hailing a new day compared to INBev ownership.
This Bloomberg article sheds more light on how much Blackstone may have made on this
Last edit: back of the envelope math shows they are short about 330M from their initial investment. Does not count any dividends or other considerations Blackstone received over the 8 year life of this deal so maybe they broke even. The opportunity cost of 2.7B over 8 years in a market that more than doubled in that time is a huge loss. I wonder if they will change their way of doing business in the future?