I doubt even the MM's know the true buy VS sell ratio since they do not always work together and most likely do not share all info regarding transactions.
I own a lot of ENTI shares, possibly the most on this board, and let me tell you more than 50% were bought at the BID, even though I always try to buy at the ASK !
I can tell you that I bought 1.25 million more over three trades and they all came in as sells (so ya the buys and sells really mean jack its your d/d that means something !