Around 44k BTC were involved over the past 4 dumpings on the 17th (34k BTC) and the 20st (10k BTC), when the price was brought down from around 8.8 to 7.8$ in a big dump. Those two combined bring the total USD aquired in those moves to ~450000 USD.*
Around 70k BTC were then bought 4 hours ago driving the price up from 8.81 USD to 9.70 USD, equalling an average price of 9.255 USD/BTC for all the USD spent. That means, around 647850 USD were sold for 70k BTC.*
In combination, those 44k BTC spent from the 17th to the 20st of July have yielded around 4500 BTC today in pure profit. He also bought additional 21500 BTC today, driving his total balance to 70k BTC. There maybe more that we just dont see yet.
IF this is the only player of that caliber right now, one would expect him to move the price in the other direction, once he can gain higher average prices for his sell. As soon as a 70k BTC dump would score more then the 647850 USD spent, one can expect a huge sell to happen. Especially as this player has shown signs of megalomania and expressed affection for large swings.
*Volumes taken from clarmoody.com and bitcoincharts.com
so, if we assume the Sells and the Buys were both him. His strategy is to sell low and buy high? ;p