All I see is little dumps of 0.02 or the like in bitstamp. This is keeping the price from going up, who do you think would want to do this? My theory is that it could be miners with thousands of coins and no transaction fees in some Chinse bitcoin site, or flash traders with bots doing hundreds of transactions a second.
You are describing an ongoing practice of a multitude of traders, and from looking at these kinds of factors over such a short period, you cannot determine who or motive and it does not even really matter that much because the essence of the matter is that prices went up more than 10% in one day and the momentum is up, even if some folks want to slow down such upward momentum and are hoping that it will reverse.. You cannot really tell what is going to happen, including if someone might be preparing to dumb 1000 coins.. and maybe get some success and maybe not.