one site I found agrees with the brokers' and my opinion Traders can also analyze the ECN order sizes to check for irregularities. One can see if an institutional player is trying to keep the buying quiet; this could indicate that there is either an accumulation or buyout is taking place. More often, this technique is used simply to accumulate shares when building big position. now why would anyone want such a big position if the core results are bad and the company is a joke as you would say?