who's do the buying?

Looking at the last 10 trades on E*trade its goes like this;

2.12pm 288,194
2.12pm 211,806 thats 500,000 shares

2.06pm 138,194
2.06pm 61,806
2.06pm 183,194
2.06pm 16,806 thats 400,000 shares

2.04pm 283,194
2.04pm 166,806 thats 450,000 shares

There is another parcel at 2.09pm for 150,00 and 500,000 shares, this brings a total of 1,100,000 shares brought in 8 mins, the buyer has been doing this the past few days, any thoughts on the type of buyer? It's obviously the same buyer as they are buying in particular parcels

Someone obviously thinks this a good stock