massive buys at close

Both yesterday and today (That I have noticed) my last 10 trade views on E trade have shown huge volumes of buys at the closing price. This is what I saw today:

04:10:10 PM 0.800 30,000
04:10:10 PM 0.800 14,100
04:10:10 PM 0.800 50,000
04:10:10 PM 0.800 27,094
04:10:10 PM 0.800 22,906
04:10:10 PM 0.800 50,000
04:10:10 PM 0.800 56,239
04:10:10 PM 0.800 120,855
04:10:10 PM 0.800 15,000
04:10:10 PM 0.800 3,220

And it was similar yesterday. I have noticed it on previous trading days.

Is that a good sign?