SEI Chart, page-134

He or she is not using those amounts they are just broken orders from the buyer ....example 1 buyer for 510.000 shares may equal 7 sells from the 1 seller this happened on Wed,Thu Fri I know because I was the 1 Buyer , I received 7 lots to make my 510,000 on Friday , my Broker got the trades all from one person I was buying at 2.1 and the same seller waited until I bought the lot ,then dumped in more at 1.9 I got them as well. Another 11,000.
This was all 1 seller trading out of Singapore.