I wish! It is a general indicator of how many shares they have at that level since they're either buying (on the bid) or selling (on the ask) their quantity of shares in those block sizes.
The bigger the block sizes on the bid side of things, the better!
The smaller the block sizes on the ask side of things, the better!
they could have 5000 to 5 million,but at this stage gauging from previous sell off and hardly any bidwacking my guess is they are thin at ask and want to sell higher.