You have to look beyond the obvious. When a company sells large blocks of shares, thus dropping the pps, it knows what it's doing. This selling action does two things the company likes. One, it brings in immediate money to fund other projects, and two, it lowers the pps so that the company can buy more shares cheaper than before in anticipation of a run up on good news the company plans on releasing. Then the company can sell again, and repeat the process, all the while increasing its Market Cap. You could call it a win-win situation.
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