Because they were wholesale trades of some sort. Either the company buying back shares, or MEGA big investors coming in and getting deals way cheaper than retail. Either way, the trades didn't affect the MM's positions on the bid or the ask, which is interesting. Either way, its good for the company.
Edit: the most LOGICAL thing I can think of is open market swaps between MM's to bring attention to the stock.
I make my own picks with my own money and I do my own DD. Manage your own greed! Don't listen to me! I'm waaaayyyy ahead of you.
Welcome to the party, pal!