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Who Bought A Large Number Of Shares?
The reality that the share price did not move shows that there is nothing nefarious going on.  It is most likely some mutual fund offloading their position to another fund.   You can commonly see the play out at market openings if you have access to level II data.  You will see a big block sitting on both sides of the same bid/ask.  If you put in a higher bid (or vice versa) the two positions will move to match yours.  And when the market opens their trade will be transacted BEFORE yours, even though you are thinking ... 'well I put in my bid first'.  Obviously they have agreed to swap and agreed to use whatever value the market decides.