Every transaction has both a buyer and a seller (unless it came from the market makers pool of shares)
The BUYER paid the ASK, the SELLER sold at the ASK. It was an uptick which started the stock moving up.
The stock was trading on the bid, then the large buy came in , moved the stock up a notch. We know because in watching it the ask was taken out in a few minutes. I saw every trade on delay.
Everything I post is my own opinion and people should always do their own research and due diligence on any company they are looking at