Can someone explain the last trade of the day in this stock?...

Can someone explain the last trade of the day in this stock? What do you make of this?
I continued to refresh the screen after the close just to see what happened after the activity of the day and saw the following.
On the close there was a spread of buy at 74.0c and sell and sell at 77.0c. On close a sell of 6641 shares at 74c appeared and almost immediately a buy order for 6640 shares at 74.5c. Coincidence??
Then buy of 10000 at 74.5c and almost immediately the buy 6640 was moved up to 75.0c. Then it changed to buy 8000 at 75.0c. That did become the last trade. 6640 were sold at 75c.
Any thoughts??