If there really was an offer for $20 then Icahn might come in here given it's an easy 300% gain for him and his Apple buyback deal is done. Icahn could make way more cash by buying up every ARIA share he can get his hands on than going long the most expensive company on the planet.
The next 2 days ended up being the 52 week high and OCZ never got bought out and then filed for bankruptcy later that year.
In the end, the leaked rumor was a pure setup to suck in retail while the insiders and big funds exited all their holdings during the rumor caused spike. That's why you have to be careful with "leaked" rumors. In reality most all buyouts are kept secret and they only leaks end up being fake setup to allow a big fish to exit.