Shares of the following companies are showing unusual moves in Friday's trading session .
Among the winners, Georgia Gulf rose sharply after Westlake Chemical offered to buy the building-product maker for $30 a share in cash.
To the downside, Metabolix , a marker of biodegradeble plastic, fell on news that Archer Daniels Midland was terminating a joint venture with the company.
By The Numbers | Stocks on the Move Now
