Take a look at some of Tuesday's midday movers:

Forest Labs rebounded after it was learned through a Securities and Exchange Commission filing that Carl Icahn will nominate four people to the company’s board.

Refiners including Exxon Mobil were trading higher. A group of six refiners have agreed to pay $21.6 million in a class-action suit known as the “hot-fuel” case which claimed, refiners were charging the same price for oil that had been heated and therefore, expanded in volume as they were for oil at cooler temperatures.

FedEx rallied after the company posted quarterly profits that beat expectations and said it plans to cut costs ahead in anticipation of a gloomy outlook for global economic growth.

Chip maker Nvidia rose after Microsoft said it would use its chips to power a new tablet unveiled on Monday. The chips will be used in one version of a family of tablets to be called “Surface”—Intel chips will be used to power another version of the tablet.

SXC Health Solutions hit a 52-week high after an analyst at Bank of America Merrill Lynch raised its earnings estimates for full-year 2012 and maintained a “buy” on the stock ahead of closing its merger with Catalyst. But BofA lowered its 2013 estimates for the company.

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