Comcast Cut; People Gains; Marathon Drops to Session Low

Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:

- Comcast (CMCSA) shares fall after KeyBanc Capital Markets cut its recommendation to underweight from sector weight on weakness in broadband.

- People (PPLI) shares jump on a report that MGM Resorts is discussing making a bid to purchase the Barry Diller-owned media giant. 

- Shares of refinery companies decline Wednesday after Politco reports that the White House is readying a plan to ban diesel exports for 90 days.

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