Check out the companies making headlines after the bell Wednesday:
Shares of Viacom got a boost after Sumner Redstone's physicians publicly attested that he is , says William Schwartz, chairman of Viacom's governance and nominating committee. Schwartz addressed the topic in an email to Reuters Wednesday afternoon.
American Eagle Outfitters moved higher on positive news about its holiday sales. The teen apparel retailer said the season is off to a "solid start" and named interim CEO Jay Schottenstein as its permanent CEO.
Shares of Avon Products inched up after hours on unsubstantiated chatter about the possibility of Oprah Winfrey taking a stake in the cosmetics retailer. Avon declined to comment on the rumors; a spokesperson for Oprah Winfrey denied that the media mogul was taking a stake.
After closing down more than 60 percent, shares of Zafgen were slightly higher in extended trade. , the biotechnology company reported a second patient death in a late-stage clinical trial of its lead drug candidate, beloranib.
Yahoo moved up after it was reported that the tech company is mulling an activist shareholder's demand to sell its key Internet services.
Hunting and outdoor merchandise retailer Cabela's was up on news that it is potentially seeking a buyer as it faces pressure from activist investor Elliott Management.
Shutterfly, a digital-photo company, popped after announcing record revenue over the "Black Friday" weekend and that CEO Jeffrey Housenbold will resign.
— Reuters and AP contributed to this report.