Take a look at some of Wednesday's midday movers:
Sears fell on a report that a vendor withheld shipments due to insurers reducing coverage.
J.C. Penney moved lower after its CFO made a bearish presentation on future earnings by cutting the retailer's fourth-quarter sales forecast.
Chimerix and Tekmira fell on news of the , Thomas Eric Duncan. He was being treated with .
Janus Capital fell. The investment firm's bond fund managed by Bill Gross had $66.4 million in September inflows, according to Morningstar.
Amgen gained ground after the pharmaceutical company said its copycat version of AbbVie's blockbuster biotech drug Humira succeeded in skin disease trial.
Monsanto moved a bit higher in a volatile morning of trading. The agrochemical company posted a larger-than-expected fourth-quarter loss, but revenues came in better than expected.
EMC gained some ground on news activist investor Elliott Management urged the company to spin off its VMware software unit.
GoPro moved lower after hitting a record high on Tuesday. Piper Jaffray downgraded the active sports camera maker to "neutral" from "overweight" while maintaining a $90 price target.
Cogent Communications rose after Raymond James upgraded the stock to "outperform" from "market perform," with a $35 price target.
Greif moved higher after Wells Fargo upgraded the industrial packaging company to "outperform," citing its restructuring efforts.