Take a look at some of Friday's midday movers:
Agilent Technologies - Shares of the maker of scientific instruments rallied a day after it reported adjusted earnings that beat Wall Street estimates.
J.C. Penney Co. - The troubled department-store operator's shares jumped after a number of hedge funds bought positions in the company.
Mead Johnson Nutrition - The maker of infant formula advanced on news that China might be readying to relax its one-child policy, with the development viewed as representing potential market expansion for the company.
Iron Mountain - The technology company, which is looking to change to a real estate investment trust, gained after it said in a regulatory filing that the Internal Revenue Service planned to resume working on its eligibility.
Western Union - Shares of the money-transfer company fell a day after it said longtime Chief Financial Officer Scott Scheirman would step down at the end of the year.
Exxon Mobil - Shares of the oil giant and Dow component rose after Warren Buffett's Berkshire Hathaway disclosed a stake.
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—By CNBC's Kate Gibson
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