Check out which companies are making headlines before the bell Friday:
JPMorgan Chase - The bank gained in premarket trading, a day after disclosing a security breach that impacted about 76 million households and 7 million small businesses.
Legacy Reserves - The developer of oil-and-gas properties fell after saying it would offer 10 million units representing limited-partnership interests at $27.38 a share.
Mylan - The generic drug manufacturer gained after hiking its third-quarter and full-year forecast.
RadioShack - The electronics retailer rose after Bloomberg reported the struggling company had reached a deal with a group led by its largest shareholder to refinance loans to restock ahead of the holiday shopping season.
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