Check out which companies are making headlines before the bell Friday:
FireEye - The cybersecurity company is buying computer forensics specialist Mandiant in a $1.05 billion cash and stock deal.
Boeing – Boeing machinists will vote on the company's 8-year contract offer. The jet maker has said it would locate key 777X assembly operations in Washington state if the union approves and would seek other locations if the contract is rejected.
General Mills – The cereal maker has begun producing its iconic Cheerios cereal without genetically modified content, to address growing controversy over the use of so-called GMOs.
General Electric – GE was downgraded by Oppenheimer to "perform" from "outperform", saying the stock's price now reasonably reflects earnings expectations.
Yahoo – Stifel Nicolaus raised its price target for Yahoo to $49 from $40, saying the eventual distribution of Alibaba shares to stockholders could add up to $10 to Yahoo's stock price.
Sirius XM Radio – Evercore upgraded the stock to "overweight" from "equal weight" on a valuation basis and prospects for core business growth.
Lindsay Corp. – The maker of irrigation equipment doubled its quarterly dividend to 26 cents per share from 13 cents.
Micron Technology – RBC Capital downgraded the chipmaker's stock to "sector perform" from "outperform", following a year in which Micron was one of the top percentage gainers in the S&P 500.
Joy Global – Goldman Sachs cut its rating on the mining equipment maker to "sell" from "neutral."
—By CNBC's Peter Schacknow.
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