Check out which companies are making headlines before the bell on Wednesday:
Boeing - The Federal Aviation Administration has approved the company's certification plan for the redesigned 787 battery system. Boeing will now be allowed to start testing the fix, putting it one step closer to getting the grounded Dreamliner back into service.
Oracle - Oracle shares have been upgraded to "buy" from "hold" at Canaccord Genuity, which said the company's hardware revenue will begin to increase in the next quarter or two, and that Oracle's other business will be at least as good as the company has forecast.
Walgreen - UBS has upgraded the drugstore operator's shares to "buy" from "neutral," saying recent weakness provides a good entry point to take advantage of "big picture" positive developments over the next one or two years.
(Read More: See the Day's Top Percentage Winners & Losers)
Coach - Citi has upgraded the luxury goods maker to "buy" from "neutral," saying the stock has transitioned from a growth stock to a value stock and that any caution is appropriately priced into the shares.
Express - The apparel retailer reported quarterly profit of $0.75 per share, one cent above estimates, with revenue also beating consensus. Less expensive merchandise and promotions helped boost the company's results. However, the company's full-year forecast of $1.40 to $1.54 per share fell well short of consensus estimates of $1.72 a share.
Herbalife - Investor Carl Icahn has added 322,000 shares to the 16 million he already holds. The National Consumers League has called on the Federal Trade Commission to investigate allegations by Pershing Square that Herbalife is a pyramid scheme.
BHP Billiton - BHP is being investigated in both the U.S. and Australia for potential violations of anti-corruption laws, in connection with its 2008 Beijing Olympics sponsorship. The mining company said it believes it was in compliance with the law and that it is cooperating fully with the investigation.
Apple - Apple was outspent in mobile phone advertising last year by rival Samsung, according to new figures from Kantar Media. That's a reversal from 2011, when Apple outspent Samsung by a greater than three-to-one margin.
Discover Financial Services - Discover will offer home-equity loans starting later this year. The credit card issuer will make loans to homeowners for amounts between $25,000 and $100,000.
Dole Food - Dole reported a fourth-quarter loss, as well as revenue that was well below Street expectations. The fruit and vegetable producer was hurt by weaker fresh fruit sales, as well as costs related to a divestiture deal.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Peter Schacknow
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