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Trader on the floor of the NYSE

Check out which companies are making headlines before the bell:

Herbalife—CNBC's Scott Wapner reports federal law enforcement agencies recently contacted several Herbalife members for information about their own business practices, although the specific nature of the inquiry is unclear.

Tesla—The automaker delivered 10,030 vehicles during the first quarter, its highest quarterly total ever and a 55-percent increase over the first quarter of 2014.

Ventas—The real estate investment trust will buy privately held hospital operator Ardent Health Services for $1.75 billion in cash.

Qualcomm—A teardown of the new Samsung Galaxy S6 smartphone by the tech website chipworks.com shows that the phone does not contain the expected Qualcomm LTE modem. It had been previously revealed that the S6 also did not contain a Qualcomm processor that had been in previous Galaxy models.

Microsoft—Microsoft was upgraded to "outperform" from "market perform" at Wells Fargo, which said negative headwinds such as currency and potential earnings estimate reductions are already adequately reflected in the stock's price.

Lorillard, Reynolds American—The two tobacco companies are on watch today, on a shift in sentiment about whether a proposed merger between the tobacco giants will be allowed to proceed. The stocks had fallen in recent weeks on sentiment that it would be rejected, but reports emerged late last week that the FTC was leaning towards a proposed compromise that would allow it to go through.

IBM—IBM has hired advisers to help it deal with possible attacks from activist investors, according to Reuters. This comes after top shareholders reportedly sought help from such investors after 11 straight quarters of declining revenue.

Zillow—Barclays downgraded the real estate website operator's stock to "equal weight" from "overweight," saying it is still bullish long-term on Zillow but that the company faces short-term traffic growth difficulties.

TrueCar—The car buying service added 840 new dealers during the first quarter, its best quarterly total ever. That brings its total to an all-time high 10,680.

Garmin—Citi downgraded the stock to "sell" from "buy," saying growth will slow in Garmin's GPS fitness watch business. Citi also cut its price target for Garmin to $42 from $68 per share.

Regions Financial, Comerica—Guggenheim cut its rating on the two regional banks to "neutral" from "buy," in part because of greater risk tied to exposure to energy-related companies.

Toyota—Toyota has ended a plant expansion freeze, with the automaker reportedly planning to spend $1.3 billion to build two new plants in Mexico and China.

Actavis—The drug maker filed an FDA application for a generic version of Letairis, a hypertension treatment made by Gilead Sciences. Actavis also said Gilead had sued it to prevent it from bringing the generic version to market prior to the expiration of its patent.

Apple—The Apple Watch will see its debut in Switzerland delayed until the end of the year because of a patent issue, according to Swiss TV broadcaster RTS. At issue is the image of an apple and the use of the word "Apple" because of a 1985 patent that expires on December 5.

Google—An antitrust lawsuit brought by consumers has been withdrawn, after a judge had dismissed it in February and told the plaintiffs to amend their claims. The suit claimed Google had forced Android handset makers to use Google applications as the default option, and that this had resulted in higher handset prices.

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