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Traders work on the floor of the New York Stock Exchange.

Check out which companies are making headlines ahead of the bell Friday:

BlackBerry—The smartphone maker reported a much smaller-than-expected quarterly loss even as its sales continued to decline. Shares rallied in pre-open trading.

Zynga—Billionaire Steven Cohen raised his stake to 5.3 percent from 2.2 percent in the video-game publisher, according to a regulatory filing. Shares gained in pre-open trading.

Wal-Mart—The retail giant filed a $5 billion lawsuit against Visa earlier this week, saying the credit card company passed along unreasonable fees when shoppers used credit or debit cards at its stores, according to a Wall Street Journal report.

Restoration Hardware Holdings—The upscale retailer projected first-quarter profit that beat estimates. Shares climbed in pre-open trading.

Netflix—Shares of the provider of online shows and films dropped after the Wall Street Journal reported Amazon.com could begin advertising-backed streaming services. Early Friday, the online retailer denied it had any such plans.

Exact Sciences—Shares gained after the company confirmed a regulatory panel had recommended approving its cancer-screening test.

—By CNBC's Kate Gibson.

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