Check out which companies are making headlines before the bell:
Salesforce.com–Salesforce was told by a "large technology company" that it had infringed some of that company's patents, according to an SEC filing. The software company said it is in the process of analyzing the claim, and that no litigation has been filed to date.
AstraZeneca–The company's key experimental psoriasis drug was linked to suicide fears. The drug maker had been sharing development of the drug with Amgen, but Amgen has dropped out following this development.
General Motors–GM was approached by Chrysler CEO Sergio Marchionne about a possible merger in March, according to the New York Times, but GM CEO Mary Barra was not interested in such a deal. Separately, GM is close to facing criminal charges over its ignition switch issues, according to The Wall Street Journal.
Dollar General–The discount retailer's stock was added to the "conviction buy" list at Goldman Sachs, pointing to tailwinds from low-income consumers as well as competitive advantages.
L Brands–Goldman Sachs added the Victoria's Secret parent to its "conviction buy" list, calling it one of the highest quality growth companies in consumer retailing.
Wal-Mart–Wal-Mart auditor Ernst & Young allegedly knew of bribery allegations against the retailer in Mexico long before Wal-Mart disclosed that news. That accusation comes from pension fund advisor CtW Investment Group.
Amazon.com–Amazon has changed its European tax practices amid regulatory probes by EU officials, according to the Wall Street Journal.
Expedia–JMP Securities upgraded the travel website operator's stock to "market outperform" from "market perform," saying Expedia is gaining market share and executing at a high level.
Party City–Morgan Stanley began coverage of the party supplies retailer with an "overweight" rating, calling the company a "category killer" with multiple avenues for earnings growth.
EBay–Axiom Capital upgraded eBay to "buy" from "hold" ahead of its PayPal spin-off, saying PayPal is weathering competitive concerns better than expected and that eBay's growth rate challenges are easing.
Qualcomm–The chip maker has struck a mobile technology partnership with automaker Daimler, involving the recharging of mobile devices as well as electric cars.
Apple–Apple named senior vice president of design Jony Ive to the newly created position of Chief Design Officer.
BlackBerry–BlackBerry will lay off an unknown number of workers in its device business, according to Re/Code.
Twitter–Twitter has held talks to acquire news app Flipboard in a stock deal that would value the news app at more than $1 billion, according to Re/Code.
Arch Coal–Arch is in talks with advisors about reducing its debt, according to the Wall Street Journal. But the paper also said the company is not considering a bankruptcy filing.