Check out which companies are making headlines before the bell:
Baidu — The Chinese internet search provider was under pressure after slashing revenue projections for its fiscal second quarter. The firm now sees second-quarter sales to come in between $2.81 billion and $2.82 billion, compared to a previous guidance of between $3.12 billion and $3.19 billion.
Microsoft — The tech giant unveiled a new Xbox console that will support virtual reality and ultra-high resolution at E3, a video game conference. "Project Scorpio" will be available in 2017, Microsoft said.
Zimmer Biomet —The medical device maker said its secondary offering of 11.1 million shares priced in at $115.85. The stock was down about 2.4 percent in premarket trading.
Staples — Staples launched a same-day delivery service in eight major cities, including New York, Boston, and Dallas. The office supplies retailer said orders placed by 3 p.m. local time would be delivered by 7 p.m., "initially for a fee of $14.99 per delivery."
Viacom — Manuela Herzer, Chairman Sumner Redstone's ex-girlfriend, asked for a new trial in Redstone's competency case, according to the Los Angeles Times. Herzer's last trial against Redstone was dismissed after a judge determined Redstone was competent.
Nissan — The Japanese automaker said it was developing fuel cell vehicle technology using ethanol as a hydrogen source in what would be an industry first.
Alibaba — Alibaba said it expects to nearly double its volume transaction by 2020, adding that is sees revenue rising by about 50 percent by fiscal year 2017.
GlaxoSmithKline — The drugmaker's chairman of vaccines, Moncef Slaoui, will be retiring by June 2017.