Wall Street digests earnings, PMIs eyed

U.S. stock index futures indicated a slightly lower open Friday, amid weak global sentiment, as investors digested more earnings news and awaited fresh manufacturing data.

Dow components Caterpillar, McDonald's and General Electric reported before the bell. Traders will also be digesting earnings from Google parent Alphabet from Thursday evening. Shares of the tech firm fell in after-hours trade after the company reported earnings and revenue that fell short of analyst expectations.

Alphabet said it saw adjusted first-quarter earnings of $7.50 per share on $20.26 billion in revenue. Analysts expected Alphabet to report earnings of about $7.97 a share on $20.37 billion in revenue, according to a consensus estimate from Thomson Reuters.

American Airlines Group, AutoNation, Kimberly-Clark, SunTrust and Synchrony Financial are also among those reporting.

On the data front, manufacturing PMIs (purchasing managers' index) will be released at 9:45 a.m. Traders will also eye the oil price which has weighed on sentiment in recent months. Oil markets saw a pickup in prices on Friday morning. Brent and U.S. crude posted modest gains in early European trade, hovering around $45 and $43.50 respectively.

European stocks posted losses in early Friday trade, as sharp losses in autos and mining stocks capped gains in the region. Volkswagen shares were lower by 4.5 percent. Reuters, citing sources, reported it was hiking its provisions to pay for the emissions scandal to 16-17 billion euros from a previous 6.7 billion euros. Meanwhile, Asia markets finished mixed on the final trading day of the week.

—CNBC's Alex Gibbs and Evelyn Cheng contributed to this article.

Correction: This story has been updated to reflect that all earnings were due before Friday's opening bell.