Stock futures extended losses on Friday following a disappointing April jobs number and downward revisions to February and March's job additions. 

S&P 500 futures were down 0.6%, Dow Jones Industrial Average futures fell 0.5%, and Nasdaq futures slid 0.62%.

The U.S. economy added 160,000 jobs to nonfarm payrolls in April, below an expected 200,000 increase. The unemployment rate held at 5%, while average hourly wages rose 0.3%. Hourly wages have risen 2.5% in the past 12 months. 

Job gains in March were cut to 208,000 from 215,000, while February's increase was reduced to 233,000 from 245,000. 

The labor report has added significance as it will play an influential role in the FederalReserve's decision-making process regarding the timeline of planned interest rate hikes. The Fed recently left its federal funds rate unchanged following its April meeting and will meet again on June 14-15.

"The headline number was definitely disappointing, and all but erases any chance of a rate hike in June," said Chris Gaffney, president of World Markets at EverBank. "Without any real wage pressure and the uncertainty of a presidential election in the fall I think the FOMC will be forced to sit on their hands until the end of the year. This confirms we will have lower rates for longer -- more of the same."

Crude oil prices were in retreat after a rally on Thursday helped to push the commodity above $44 a barrel. Supply disruptions caused by a massive wildfire in Alberta, Canada, that impeded production and faction in-fighting in Libya that blocked oil tankers provided short-term relief from the current supply glut. West Texas Intermediate crude oil was down 1.5% to $43.65 a barrel on Friday. 

Cigna (CI) - Get Report fell 2% as growth in quarterly premiums and fees revenue helped to boost earnings. The health insurer said its March quarter adjusted earnings increased to $2.32 a share from $1.96 a share. The company also increased full-year earnings estimates to $8.95 to $9.35 a share, up from a previous forecast of $8.85 to $9.25. 

DreamWorks (DWA) swung to suprise profit in its recent quarter, generating per-share earnings of 16 cents compared to a net loss of 64 cents in the year-ago quarter. Revenue jumped 14% to $190.4 million. NBCUniversal, a division of Comcast (CMCSA) - Get Report , has agreed to purchase DreamWorks. 

Square (SQ) - Get Report  slumped 23% after reporting a quarterly net loss of 29 cents a share, far steeper than an expected loss of 6 cents. Revenue inched just 1% higher to $374 million, though came in above consensus of $345 million. 

Yelp (YELP) - Get Report surged 12% in premarket trading after topping quarterly estimates on its top- and bottom-line. The online reviews site earned an adjusted 8 cents a share in its first quarter, more than double expectations, while revenue of $158.6 million beat consensus of $155.6 million. 

GoPro (GPRO) - Get Report  fell 8% despite reporting a narrower-than-expected quarterly net loss and issuing strong full-year sales guidance. The action camera maker expects fiscal 2016 revenue between $1.35 billion and $1.5 billion. Analysts had expected sales at the low-end of that range.