NEW YORK (TheStreet) -- Stock futures were marginally higher on Friday as a series of positive earnings reports from Amazon (AMZN) to Starbucks (SBUX) propped up markets. 

S&P 500 futures were up 0.05%, Nasdaq futures gained 0.11%, and Dow Jones Industrial Average futures rose 0.04%. 

Amazon blew past quarterly estimates, earning 19 cents a share while analysts expected a loss of 14 cents. Sales climbed nearly 20% to $23.18 billion, ahead of estimates of $22.39 billion. The better-than-expected quarter was tied to strong sales in North America and growth in Prime subscriptions. Shares surged more than 21% in premarket trading. 

Starbucks earned 42 cents a share, a penny above estimates, while revenue climbed nearly 18% to $4.88 billion. Global traffic increased 7% compared to expectations of 6.2%. The stock rose more than 4%. 

Visa (V) spiked 6.6% after beating analysts' estimates on the top- and bottom-lines. The credit card company earned 74 cents a share, beating expectations by 15 cents, while sales surged 11.4% to $3.52 billion. Payments volume increased 11% on a constant-dollar basis. 

Xerox (XRX) shares were on watch after the printing company reported a mixed quarter. Earnings of 22 cents a share were in-line with expectations, while sales of $4.59 billion fell 7.1% from a year earlier and missed by $50 million.

American Airlines (AAL) reported record profit in its second quarter. Adjusted net income of $2.62 a share beat estimates by 2 cents. Total revenue passenger miles climbed 1.1% over the quarter. 

Biogen (BIIB) sank 11.9% before the bell after lowering full-year guidance. The biopharmaceutical company anticipates 2015 revenue growth between 6% and 8%, down from previous growth estimates of 14% to 16%.

Anthem (ANTM) and Cigna (CI) announced a merger deal Friday after a month of reports. Indianapolis-based Anthem will acquire health insurance company Cigna for $54.2 billion, a deal that values Cigna shares at $188 a share. Cigna shares added 0.4% before the bell. 

AT&T (T) has received final regulatory approval for its $48.5 billion acquisition of DirecTV (DTV), according to Reuters. The Federal Communications Commission likely will announce the results of their vote on Friday. AT&T and DirecTV shares were up more than 2% in premarket trading. 

U.S. insurance company StanCorp Financial Group (SFG) shot nearly 50% higher in premarket trading on news Japanese firm Meiji Yasuda Life Insurance would acquire it for 600 billion yen ($4.8 billion).