NEW YORK (TheStreet) -- Stock futures headed lower on Wednesday morning after Apple (AAPL) and Microsoft (MSFT) issued disappointing sales forecasts. 

S&P 500 futures were down 0.52%, Dow Jones Industrial Average futures fell 0.43%, and Nasdaq futures declined 1.4%. 

Apple shares tumbled nearly 7% in premarket trading after revenue projections for the iPhone maker's fiscal fourth quarter fell shy of estimates. The tech giant guided for fourth-quarter sales of $49 billion to $51 billion, below estimates of $51.1 billion. Third-quarter iPhone sales also came in slightly below estimates, with 47.5 million units moved over the three months. 

Microsoft slid more than 3% as revenue projections came in weaker than expected. The company anticipates fiscal first-quarter revenue as high as $21.3 billion, below consensus of $22.8 billion. Currency exchange is expected to reduce first-quarter and second-quarter revenue by 5%, the software maker said. 

Yahoo! (YHOO) also guided for weaker-than-expected future sales. The Internet company slipped 2.5% after forecasting third-quarter revenue between $1 billion and $1.04 billion, short estimates of $1.07 billion. Yahoo!'s most recent quarter also fell below estimates with net income of 16 cents a share missing by 2 cents. Profit was hurt by higher user acquisition costs. 

GoPro (GPRO) inched 0.6% higher before the bell after reporting quarterly profit of 35 cents a share, 9 cents above estimates. Revenue surged 71.7% on the back of strong sales in Asian markets. GoPro shipped 1.65 million cameras over the quarter, a 93% increase from a year earlier. 

Chipotle (CMG) increased nearly 3% even as same-restaurant sales cooled off from explosive gains in recent quarters. The burrito chain earned $4.45 a share, a penny above estimates, while revenue increased 14.3% to $1.2 billion. Comparable-store sales increased 4.3% in the second quarter compared to 10.4% in the first quarter and 17.3% in the year-ago quarter.

Coca-Cola (KO) shares were on watch after the beverage giant reported net income of 63 cents a share, 3 cents higher than anticipated. Revenue fell 3.3% to $12.16 billion, as currency exchange reduced the top-line by seven percentage points. 

Boeing (BA) shares added 1.8% after beating quarterly profit estimates by a wide margin. The aerospace company earned $1.62 a share, 25 cents above estimates, on revenue 11.3% higher than a year earlier. Full-year guidance was reduced to factor in the impact of necessary fixes to its KC-46 tankers. 

AT&T (T) and DirecTV's (DTV) proposed merger has received official recommendation from Federal Communications Commission Chairman Tom Wheeler. AT&T's $49 billion purchase will come with strings, though, as the combined company will be required to submit interconnection agreements and network performance reports to the agency. 

Medical equipment developer Thoratec (THOR) jumped 10% on news St. Jude Medical  (STJ) will acquire it for $63.50 a share, or a total $3.4 billion. The acquisition represents a 10% premium on Tuesday's closing price.