Check out which companies are making headlines before the bell:
Aetna — The insurance company earned an adjusted $1.90 per share for the third quarter, 13 cents above estimates, though revenue was slightly below forecasts. Aetna did raise its full-year earnings forecast for the fourth time this year, despite a slight drop in medical plan membership.
Time Warner Cable — The cable operator beat estimates by 5 cents with adjusted quarterly profit of $1.62 per share, with revenue essentially in line. The company, which is in the process of being acquired by Charter Communications, also saw its strongest subscriber numbers in several years.
Marathon Petroleum — The oil company slashed its quarterly dividend to 5 cents per share from 21 cents, citing the uncertainty surrounding the long-term fate of commodity prices.
MGM Resorts — MGM announced plans to create a real estate investment trust that will contain ten of the casino operator's properties. Separately, MGM reported adjusted quarterly profit of 12 cents per share, 8 cents above estimates, with revenue also above analysts' forecasts.
Sherwin-Williams — The paint company earned $3.97 per share for its latest quarter, 11 cents above estimates, but revenue was shy of forecasts. However, the company is increasing its full year forecast based on strong sales compared to a year earlier.
McKesson — The drug distributor earned an adjusted $3.31 per share for the third quarter, 32 cents above estimates, with revenue also above forecasts. McKesson also announced plans to buy back $2 billion in stock.
Amgen — The biotech giant reported adjusted quarterly profit of $2.72 per share, beating estimates of $2.38. Revenue also beat forecasts, and Amgen also raised its 2015 outlook as it benefits from a significant increase in sales of rheumatoid arthritis drug Enbrel.
Pfizer — Pfizer is reportedly in talks with Allergan about a possible merger, according to The Wall Street Journal. The paper said Pfizer recently approached Allergan about a deal, although it added that the talks are still in very early stages.
Sony — Sony reported a fiscal second quarter profit, compared to a year earlier loss, thanks to healthy sales of its PlayStation 4 videogame consoles and its image sensors.
GoPro — GoPro missed estimates by 4 cents with adjusted quarterly profit of 25 cents per share, with revenue also missing by a significant margin. The high definition camera maker saw lower than expected sales of its new line of wearable cameras.
PayPal — PayPal came in 2 cents above estimates with adjusted quarterly earnings of 31 cents per share, with revenue and the 2015 yearly earnings outlook in line with forecasts. The payment processing company did see its results hurt by the stronger US dollar, as about half its revenue originates outside the United States.
Buffalo Wild Wings — The company fell 29 cents shy of estimates with quarterly profit of $1.00 per share, with revenue missing as well. It also predicted single digit earnings growth for the full year, compared to a consensus analysts' estimate of 13 percent growth. The restaurant chain points to labor costs among the factors impacting its results.
Marriott — Marriott reported quarterly profit of 78 cents per share, 4 cents above estimates, though the hotel operator's revenue was below forecasts. Marriott also gave conservative earnings guidance for the current quarter.
Yelp — Yelp reported a quarterly loss that was 2 cents wider than expected at 11 cents per share, though revenue did beat forecasts. The online review site spent more on sales and marketing during the quarter in an effort to increase site traffic.
LifeLock — LifeLock beat estimates by 3 cents with adjusted quarterly profit of 28 cents per share, with revenue also above forecasts. The identity theft protection company also announced an agreement with the Federal Trade Commission to settle outstanding litigation.
HanesBrands — HanesBrands reported adjusted quarterly profit of 50 cents per share, 5 cents above estimates, with revenue also above forecasts. The maker of underwear and other apparel also raised its full-year forecast, on benefits from recent acquisitions.
Sanofi — The drug maker said sales of its diabetes drugs would continue to fall until 2018 because of growing competition and patent expirations.