Check out which companies are making headlines after the bell Monday:
Herbalife rose nearly 4 percent in extended-hours trading after Fox Business Network reporter Charles Gasparino said that activist investor Carl Icahn had not sold his stake or his option position, contrary to rumors from Barron's report that came just before the closing bell.
Auto parts retailer Autozone edged lower in extended-hours trading after the firm reported weaker-than-expected quarterly revenue as a strengthening U.S. economy encouraged new vehicle purchases rather than repair existing ones.
Yahoo continued to fall in extended-hours trading after earlier losing more than 5 percent on downgrades by Bank of America Merrill Lynch and Bernstein. Alibaba declined more than Yahoo in after-hours trading.
Shutterfly gained in after-hours trading on news that private equity firm Silver Lake was in advanced talks to acquire the photo-sharing company.
Dresser-Rand fell slightly in extended-hours trading after Germany's Siemens agreed to buy the U.S. oilfield equipment maker for $7.6 billion in cash, a relatively high price in an effort to increase its presence in the U.S. shale oil and gas industry.
Apple edged lower in extended-hours trading on rumors that the firm might discontinue Beats music streaming, after gaining during the day on record iPhone sales of more than 10 million units in the first three days of the new models' launch.