Check out the companies making headlines after the bell Monday:
Shares of Wayfair slipped after short seller again Whitney Tilson again knocked the online home furnishing retailer, calling it his biggest short position and predicted the stock will trade below $10 within a year. Wilson is the second short seller after Andrew Left's Citron Research to predict it will fall below $10. The call on the stock overshadowed the company's better-than-expected third-quarter revenue.
Pandora inched up after it announced an agreement to acquire several key assets from music streaming company, Rdio. The music discovery platform said the deal will "accelerate the company's plan to offer fans greater control over the music they love, strengthening Pandora's position as the definitive source of music."
Shares of Urban Outfitters fell after the company reported disappointing quarterly results. The apparel retailer said comparable sales rose far less than expected in the third quarter thanks to weaker demand for its Anthropologie brand.
Tech company Nuance Communications popped after delivering earnings and revenue that beat Wall Street forecasts. "We expect to continue our improvements in financial performance and lead the company to improved growth in 2016 and beyond," CFO Dan Tempesta said, in a statement.
Shares of American International Group inched lower on news that it has adopted proxy access. The company said it has amended its bylaws to allow eligible shareholder to include their own director nominees in AIG`s proxy statement for its annual meeting. "The board proactively adopted these amendments, reflecting its strong commitment to corporate governance best practices," the insurer said, in a statement.
Valeant got a small boost after Stephen Mandel's Lone Pine added 2.15 million shares to its Valeant position, according to a September filling. That brings his total Valeant holdings to 7.5 million shares. Mandel is among the most well-respected retail hedge fund managers.
— Reuters contributed to this report.