Check out the companies making headlines after the bell Monday:
Advanced Micro Devices - The chipmaker's shares plunged more than 13 percent, following a brief halt, after cutting its current-quarter revenue and profit-margin guidance, citing low PC demand.
The company expects sales to fall about 8 percent from the most recent quarter. It had earlier predicted sales could even break even with the previous quarter. AMD also said its adjusted gross margin would come in around 28 percent, versus previous guidance of 32 percent.
Lending Club - Shares of the online lender spiked as much as 7.5 percent shortly before the closing bell on rumors JPMorgan might have an interest in the company.
The chatter appears to be an exaggeration of an TheDeal.com report, which quoted an unnamed industry consultant, speculating that it would make sense if a large financial institution targeted LendingClub as a way to get into the online lending business. Lending Club declined to comment on the matter. Shares were down about 3 percent after-hours.
A. Schulman - Shares tumbled about 6 percent after the plastic compounds supplier said third-quarter revenue declined about 13 percent from a year ago. The company reported a net loss of 34 cents a share, down from 66 cents a share a year ago.
TerraForm also raised its 2016 dividend target by 26 percent to $1.53. Shares of TerraForm and SunEdison were both down about 4 percent in after-hours trading.
—CNBC's Alex Crippen contributed to this article.