Take a look at some of Wednesday's after-hours buzz:
Martha Stewart Omnimedia surged more than 25 percent in extended-hours trade on news that the media entity has with marketing firm Meredith, which will take over ad sales, circulation and production of Martha Stewart Living and Martha Stewart Weddings magazines. Shares of Meredith were unchanged in after-hours trade.
Wal-Mart fell 0.7 percent in extended-hours trade after the world's largest retailer .
Netflix slid nearly 26 percent in after-hours trade after the video-streaming service reported subscriber growth figures were lower than expected, despite posting earnings in line with estimates.
Las Vegas Sands gained nearly 2 percent in after-hours trade as the casino operator posted third-quarter earnings that matched expectations.
Hit by Netflix and market losses, the Nasdaq 100 ETF, the PowerShares QQQ Trust, lost nearly 1 percent in extended-hours trading.
The S&P 500 ETF, SPY, also declined more than 0.7 percent in after-hours trade.
Wires contributed to this report.