Check out the companies making headlines after the bell Thursday:
Wynn Resorts edged lower after hours after JPMorgan analysts downgraded the high-end hotel and casino operator to neutral from overweight. Its price target for the stock was lowered to $94 from $101.
Shares of Harsco edged up in extending trading after the steel production firm gave a positive second-quarter pre-announcement and raised its fiscal year 2016 guidance. Harsco said it expects an adjusted operating income of $41 million for the second quarter, up from its previous guidance range of $22 million to $27 million.
Ultragenyx showed gains of roughly 3 percent after meeting its primary Phase 3 study goals for a rare genetic disorder. The pharmaceutical company defined the "investigational therapy" as the most advanced in the company's pipeline.
Cypress Semiconductor made slight gains after hours as the bidding for a takeover of the company continues. According to a report from The Street, the company is working with Goldman Sachs to explore strategic options. Cypress Semiconductor has already received one bidder's offer of $14 per share.
-CNBC's Celena Chong and Michael Bloom contributed to this report.