The Dallas -based healthcare services firm's earnings and revenue beat Wall Street expectations.
Tenet Healthcare Corp reported a bigger quarterly loss as the hospital operator took one-time charges, partly due to changes in the U.S. tax law.
Meanwhile, fourth quarter sales were higher than expected and guidance for the upcoming year was strong.
It came after the much talked about wearable tech firm reported losses per share of 2 cents and revenues that missed expectations by US$18mln.
The firm's fourth-quarter results also missed estimates due to an about 17% fall in the sale of its fitness trackers in the holiday quarter.
Meanwhile, in a similar vein, shares of NutriSystem Inc (NASDAQ:NTRI) the weight loss group, tanked over 27% to US$ 28.95 in New York after it announced earnings per share and revenues that beat analyst expectations, but weak guidance sent the stock plummeting.
Elsewhere, in extended hours, Akorn Inc (NASDAQ:AKRX) shares tanked over 35% to US$19.50 as the Illinois based generic pharma group is under investigation by acquirer Fresenius regarding alleged breaches of FDA data integrity requirements relating to product development.
Palo Alto Networks Inc (NYSE:PANW), the network security firm, added 6.3% after the bell to US$ 179.98 after it posted growth in revenue as well as EPS (earnings per share) and revenues that surpassed expectations.