Check out the companies making headlines after the bell on Wednesday:
Western Digital's stock popped in extended trading after the company raised its guidance and announced an executive transition.
The storage technology company, which recently acquired SanDisk, now expects fiscal fourth quarter earnings of 72 cents per share, adjusted, on revenue of $3.46 billion. That's above its prior range of 65 cents per share to 70 cents per share on revenue of $3.35 billion to $3.45 billion.
The company also appointed Mark Long to an executive vice president role, where he will succeed chief financial officer Olivier Leonetti in September. Shares of rivals Seagate Technology and Micron also moved after the news.
Chemours shares bounced after the company said it would appeal a verdict related to a cancer lawsuit. The stock closed down more than 22 percent in the regular trading session after the company was found liable for a man's testicular cancer in a test case involving 3,500 lawsuits.
Natural gas companies Chesapeake Energy, Devon Energy and Southwestern Energy edged higher after hours amid a slew of energy news.
Natural gas rebounded from a one-week low Wednesday, settling up 2.2 cents, or 0.8 percent, Dow Jones reported. It came as oil prices spiked sharply in post-settle trade amid falling stock piles. Meanwhile, a nuclear power reactor north of New York City made headlines for shutting automatically. The company, Entergy, said it is investigating the cause of the shutdown, according to Reuters.
United Continental dipped in light volume after closing more than 2 percent lower in the regular trading session. Given "international macro risk," shares of the airline company were downgraded to "neutral" by Credit Suisse on Wednesday, Dow Jones reported, prompting Barron's to post a bearish take on airlines.
— CNBC's Fred Imbert contributed to this report.