Check out the companies making headlines after the bell:
Helios and Matheson Analytics, MoviePass' parent company, stock fell as much as 4 percent during after-hours trading on Wednesday. New York Attorney General Barbara Underwood has opened an investigation into the company for possibly misleading investors about its financials, a source told CNBC.
Constellation Brands stock fell as much as 2.7 percent during after-hours after the company announced that CEO Rob Sands will step down on March 1, 2019. He ran the family-controlled company that brews Corona for 11 years. Bill Newlands, the chief growth officer and president, will become CEO. The company's stock later regained its after-hours losses and traded up as much as 1.25%.
Alcoa's stocks rose more than 5 percent after the market closed as the company beat expectations on their quarterly report. The aluminum maker beat on both its top and bottom lines, reporting earnings of 63 cents a share on $3.39 billion in revenue. Analysts had expected earnings of 36 cents per share on $3.31 billion in revenue.
Sealed Air stock fell more than 6 percent after-hours after the packaging company lowered its 2018 earnings guidance. It now expects earnings of $2.40-$2.45 per share, down from $2.45-$2.55 per share.