Check out the companies making headlines after the bell Wednesday:
Cisco Systems shares jumped 4 percent as the IT networking provider posted fiscal fourth-quarter earnings and revenue that topped analysts' estimates. The company's adjusted profits rose 7 percent to 59 cents a share, while revenue increased about 4 percent to $12.8 billion. Wall Street expected earnings of 56 cents a share on $12.65 billion in sales. It also handed in first-quarter earnings and revenue projections that were in line with expectations.
Renewable energy developer SunEdison announced a joint venture with Dominion to develop a new solar project in Utah. SunEdison shares gained about 5 percent after the announcement.
News Corp's Class A shares popped 4 percent after the media services company reported better-than-expected earnings of 7 cents a share, beating estimates by 2 cents. Revenue of $2.14 billion trailed forecasts.
Oneok's stock dipped about 2 percent after the natural-gas processor announced a $500 million offering of senior notes. The company said it would use the proceeds, as well as its cash on hand, to buy additional shares of its limited partnership Oneok Partners, which saw its shares fall about 3 percent after the bell.
Shares of media and entertainment conglomerate Comcast inched lower before turning flat after its NBCUniversal subsidiary announced a $200 million equity investment in Vox Media, the digital media firm behind brands like Eater and Racked. NBCUniversal CEO Steve Burke said the company looked forward to building a "partnership involving editorial content, advertising and technology." (Disclosure: Comcast is the owner of NBCUniversal, the parent company of CNBC and CNBC.com.)
Diamondback Energy fell more than 2 percent in extended-hours trading after the oil-and-gas producer launched a public offering of 2 million shares of common stock. It plans to use the proceeds to repay outstanding debt.
Correction: Dominion will invest about $500 million to acquire 50 percent of the cash equity and 99 percent of the tax equity in the project with SunEdison. That was misstated in an earlier version of this article.