By midafternoon, shares had exploded 25.4% to $8.12.
Trading volume of 1 million was nearly six times its three-month daily average.
The social and mobile marketing provider reported operating revenue of $429 million in the three months to December compared to $299 million in the year-ago quarter.
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However, Dallas-based Dex Media realized a net loss of $556 million over the quarter, wider than $37 million a year ago.
In May last year, Dex One and SuperMedia merged to form Dex Media as they emerged from bankruptcy.
"The merger of Dex One and SuperMedia created a new company with substantial scale and market presence to achieve expense synergies and drive new client growth opportunities," said CEO Peter McDonald in a statement. "In 2014, we look forward to finalizing our integration and continuing the rollout of our go-to-market approach."