The company's ability to sell ads on mobile devices is a key concern because royalty costs rise every time a listener plays a song. Those concerns grew last week, when the company said it would cap free listening on mobile devices at 40 hours per month, suggesting it was having trouble with rising costs.
The company said that its total listener hours climbed 53 percent to 4.05 billion hours compared to the same period a year before. That same measure increased by 42 percent for February to 1.38 billion.
Pandora also forecast an adjusted first-quarter loss of 10 to 13 cents per share. It expects revenue of $120 million to $125 million for the period. Analysts had forecast a loss of 10 cents per share on revenue of $119 million.
The company said full year adjusted earnings could range from a loss of 5 cents per share to a gain of 5 cents per share. It expects revenue of $600 million to $620 million. Analysts forecast a loss of a penny per share on revenue of $602 million.