Check out which companies are making headlines after the bell Tuesday:
Pandora - The online radio company posted earnings of 5 cents a share on revenue of $120 million, beating expectations for a penny a share on revenue of $117 million. However, the company handed in disappointing current-quarter earnings and revenue guidance, sending shares sharply lower in extended-hours trading.
(Read More: Stocks End Lower Amid 'Cliff' Fears; NFLX Soars)
Mattress Firm - The mattress chain posted earnings of 47 cents a share on revenue of $277 million, edging past expectations by a penny a share on sales of $272 million. But the firm handed in weak current-quarter and full-year earnings and revenue outlook. Shares plunged in extended-hours trading.
Altera - The chipmaker said it expects fourth-quarter revenue to be between lower by 8 percent to 10 percent compared to third-quarter levels. For next year, Altera said it expects gross margin to be between 69 percent and 70 percent. Shares declined in extended-hours trading.
Netflix - The online movie-streaming company continued to edge higher in extended-hours trading. The company surged nearly 14 percent in the regular trading session after Walt Disney agreed to give the firm exclusive TV distribution rights to its movies.
Intrepid Potash - The the company declared a special dividend of 75 cents a share, sending shares higher in extended-hours trading.
Staples - The office supply retailer announced a fourth-quarter dividend of 11 cents a share.
Bristol-Myers - The pharmaceutical company increased its quarterly dividend by a penny to 35 cents a share. Shares edged higher in extended-hours trading.
Tibco Software - The computer software company handed in a fourth-quarter earnings and revenue outlook that missed Wall Street projections, sending shares sharply lower in extended-hours trading.
AeroVironment - The tech company posted earnings of 39 cents a share on revenue of $80 million, blowing past estimates for 22 cents a share on sales of $77 million. Shares jumped in extended-hours trading.
Powell Industries - The electronics company posted earnings of 99 cents a share on revenue of $184 million, 65 cents a share on sales of $187 million. Meanwhile, the company handed in full-year 2013 revenue guidance that was below expectations, while earnings outlook was in the lower-range of forecasts.
(Read More: CNBC's Market Insider Blog )
—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)
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