Check out which companies are making headlines after the bell Tuesday:
Mattress Firm - The mattress maker posted earnings of 31 cents a share, excluding one-time items, on sales of $334 million, missing expectations for 36 cents a share on revenue of $337 million. But the company raised its full-year sales guidance. Shares edged higher in extended-hours trading.
Tibco - The computer software company posted preliminary second-quarter earnings of between 12 cents a share and 13 cents a share, excluding one-time items, on sales of $250 million to $252 million, missing estimates for 21 cents a share on revenue of $267 million. Shares tumbled sharply after being temporarily halted in extended-hours trading. Rival software companies such as SAP and Progress Software traded lower.
Ascena Retail - The specialty retailer for women's apparel posted earnings of 27 cents a share, excluding one-time items, on sales of $1.15 billion. Analysts expected the company to post earnings of 19 cents a share on revenue of $1.17 billion. The company's CEO David Jaffe said third-quarter sales were "challenging" and that the trend "continued into the start of the fourth quarter." Shares were lower in extended-hours trading.
Gartner - The company announced that its chief financial officer, Chris Lafond, will be leaving at the end of the month and will be succeeded by Craig Safian, currently vice president of global finance. Shares were unchanged in extended-hours trading.
—By CNBC's JeeYeon Park