Check out which companies are making headlines after the bell Wednesday:
IBM - The computer hardware and software maker posted earnings of $3.99 a share, excluding one-time items, on revenue of $23.72 billion. Analysts expected the company to post earnings of $3.96 a share on sales of $24.75 billion. In addition, the company said it sees full-year earnings of at least $16.90 a share, slightly above estimates for $16.89 a share. Shares declined in extended-hours trading.
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Ebay - The online auction company posted earnings of 64 cents a share, ex-items, on sales of $3.89 billion, versus projections for 63 cents a share on sales of $3.91 billion. In addition, the company handed in current-quarter guidance that missed Wall Street estimates, sending shares lower in extended-hours trading.
American Express - The credit card provider posted earnings of $1.25 a share on revenue of $8.30 billion, exceeding Wall Street expectations for $1.22 a share on sales of $8.19 billion. Shares ticked higher in extended-hours trading.
Select Comfort - The mattress company posted earnings of 36 cents a share on revenue of $264 million, fall short of expectations for 43 cents a share on sales of $277 million. In addition, the company handed in current-quarter guidance that disappointed current Wall Street projections. Shares tumbled sharply after being temporarily halted in extended-hours trading.
Other mattress makers including Mattress Firm and Tempur Sealy also dropped.
Sandisk - The computer storage and software company posted earnings of $1.59 a share, ex-items, on sales of $1.63 billion, easily beating estimates for $1.32 a share on revenue of $1.57 billion. Shares climbed in extended-hours trading.
Xilinx - The tech company posted earnings of 58 cents a share, ex-items, on sales of $599 million, beating estimates for 52 cents a share on sales of $588 million. Shares fell in extended-hours trading.
SLM (Sallie Mae) - The student loan provider posted earnings of 60 cents a share, edging past estimates by a penny a share. In addition, the company handed in full-year earnings guidance that topped current Wall Street expectations. Shares rallied in extended-hours trading.
USG - The building products manufacturer said it expects to post third-quarter earnings of approximately 21 cents a share on sales of $925 million, below current expectations for 28 cents a share on revenue of $939 million. The company is slated to post results on Oct. 24. Shares tumbled in extended-hours trading.
—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)
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