R.H. Donnelley Corp. (NYSE:RHD) shares are leading small-cap percentage gainers in Tuesday’s session after the Yellow Pages publisher’s competitor Idearc (NYSE: IAR) posted higher first-quarter profit. R.H. Donnelley’s rapid rally caused short sellers to cover their positions, which further boosted the stock price. About 21.1 million R.H. Donnelley shares, or 31% of shares, were being sold short as of April 10.

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