Biggest small-cap gainers and losers in Tuesday's trading

Here are Tuesday’s biggest percentage gainers and losers, along with top volume leaders, among companies with a market cap between $50 million and $750 million:

Biggest percentage gainers:

• R.H. Donnelley Corp. (NYSE:RHD), up 22.4% to $5.95 after the Cary, N.C.-based Yellow Pages publisher after competitor Idearc posted first-quarter earnings above Wall Street expectations. R.H. Donnelley releases earnings on May 8.
• Ambassadors International, Inc. (Nasdaq:AMIE), up 28.3% to $7.03 after the Newport Beach, Calif.-based travel company reported late Monday that its first-quarter revenue rose to $56.8 million from $32.9 million a year earlier. Wall Street analysts anticipated $53.4 million.
• VanceInfo Technologies Inc. (NYSE:VIT), up 23.8% to $11.14 despite no significant news.

Biggest percentage losers:

• Obagi Medical Products, Inc. (Nasdaq:OMPI), down 20% to $7.03 after the Long Beach, Calif.-based skin care products maker missed first-quarter earnings expectations by $0.05 per share.
• Atlantic Tele-Network, Inc. (Nasdaq:ATNI), down 16.8% to $27.55 after the Salem, Mass.-based provider of telecommunications services in the Caribbean and North America reported first-quarter revenue of $45.6 million, which missed analysts’ expectation of $47.1 million. Quarterly profit came in at $7.9 million, or $0.51 per share, versus Wall Street’s anticipation of $0.56 per share.
• Stereotaxis, Inc. (Nasdaq:STXS), down 16.3% to $5.55 after the medical devices maker posted first-quarter revenue of $7 million, down 23% from $9.2 million a year earlier. Analysts anticipated $8 million in revenue. The St. Louis-based company’s quarterly net loss widened to $0.37 per share, versus Wall Street analysts’ estimate of losing $0.33 per share.

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