Small-cap stocks traded higher for most of the day before taking a hard fall along with the major indices, and Virgin Mobile USA ( VM) was among the winners after its initial public offering . The prepaid-wireless outfit priced 27.5 million shares at $15 a pop, mostly from the company itself, for trade on the New York Stock Exchange. Underwriters have a 30-day option for about another 4.1 million shares to cover overallotments. Shares of the Warren, N.J., company were recently up 3.7% to $15.55. Newpark Resources ( NR), Texas-based purveyor of services to the oil and gas industry, jumped 10.6% to $6.26 after agreeing to sell its U.S. Environmental Services business for $81.5 million in cash to Trinity TLM Acquisitions. The deal, which will probably close by year-end, also includes a five-year earn-out provision potentially worth up to $8 million. Agfeed Industries ( FEED), a China-based animal-feed company, leapt 7.2% to $12.85 after Nasdaq approved it for listing on its Global Market index. The change will effect at open of business on Friday. Among the losers, however, was Ruby Tuesday ( RT). Shares of the restaurant chain sank 14.4% after it pocketed just $11.1 million, or 21 cents a share, in the fiscal first quarter. That's nearly half of year-ago earnings, and it comes in a penny shy of Thomson Financial's per-share analyst expectations.