Shares of YRC Worldwide ( YRCW) were among the Nasdaq's losers Thursday, plunging 15% after the trucking company slashed its first-quarter earnings guidance. The company, which was previously known as Yellow Roadway, now sees earnings of 65 cents to 70 cents a share, down from an earlier view of $1.00 to $1.05 a share. Analysts project earnings of $1.05 a share. "Although our business levels remain ahead of last year, overall volumes for the quarter are projected to come in below our expectations across all of our asset-based business units," the company said. "In addition to general competitive pressure, some of our large retail customers have made significant inventory adjustments in the quarter, which have impacted our business levels." The company said that cost overruns in several areas of its Yellow Transportation business are hurting results as well. YRC said it plans to update 2006 earnings guidance when it posts first-quarter results in late April. Shares were down $6.43 to $38.86. Meanwhile, shares of fellow trucking companies fell in response. J.B. Hunt ( JBHT) shares declined 5%, while Swift Transportation ( SWFT) sank 6%. CNF ( CNF) issued a statement reiterating its first-quarter guidance of 71 cents to 77 cents a share, but shares of the freight transportation company recently were down 67 cents, or 1.3%, to $50.85. Shares of Scholastic ( SCHL) slid 7% after the children's book publisher posted weak third-quarter results and slashed its full-year guidance. The company reported a third-quarter loss of $15.5 million, or 37 cents a share, on revenue of $487.7 million. Analysts surveyed by Thomson First Call expected a much smaller loss of 7 cents a share and revenue of $502.8 million. During the year-earlier period, the company recorded a loss of $800,000, or 2 cents a share, on revenue of $480.8 million. "Our third quarter was disappointing, and based on our review of these results and their impact on the fourth quarter, we are reducing our outlook for the fiscal year," the company said.