Shares of Compuware ( CPWR) were among technology's losers Tuesday, falling 11% after the software company warned that second-quarter results would fall short of expectations. The company expects 6 cents a share in earnings on sales of $288 million. Analysts polled by Thomson First Call had been expecting earnings of 7 cents a share on sales of $311.1 million. "The second quarter proved to be a challenging one in regard to closing deals," the company said. Despite the second-quarter shortfall, the company backed its full-year guidance. Compuware expects to release its second-quarter results on Oct. 27. Shares were trading down 88 cents to $7.38. SigmaTel ( SGTL) fell 14% after the company slashed its third-quarter earnings and gross margin forecast and said sales would be at the low end of its previous guidance and below Wall Street forecasts. The chipmaker said earnings would be 10 cents below the low end of its previous pro forma earnings guidance of 30 cents to 37 cents a share. Previous guidance included about 3 cents in projected litigation costs. Gross margin will come in at about 51%. Previously, the company said that gross margin would be 54%, plus or minus a couple of percentage points. SigmaTel expects sales of $74.4 million, which is at the low end of its guidance of $73 million to $82 million. The company blamed its results on equipment issues at its test and assembly facilities. Analysts had been expecting earnings of 30 cents a share on sales of $78.6 million. Shares were trading down $2.34 to $14.87. Shares of Phoenix Technologies ( PTEC) fell 14% after the company previewed fourth-quarter sales that were below expectations. When the software company posts earnings on Nov. 3, it expects to report sales of about $23 million, which is below its previous guidance of $27 million to $28 million. The company expects to be profitable on a pretax basis and expects to be cash flow positive as well. "We are disappointed that our revenues did not meet our expectations," the company said. "In our BIOS business - Core System Software for PCs and servers - ASPs declined somewhat this quarter as we continued to focus on obtaining market share." Analysts are expecting earnings of 11 cents a share on sales of $27.6 million during the fourth quarter. Shares were trading down 98 cents to $6.06.