Printronix ( PTNX) rocketed 26.4% after the Irvine, Calif.-based company lifted its fiscal third-quarter guidance. The printing-products maker projects earnings will surpass the prior expected range of between 7 cents and 14 cents a share, and revenue is now forecast at $34.7 million to $34.9 million, at least $700,000 more than the high end of the previous outlook. One analyst polled by Thomson Financial is seeking income of 12 cents a share on revenue of $32.5 million. Shares were adding $3.20 to $15.34.

Particle Drilling Technologies ( PDRT) was surging after it announced it had inked a one-year agreement with an independent oil company that "currently ranks among the top five companies in the U.S. in terms of domestic onshore drilling and development activity" for technology and services, patented by Particle, allowing for faster drilling of difficult rock. Services begin this quarter in East Texas. Compensation, if any, will be determined by an unspecified gain-sharing formula based on Houston-based Particle's performance. Shares were up 34 cents, or 9.7%, to $3.85

California's SiRF Technology ( SIRF), which makes global positioning system components, posted higher fourth-quarter income that came to $15.7 million, excluding items, or 28 cents a share, on $70 million in revenue that met analysts' projections. Year ago-earnings totaled $12.2 million, or 22 cents a share. Wall Street had called for a 24-cent profit. Shares were gaining $4.27, or 17.9%, to $28.15.

Omnicell ( OMCL) rose after it more than doubled its fourth-quarter earnings. The Mountain View, Calif.-based company, which makes technology for use in health care facilities, said it earned $5.7 million, or 19 cents a share, on a non-GAAP basis. Revenue climbed 26.4% to $42.3 million from a year ago. Analysts were seeking 17 cents a share on $41.7 million in revenue. Shares were rising $1.38, or 7.4%, to $20.

Key Tronic ( KTCC) was tanking after profits for the quarter ended Dec. 30 totaled $345,000, or 3 cents a share, down from last year's $1 million, or 10 cents a share. Sales were up 10% to $49.8 million year over year. However, the electronic-manufacturing services company predicts lower sequential sales next quarter due to ebbing seasonal demand from "certain existing customers," which will probably range between $42 million and $47 million. Earnings should total between a penny and a dime a share. The Spokane Valley, Wash.-based company was losing $1.15, or 23.4%, to $3.76.

Neoware ( NWRE) slid on disappointing fiscal second-quarter results. Sales sank 19% from a year ago to $23.8 million, and profits fared worse. The Pennsylvania-based company earned $863,000, or 4 cents a share, compared with $3.7 million, or 22 cents a share, a year ago. The Street was looking for 8 cents a share on $24.6 million sales. Neoware, which makes client-computing devices and software, was down $1.17, or 9.2%, to $11.60.

Weight-loss services company NutriSystem ( NTRI) predicted disappointing results for the quarter already in progress. The Horsham, Pa.-based outfit expects income of between 82 cents and 86 cents a share on a top line of between $200 million and $210 million. On average, analysts are looking for 94 cents a share on $214 million mean estimate. Profits for the last quarter should total between 50 cents and 53 cents a share on revenue of between $131 and 133 million, which would exceed analysts' targets -- 47 cents a share on $127.8 million in revenue. Still, shares were falling $6.05, or 11.6%, to $46.