Updated from 12:59 p.m. EDT

Shares of



were among the worst-performing technology stocks Tuesday, falling 15.7% after the company announced the resignation of its chief executive.

The integrated circuits maker said Walid Maghribi resigned "because of disagreements with the board over growth and prospects for the company." Doug McBurnie, who will serve as interim president and CEO until a permanent replacement is found, will replace Maghribi, whose resignation is effective immediately. Shares traded down 90 cents to $4.83.

Evergreen Solar


rose 12.9% after the company said its "string ribbon" manufacturing process could potentially produce silicon wafers thinner than 150 microns. Evergreen said that its pilot operations have shown that it can "manufacture wafers using one-third of the silicon required by conventional methods." The company said that current cutting techniques make it difficult to produce wafers that are as thin as 150 microns and said that this gives the company a "defensible competitive advantage." The company has filed a patent application for its thin wafer technology, it said. Shares traded up 40 cents to $3.50.

Shares of

Greenfield Online


rose 5.2% after the Internet survey solutions company sold 4.5 million shares of stock at $18.16 apiece in a secondary offering, raising about $76 million. Selling stockholders, meanwhile, sold an additional 1.5 million shares, resulting in net proceeds of almost $26 million. Shares traded up 94 cents to $19.10.

Comtech Telecommunications

(CMTL) - Get Report

rose 6.5% after the company posted first-quarter earnings results that easily topped expectations. The communications company earned 46 cents a share on sales of $56.1 million. Analysts surveyed by Thomson First Call were expecting earnings of 32 cents a share on sales of $54.6 million. Earnings results were helped a better product mix, which boosted margins. Shares traded up $2.10 to $34.30.

Shares of



moved 8.1% higher Tuesday, a day after the company posted big gains in first-quarter earnings and sales. Excluding items, the company posted pro forma income of $9 million on sales of $257.1 million. A year ago, CMGI reported a pro forma loss of $3.2 million on sales of $94.9 million. The big year-over-year increases were primarily attributed to the acquisition of Modus Media, the company said. Shares traded up 20 cents to $2.68.

Other technology volume leaders included

Sirius Satellite Radio

(SIRI) - Get Report

, up 92 cents to $9.01;


(MSFT) - Get Report

, down 30 cents to $27.03;


(CSCO) - Get Report

, down 16 cents to $19.66;



, up 20 cents to $2.68;


(INTC) - Get Report

, down 53 cents to $23.48; and



, down 9 cents to $3.78.