Updated from 12:51 p.m. EDT

Shares of

Micromuse

(MUSE)

were among the best-performing technology stocks Monday, rising 20.9% after the company announced fourth-quarter earnings that easily topped expectations and predicted that first-quarter earnings and sales would be ahead of expectations.

Excluding items, the business software company posted a profit of 7 cents a share on sales of $36.3 million. Analysts surveyed by Thomson First Call were expecting a profit of 1 cent a share on sales of $34.6 million. During last year's fourth quarter the company posted a profit of 6 cents a share on sales of $33.7 million. Looking ahead, Micromuse forecast first-quarter pro forma earnings of 3 cents a share on sales of $36 million to $37 million. Analysts had been expecting earnings of 2 cents a share on sales of $35.8 million. Shares traded up 96 cents to $5.56.

Taser International

(TASR)

rose 5.8% after the company announced that its stun guns were approved for trials by the South Korean National Police Agency. Taser said the agency decided to evaluate the X26 device after successful trials by the police SWAT and Counter-Terrorism Institute. The initial order of 100 Taser X26 units marks the first time that general-duty officers will use the weapon. If the evaluation goes well, the national police agency plans to supply the weapons to officers in 14 police agencies in 2005. Shares traded up $3.35 to $60.85.

Shares of

Overstock.com

(OSTK) - Get Report

fell 4.8% after the company said it would sell a combination of stock and debt to fund its working capital requirements and general corporate purposes. The online closeout retailer said it plans to sell 1 million shares of stock as well as $75 million in convertible senior notes due November 2011. Shares traded down $2.90 to $57.30.

Maxtor

(MXO)

fell 1.8% after the company announced the resignation of its CEO, Paul Tufano. Tufano, who had also been serving as acting chief financial officer, resigned from his board position as well. Chairman C.S. Park will serve as CEO, effective immediately. Tufano's resignation comes just a month after the resignation of Michael Bless, who served as chief financial officer for about two months. The company said its search for a permanent CFO would continue. Shares of Maxtor traded down 7 cents to $3.85.

Shares of

ePlus

(PLUS) - Get Report

fell 7% after the company posted an 8% decrease in second-quarter earnings. The enterprise cost management company posted a profit of $2.5 million, or 27 cents a share, on sales of $153.9 million. A year ago the company earned $2.7 million on sales of $85.6 million. Total costs and expenses jumped 85% during the quarter to $150 million. The higher expenses were the result of acquisition costs, legal fees associated with an ongoing patent infringement suit, and costs related to Sarbanes-Oxley compliance. Shares traded down 82 cents to $10.94.

Other technology volume leaders included

Sirius Satellite Radio

(SIRI) - Get Report

, up 28 cents to $4.45;

Microsoft

(MSFT) - Get Report

, up 50 cents to $27.39;

Sun Microsystems

(SUNW) - Get Report

, up 23 cents to $5.09;

Intel

(INTC) - Get Report

, up 8 cents to $23.77; and

Cisco

(CSCO) - Get Report

, up 29 cents to $19.55;

Nortel Networks

(NT)

, up 8 cents to $3.11; and

Lucent

(LU)

, up 15 cents to $4.05.