Shares of Silicon Labs ( SLAB) were among technology's winners Monday, surging 23% after the chipmaker posted better-than-anticipated third-quarter results and issued fourth-quarter sales guidance that pleased investors.

The company reported a loss of $745,000, or 1 cent a share, on sales of $103.9 million. Excluding items, the company would have earned $14.5 million, or 26 cents a share. Analysts surveyed by Thomson First Call expected earnings of 24 cents a share, before items, on sales of $101.6 million. A year ago, the company posted earnings of $21 million, or 39 cents a share, on sales of $121 million. Excluding items, the company would have earned $22 million, or 40 cents a share, in the year-ago period.

Looking ahead, Silicon Labs forecast fourth-quarter sales of $104 million to $108 million. Analysts project sales of $104.4 million. Shares were trading up $6.02 to $32.70.

Acxiom ( ACXM) rose 5% after its largest shareholder, ValueAct Capital, boosted its bid to buy the data-services company to $25 a share from its previous offer of $23 a share. Acxiom had rejected ValueAct's first offer, saying the price was too low.

In a letter to Acxiom's board Friday, ValueAct said that Acxiom's most recent financial results, released on Oct. 19, confirm that the company is in need of new leadership. "The second-quarter results reported on Oct. 19 further confirm our belief that assets are being poorly deployed, opportunities missed, and that shareholder value is being eroded by current management," ValueAct said in a regulatory filing. "It is clear to us that there is an urgent need for a fundamental change in the company's strategic direction. It is also clear that the only way to bring about that change is by replacing Acxiom's leadership." Acxiom shares recently gained $1.09 to $21.13.

Shares of Manugistics ( MANU) moved lower after the company announced the resignation of its chief financial officer. The software company said that Raghavan Rajaji resigned so that he could accept a position with another company. Rajaji will remain with the company on an interim basis until a permanent replacement is found. Shares were trading down 6 cents, or 3%, to $1.95.

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