Updated from 12:19 p.m.

Shares of ValueClick ( VCLK) were among technology's winners Tuesday, rising 5.5% after the company backed its second-quarter earnings estimate and lifted its full-year guidance.

The online advertising and technology company now expects full-year earnings of 38 cents to 40 cents a share on sales of $222 million to $226 million. Previously, the company expected earnings of 37 cents to 39 cents a share on sales of $218 million to $223 million. Analysts surveyed by Thomson First Call are expecting earnings of 39 cents a share on sales of $223 million. For the second quarter, the company continues to expect earnings of 8 cents a share on sales of $52 million to $53 million. Analysts are expecting earnings of 8 cents a share on sales of $52.6 million. Shares traded up 56 cents to $10.83.

Catuity ( CTTY) soared 312.5% after the microcap company announced a deal with CertifiChecks. As part of the deal, Catuity will provide its hosted loyalty and gift card software to CertifiChecks' 70,000-plus merchants across the U.S. CertifiChecks will be the first company to deploy Catuity's new Catuity Advanced Loyalty System as a turnkey, hosted solution, Catuity said. Financial terms of the deal were not disclosed. The system will be deployed early in the third quarter. Daytraders bid the stock up $12.50 to $16.50 on more than 422 times average daily volume.

Shares of IBM ( IBM - Get Report) traded actively after the company reached an agreement with NiSource ( NI - Get Report) that calls for IBM to provide a host of business transformation and outsourcing services to NiSource. The 10-year deal is worth about $1.6 billion. NiSource expects to realize about $530 million in operating and capital cost savings across its 15 primary operating subsidiaries during the life of the contract, it said. IBM will begin service delivery on July 1, 2005. Shares of IBM traded down 14 cents to $76.41.

Intervoice ( INTV) fell 7.9% after the provider of data and voice solutions posted first-quarter results that topped estimates but warned that second-quarter sales would fall short of expectations. The company earned $3.9 million, or 10 cents a share, on sales of $43.3 million. Analysts were expecting earnings of 7 cents a share on sales of $42.6 million. A year ago the company earned $3.2 million, or 8 cents a share, on sales of $41.9 million. Looking ahead, Intervoice forecast second-quarter sales of $40 million to $45 million. Analysts are expecting sales of $46.6 million. Shares traded down 76 cents to $8.86.

Shares of Merix ( MERX) fell 10.5% after the maker of printed circuit boards previewed fourth-quarter results that were well below expectations and warned that first-quarter results would fall shy as well. Instead of posting pro forma earnings of 4 cents to 5 cents a share -- as the company had previously forecast -- the company reported a pro forma loss of 1 cent to 2 cents a share. Sales, meanwhile, were about $51.6 million, slightly ahead of the $50 million to $51.5 million that Merix expected. Analysts were expecting a profit of 4 cents a share on sales of $51 million. Looking ahead, Merix expects to post a first-quarter pro forma loss of 2 cents to 5 cents a share on sales that will be comparable with fourth-quarter results. Guidance does not include business from Eastern Pacific Circuits, which won't be part of Merix until late July. Analysts are expecting earnings of 7 cents a share on sales of $53.5 million. Shares traded down 72 cents to $6.15.

Other technology movers included Microsoft ( MSFT), up 4 cents to $25.15; Lucent Technologies ( LU), down 1 cent to $3.06; Cisco Systems ( CSCO), up 17 cents to $19.77; Intel ( INTC), up 28 cents to $27.18; Sun Microsystems ( SUNW), down 1 cent to $3.85; Sirius Satellite Radio ( SIRI), down 5 cents to $5.96; and Oracle ( ORCL), up 14 cents to $12.55.