NEW YORK (Dow Jones) -- Global Payments Inc. (GPN), one of the largest processors of Visa Inc. (V) and MasterCard Inc. (MA) card transactions, is working around the clock to stem fallout from a data breach that exposed as many as 1.5 million cardholder accounts, executives said Monday.

The Atlanta-based company believes it has entirely contained an intrusion of its processing system it discovered in early March, which it disclosed late Friday after trading of its stock was halted following a Wall Street Journal report naming it as the source of a breach.

Since the incident came to light, Visa removed Global Payments from a list of approved service providers it maintains, though the company remains able to continue processing Visa card payments, Global Payments Chairman and Chief Executive Paul Garcia said.

"We are working around the clock literally ... with all the card associations to get" back in compliance, Garcia said during a conference call with analysts.

On Sunday, Global Payments released additional information about the breach, saying it believes less than 1.5 million accounts were exposed. It said the accounts were limited to North America, and cardholder names, addresses and Social Security numbers were not obtained in the breach. However, other information, including card numbers that can be used to create counterfeit cards was exported from its system.

"We have a high degree of confidence in that number," Garcia said, stressing the company will update investors if it determines the size of the breach has changed.

The company has set up a website for consumers seeking information about the breach at www.2012infosecurityupdate.com.

Global Payments has not quantified the total cost associated with the breach, though it expects to record a charge once it has determine all steps it will need to take to rectify the situation, executives said.

Greg Smith, an analyst with Sterne Agee, said he expects expenses stemming from the breach to be in the "tens-of-millions of dollars."

"We do view the situation as manageable from both a financial and competitive standpoint," Smith wrote in a research note Monday.

News of the breach sparked new concerns over security in the credit-card industry. The incident potentially affects cards bearing the logos of Visa and MasterCard, as well as Discover Financial Services (DFS) and American Express Co. (AXP), though the card companies' systems were not breached.

Visa and MasterCard have been notifying banks about the incident in recent days. Visa told the banks that the cards were exposed between Jan. 21 and Feb. 25, according to a memo reviewed by The Wall Street Journal.

Global Payments did not disclose specific details about how the attack occurred but said it affected a "subset" of its North American processing system. Federal law enforcement, including the U.S. Secret Service, are investigating the incident. Total costs to the company will also depend on steps banks must take to rectify fraud that may occur, for which Global Payments is "absolutely" on the hook, Garcia said.

Global Payments' shares were down 3.4% at $45.90 in recent trading. The shares sank more than 9% to $47.50 midday Friday before the stock was halted for the rest of the day.

The size of breach based on current estimates is relatively small compared with prior breaches. As many as 130 million cardholder accounts were exposed in a breach involving Heartland Payment Systems Inc. (HPY) disclosed in 2009. CardSystems Solutions exposed as many as 40 million accounts in 2005. Some credit-card networks later dropped CardSystems as a processor entirely, and the company eventually sold assets to another company.

Heartland expensed about $147.1 million in costs related to its breach, including about $110 million for settlements with Visa and MasterCard, according to analysts.

TJX Cos. (TJX), which disclosed a breach in 2007 that involved 40 million to 90 million card accounts, incurred $256 million in costs, according to Sanjay Sakhrani, an analyst with Keefe, Bruyette & Woods.

How Global Payments fares financially will depend on the nature of the breach and what steps merchant clients and card-issuing banks have to take in response to the incident, said Daimon Geopfert, national leader of security and privacy consulting for McGladrey & Pullen LLP.

"They're going to have to pay the price," Geopfert said. "There's no way around that but it might not be a death sentence."

Global Payments is what is known in the payments industry as a merchant acquirer, which contracts with merchants to provide card processing. The company is the seventh-largest merchant acquirer in the U.S. based on the volume of Visa and MasterCard payments it processed in 2011, according to The Nilson Report, a payments-industry newsletter.

Visa's decision to remove Global Payments from a list of companies that meet industry-enforced security standards known as PCI, or Payment Card Industry, requirements does not preclude the company from signing up new merchants, Garcia said.

However, experts say it could make merchants leery of doing business with the company.

As of last weekend, MasterCard had not taken a similar step, though Garcia warned it would not be "unexpected to have MasterCard take similar action."

Analysts peppered management with questions over how its lack of compliance with the standards could affect costs for it and its merchant clients in the future.

"Clearly not being PCI compliant has financial liability," Garcia said, adding the company is still working on quantifying total costs.

Global Payments also reported a fiscal third-quarter profit of $57.9 million, or 73 cents per share, up 21% from $47.8 million, or 59 cents a share, from a year earlier. Cash earnings per share rose to 83 cents from 71 cents, while analysts polled by Thomson Reuters estimated earnings of 84 cents a share.

-By Andrew R. Johnson, Dow Jones Newswires; 212-416-3214; andrew.r.johnson@dowjones.com

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