DEC. 20, 10:31 A.M. -- Verisign Inc., a pioneering marketer of digital certificates for Internet transaction security, announced more than $1 billion worth of acquisitions Monday morning.

The Mountain View, Calif., company said it agreed to issue 5.6 million shares, worth about $733 million at the pre-opening stock price, for Signio Inc., a privately held company that offers an extensive menu of business-to-business and consumer payment services, with links to major credit and debit card processors. Signio, formerly known as PaymentNet and partly owned by Intuit Inc., Bank of America Corp., and Wells Fargo & Co., said it has nearly 2,000 merchant clients and 200 resellers.

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