CheckFree shares jumped 12% Monday, and were still up 8% Tuesday, as Bank of America’s largest bill-paying service looks to be adding Fleet to its customer line amid the pending buyout by BofA.

With Bank of America’s success in the online bill-payment industry and the possibility of Fleet greatly increasing CheckFree’s business, the shares hopped $3.13 to $28.90, and traded as high as $29.90 on Nasdaq, Reuters reports.

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