In Wells Fargo, Wachovia, JPMorgan Chase and Washington Mutual, the financial tech industry had four of its biggest customers, adding up to about 20 percent of North American retail bank IT spending a year, according to TowerGroup.

You can guess what has the industry's vendors worried now. Across the landscape of payments, data systems, processing, cards, networks - you name it - the absorption of two national retail institutions is an unsettling development for third-party partners.

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