Despite final rules published last month, banks running ABCP conduits are continuing discussions with regulators in an effort to temper new capital rules they say could shift assets to non-U.S. banks and potentially reduce what has been a successful short-term funding source for U.S. companies.

"The requirements significantly increase the cost of being in this business, and they could shrink credit capacity," said Debbie Toennies,JPMorgan's head of conduit management and business development.

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