JPMorgan Chase & Co. is raising some credit card balance-transfer fees to 5%, the highest among the nation's largest banking companies, citing growing regulation and costs after the government adopted curbs on the industry.

The biggest credit card issuer disclosed the increase in a notice mailed to customers this month that referred to "new federal regulations." The fee hike will take effect in August, about six months before a law designed to limit interest rate increases, fees and marketing practices takes effect.

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