JPMorgan Chase & Co. announced plans to lay off about 21% of Washington Mutual Inc.'s employees by the end of 2009 as it weaves the thrift's operations into its retail-banking network.

JPMorgan, which acquired Wamu in September for $1.9 billion after it was seized by the government, told employees yesterday that it will lay off 4,000 workers by the end of January, according to JPMorgan spokesman Tom Kelly. Another 5,200 are being asked to stay on through various dates in 2009 to help with the deal's integration.

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