J.P. Morgan Chase & Co. said late Thursday its board increased the bank's share buyback authorization by $1.88 billion, or nearly 30%. The increase is in addition to the $6.4 billion share purchase plan already approved by the board, J.P. Morgan said. Shares of J.P. Morgan advanced 0.9% to $59.29 after hours, after closing Thursday's session down 0.3%.
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