A former retail broker and bank analyst is accusing Wells Fargo & Co. of stealing his idea for mutual funds that become more conservative as an investor ages.

John C. "Jack" Boyle, 54, filed a copyright infringement lawsuit against the bank on Feb. 26 in U.S. District Court for the Southern District of New York. Also named as defendants were the bank's mutual fund distributor, Stephens Inc.; and a subadviser, Barclays Global Advisors, formerly Wells Fargo Nikko Investment Advisors.

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