LONDON — Amvescap PLC, the large publicly traded fund manager, announced Friday that its vice chairman, Charles T. Bauer, will retire at the end of the year.

A successor to Mr. Bauer, 81, has not been named, an Amvescap spokeswoman said.

Amvescap was formed in February 1997 when Aim Management Group Inc., a Houston fund manager co-founded by Mr. Bauer, was bought by London’s Invesco PLC. Mr. Bauer was chairman of Aim Management until this June.

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