Atlanta-based investment firm Invesco Ltd. (IVZ) - Get Report is in talks to purchase a piece of Guggenheim Partners investment management business, sources told Barron's Thursday. 

Invesco has nearly $860 billion in assets under management as of June 30, compared to Guggenheim's $237 billion in assets.

There have been rumors of infighting among Guggenheim CEO Mark Walter and lead manager Scott Minerd, reports that Walter has denied. 

"There is no power struggle between Scott and me at Guggenheim," Walter said in a statement, according to Barron's. 

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