A story published in USA Today suggested the two sides have been involved in talks, with CIBC offering to pay $1.8 billion US for the Omaha-based online broker.
A senior source at CIBC said the whole story was fabricated.
Ameritrade stock jumped seven per cent on the Nasdaq Stock Market upon news of the deal.
While cautioning the deal is only speculation, an analyst with Standard & Poor's Corp. in New York says it would be a good move for CIBC.
"If they were to do it, I think it would be a good strategic move," Tanya Azarchs told the Globe and Mail. "They've been trying to assemble a complete product line here in the U.S., and this would fit in with that quite nicely."








