Thomas W. Weisel, chief executive officer of NationsBanc Montgomery Securities, is set to launch his own merchant bank when he leaves the company this month, according to bankers here.

At least three senior Montgomery executives have already agreed to join Mr. Weisel at his new firm, which would be based in San Francisco. Included in that group is Derek Lemke-von Ammon, Montgomery's senior managing director of private placements, sources said.

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