Banc One Corp. and First Chicago NBD Corp. officially completed their merger Friday, creating a new company called Bank One Corp.

The merger, announced April 13, creates the nation's fifth-largest bank holding company, with assets of more than $240 billion.

The integration of the two companies "is further along than in any merger we have done before," said president and chief executive officer John B. McCoy.

The new company, based in Chicago, trades its shares on the New York Stock Exchange under the symbol ONE.

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