<PAGE>
[BANK ONE CORPORATION Press Release Letterhead] Exhibit 99(a)
FOR IMMEDIATE RELEASE Contact: Stan Lata
(312) 732-6209
BANK ONE NAMES WELBORN TO HEAD RETAIL BANKING
Commercial Banking responsibilities realigned
CHICAGO, Nov. 6, 2000 - BANK ONE CORPORATION today announced the appointment of
R. Michael Welborn as head of Retail Banking. He will manage the nation's
fourth-largest retail network and continue to report to James Dimon, Bank One's
chairman and chief executive officer.
Welborn, 49, who most recently served as head of Middle Market Banking, succeeds
Kenneth T. Stevens.
"Mike is an energetic leader who has done an outstanding job in banking, and his
common-sense, hands-on management style will help us serve our customers better
and enable us to grow our retail business further," Dimon said. "Mike's broad
banking experience will help us continue our goal to distinguish ourselves as
the premier financial services company for consumers and small businesses."
Stevens will work with Welborn on an orderly transition. During his four years
with the company, Stevens united Bank One's 80 banks into a national line of
business with more than 30,000 employees, 1,800 banking centers and 6,000 ATMs,
as well as telephone and Internet banking.
"Ken has created a consistent approach across the country to helping our
customers achieve their dreams," Dimon said. "We will miss Ken's many
contributions to the company, and we wish him well in his future endeavors."
As a result of Welborn's new responsibilities, Bank One is making the following
changes in Commercial Banking.
David P. Bolger, who has headed Corporate Banking, will take on responsibility
for Middle Market, an area where he has spent most of his 20 years at the bank.
In addition, he will continue to oversee several Corporate Banking functions,
including treasury management services and the international group.
James S. Boshart, who heads capital markets, will pick up additional duties,
including large corporate domestic market segments.
(more)
<PAGE>
Page 2
"We're more closely aligning capital markets with the appropriate large
corporate functions to more effectively serve our customers," Dimon said. "Both
Dave Bolger and Jim Boshart are experienced leaders who have the strategic
skills needed to continue to build Commercial Banking."
The Commercial Bank includes Corporate Banking, which provides financial
services to companies with revenues exceeding $250 million, and Middle Market,
which serves companies with revenues between $5 million to $250 million.
In his new position, Welborn oversees a Retail Banking organization that serves
the savings, borrowing, cash management and investment needs of more than 8
million consumers and 450,000 small businesses in 14 states. During the first
three quarters of 2000, Retail generated more than $4.5 billion in revenue and
about one-third of the corporation's profits.
"My goal is to create great service for our customers throughout our retail
network," Welborn said. "We have a terrific opportunity to build upon our
capabilities as a truly national franchise, while providing added benefits for
our customers and creating greater value for shareholders."
Welborn, who joined Bank One in 1996 as Chairman of Bank One, Arizona, has
served in various commercial and retail banking executive positions during his
career. He was a principal of the Venture West Group, a merchant banking firm
in Arizona, served as chairman and chief executive officer of Citibank in
Arizona from 1988 until 1993, and held various executive positions with Crocker
National Corporation in California.
Welborn earned a bachelor's degree from Johns Hopkins University and an M.B.A.
degree from Harvard University.
Bank One Corporation (NYSE: ONE) is the nation's fourth-largest bank holding
company, with assets of more than $280 billion. Bank One offers a full range of
financial services to commercial and business customers and consumers. It can
be found on the Internet at www.bankone.com.
###
