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EXHIBIT 99.1

Certification by the Chief Executive Officer Pursuant to 18 U. S. C. Section 1350, as
Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U. S. C. Section 1350, I, Peter R. Dolan, hereby certify that, to the best of my knowledge, Bristol-Myers Squibb Company's Amendment No. 1 to the Annual Report on Form 10-K for the year ended December 31, 2001 (the "Report"), as filed with the Securities and Exchange Commission on March 18, 2003, fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Bristol-Myers Squibb Company.

/s/ Peter R. Dolan

Peter R. Dolan

Chairman of Board and Chief Executive Officer

March 18, 2003

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by Bristol-Myers Squibb Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

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Certification by the Chief Executive Officer Pursuant to 18 U. S. C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002