1 EXHIBIT 15 ACKNOWLEDGMENT LETTER OF INDEPENDENT AUDITORS Shareholders and Board of Directors KeyCorp We are aware of the incorporation by reference in the following KeyCorp ("Key") Registration Statements of our review report, dated July 13, 1999, relating to the unaudited condensed consolidated interim financial statements of Key, included in the Quarterly Report on Form 10-Q for the quarter ended June 30, 1999. Form S-3 No. 33-58405 Form S-3 No. 333-10577 Form S-3 No. 333-55959 Form S-3 No. 333-59175 Form S-3 No. 333-64601 Form S-3 No. 333-76619 (Post-Effective Amendment No. 1) Form S-4 No. 33-31569 Form S-4 No. 33-44657 Form S-4 No. 33-51717 Form S-4 No. 33-55573 Form S-4 No. 33-57329 Form S-4 No. 33-61539 Form S-4 No. 333-19151 Form S-4 No. 333-61025 Form S-8 No. 2-97452 Form S-8 No. 33-21643 Form S-8 No. 333-49609 Form S-8 No. 333-49633 Form S-8 No. 333-65391 Form S-8 No. 333-70669 Form S-8 No. 333-70703 Form S-8 No. 333-70775 Form S-8 No. 333-72189 Form S-8 No. 33-31569 (Post-Effective Amendment No. 1 to Form S-4) Form S-8 No. 33-44657 (Post-Effective Amendment No. 1 to Form S-4) Form S-8 No. 33-51717 (Post-Effective Amendment No. 1 to Form S-4) Form S-8 No. 333-61025 (Post-Effective Amendment No. 1 to Form S-4) Pursuant to Rule 436(c) of the Securities Act of 1933, our report is not a part of the Registration Statements prepared or certified by accountants within the meaning of Section 7 or 11 of the Securities Act of 1933. /s/ Ernst & Young LLP Cleveland, Ohio August 9, 1999