SECURITIES AND EXCHANGE COMMISSION 450 Fifth Street, N.W. Washington, D.C. 20549 FORM 15 Certification and Notice of Termination of Registration under Section 12(g) of the Securities Exchange Act of 1934 or Suspension of Duty to File Reports Under Sections 13 and 15(d) of the Securities Exchange Act of 1934. Commission File No. 1-11792 Mercantile Bancorporation Inc. (Exact name of registrant as specified in its charter) P.O. Box 524 St. Louis, Missouri 63166-0524 314-418-2525 - -------------------------------------------------------------------------------- (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) Common Stock, par value $0.01; Preferred Stock Purchase Rights - -------------------------------------------------------------------------------- (Title of each class of securities covered by this Form) None - -------------------------------------------------------------------------------- (Titles of all other classes of securities for which a duty to file reports under Section 13(a) or 15(d) remains) Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports: Rule 12g-4(a)(1)(i) [X] Rule 12h-3(b)(1)(ii) [ ] Rule 12g-4(a)(1)(ii) [ ] Rule 12h-3(b)(2)(i) [ ] Rule 12g-4(a)(2)(i) [ ] Rule 12h-3(b)(2)(ii) [ ] Rule 12g-4(a)(2)(ii) [ ] Rule 15d-6 [ ] Rule 12h-3(b)(1)(i) [X] Approximate number of holders of record as of the certificate or notice date: 0 Pursuant to the requirements of the Securities Exchange Act of 1934, Firstar Corporation, as successor by merger to the registrant, has caused this certificate/notice to be signed on its behalf by the undersigned duly authorized person. Date: September 20, 1999 By: /s/ JENNIE P. CARLSON Name: Jennie P. Carlson Title: Senior Vice President, General Counsel and Secretary