Canadian Imperial Bank of Commerce

Prospectus • Sep 2, 2025

THIRD PROSPECTUS SUPPLEMENT DATED 29 AUGUST 2025

CANADIAN IMPERIAL BANK OF COMMERCE

(a Canadian chartered bank)

UK Structured Note Prospectus

This third prospectus supplement (the "Third Prospectus Supplement") dated 29 August 2025 has been prepared in connection with the base prospectus dated 24 January 2025 as supplemented by the first prospectus supplement dated 28 February 2025 and the second prospectus supplement 30 May 2025 (the "Second Prospectus Supplement" and, together with the base prospectus and the first prospectus supplement, the "Base Prospectus") in relation to the Structured Note Issuance Programme (the "Programme") of Canadian Imperial Bank of Commerce ("CIBC" or the "Issuer"). The Base Prospectus comprises a base prospectus for the purposes of Article 8 of Regulation (EU) 2017/1129 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018, as amended (the "UK Prospectus Regulation").

This Third Prospectus Supplement constitutes a supplement to the Base Prospectus for purposes of Article 23(1) of the UK Prospectus Regulation. This Third Prospectus Supplement is supplemental to, and must be read in conjunction with, the Base Prospectus.

This Third Prospectus Supplement has been approved by the Financial Conduct Authority as the United Kingdom competent authority under the UK Prospectus Regulation, as a supplement to the Base Prospectus in compliance with the UK Prospectus Regulation.

The purpose of this Third Prospectus Supplement is to:

• (a) incorporate by reference in the Base Prospectus the most recent comparative unaudited interim consolidated financial statements of CIBC (including CIBC's management's discussion & analysis thereof) for the period ended 31 July 2025 set out in CIBC's third quarter 2025 report to shareholders (the "CIBC Third Quarter 2025 Report to Shareholders"); and
• (b) update the paragraph in the General Information section of the Base Prospectus relating to significant or material adverse change.

Terms defined in the Base Prospectus have the same meaning when used in this Third Prospectus Supplement. To the extent that there is any inconsistency between (a) any statement in this Third Prospectus Supplement or any statement incorporated by reference into the Base Prospectus by this Third Prospectus Supplement and (b) any other statement in, or incorporated by reference in the Base Prospectus, the statements in (a) above will prevail.

CIBC accepts responsibility for the information in this Third Prospectus Supplement. To the best of the knowledge of CIBC the information contained in this Third Prospectus Supplement is in accordance with the facts and makes no omission likely to affect its import.

Save as disclosed in this Third Prospectus Supplement or in any document incorporated by reference in the Base Prospectus by virtue of this Third Prospectus Supplement no significant new factor, material mistake or material inaccuracy relating to the information included in the Base Prospectus which may affect the assessment of the Notes issued under the Programme has arisen or been noted, as the case may be, since the approval by the Financial Conduct Authority (the "FCA") of the Second Prospectus Supplement.

In accordance with Article 23(2) of UK Prospectus Regulation and PRR 3.4.1UK, investors who have already agreed to purchase or subscribe for the Notes before this Second Prospectus Supplement is published have the right, exercisable within two working days after publication of this Second Prospectus Supplement, to withdraw their acceptances. The final date of the right of withdrawal will be 2 September 2025. To exercise the right of withdrawal investors may contact the Issuer at 81 Bay Street, CIBC Square, Toronto, Ontario Canada M5J 0E7, Attention: Investor Relations.

DOCUMENTS INCORPORATED BY REFERENCE

The following information supplements the section entitled "Documents Incorporated by Reference" at pages 149 to 151 of the Base Prospectus and further updates the list of documents incorporated by reference in the Base Prospectus.

The following document, which has been previously published or is simultaneously published and filed with the FCA, shall be incorporated by reference in, and form part of, the Base Prospectus:

a) the sections of the CIBC Third Quarter 2025 Report to Shareholders identified in the following cross-reference list, which includes, among other things, the comparative unaudited interim consolidated financial statements for the three and nine-month periods ended 31 July 2025 with comparative unaudited interim consolidated financial statements for the three and nine-month periods ended 31 July 2024 prepared in accordance with International Accounting Standard (IAS) 34 "Interim Financial Reporting":

Information	Page numbers refer to the CIBC Third Quarter 2025 Report to Shareholders
Management's Discussion and Analysis	1-50
Comparative Unaudited Interim Consolidated Financial Statements	51-75
Consolidated balance sheet	52
Consolidated statement of income	53
Consolidated statement of comprehensive income	54
Consolidated statement of changes in equity	55
Consolidated statement of cash flows	56
Notes to the interim consolidated financial statements	57-75

Any information in CIBC's Third Quarter 2025 Report to Shareholders that is not listed in the crossreference list is not incorporated by reference in the Base Prospectus. Such information is either not relevant for prospective investors or is covered elsewhere in the Base Prospectus.

The CIBC Third Quarter 2025 Report to Shareholders is available at the following link: https://www.cibc.com/content/dam/cibc-public-assets/about-cibc/investor-relations/pdfs/quarterlyresults/2025/q325report-en.pdf

GENERAL INFORMATION

The paragraph entitled "Significant or Material Adverse Change" in the section entitled "General Information" found at page 465 of the Base Prospectus is deleted and replaced with the following:

"Since 31 July 2025, the last day of the financial period in respect of which the most recent interim unaudited published consolidated financial statements of the Issuer have been prepared, there has been no significant change in the financial performance or financial position of the Issuer and its subsidiaries taken as a whole. Since 31 October 2024, the date of its last published comparative audited consolidated financial statements, there has been no material adverse change in the prospects of the Issuer and its subsidiaries taken as a whole."

GENERAL

If a document which is incorporated by reference into this Third Prospectus Supplement itself incorporates any information or other documents therein, either expressly or implicitly, such information or other documents will not form part of this Third Prospectus Supplement or the Base Prospectus for purposes of the UK Prospectus Regulation except where such information or other documents are specifically incorporated by reference into the Base Prospectus by virtue of this Third Prospectus Supplement or where this Third Prospectus Supplement is specifically defined as including such information.

In accordance with Article 21.2 of the UK Prospectus Regulation, copies of this Third Prospectus Supplement, the Base Prospectus and the documents incorporated by reference in each can be (i) viewed on the Issuer's website at Structured Note Issuance Programme | CIBC and (ii) obtained on written request and without charge from CIBC at the registered office of CIBC at 81 Bay Street, CIBC Square, Toronto, Ontario Canada M5J 0E7, Attention: Investor Relations. In addition, representatives of the Provincial and Territorial securities regulatory authorities of Canada have engaged a service provider to operate an Internet web site through which all of the documents incorporated herein by reference that CIBC files electronically can be retrieved. The address of the site is www.sedarplus.com. Please note that information on the websites or URL's referred to herein does not form part of this Third Prospectus Supplement or the Base Prospectus unless the information has been incorporated by reference into this Third Prospectus Supplement or the Base Prospectus.