Investor Presentation February 2024

Non-GAAP and Other Financial Measures Results and measures in this document are presented on a GAAP basis. Unless otherwise indicated, all amounts are in Canadian dollars and have been derived from our audited annual consolidated financial statements and our unaudited interim consolidated financial statements, prepared in accordance with International Financial Reporting Standards (IFRS). References to GAAP mean IFRS. We use a number of financial measures to assess our performance, as well as the performance of our operating segments, including amounts, measures and ratios that are presented on a non-GAAP basis, as described below. We believe that these non-GAAP amounts, measures and ratios, read together with our GAAP results, provide readers with a better understanding of how management assesses results. Management considers both reported and adjusted results and measures useful in assessing underlying ongoing business performance. Adjusted results and measures remove certain specified items from revenue, non-interest expense and income taxes, as detailed on page 57. Adjusted results and measures presented in this document are non-GAAP. Presenting results on both a reported basis and an adjusted basis permits readers to assess the impact of certain items on results for the periods presented, and to better assess results excluding those items that may not be reflective of ongoing business performance. As such, the presentation may facilitate readers' analysis of trends. Except as otherwise noted, management's discussion of changes in reported results in this document applies equally to changes in the corresponding adjusted results. Non-GAAP amounts, measures and ratios do not have standardized meanings under GAAP. They are unlikely to be comparable to similar measures presented by other companies and should not be viewed in isolation from, or as a substitute for, GAAP results. Examples of non-GAAP amounts, measures or ratios include: pre-provision pre-tax income, tangible common equity, amounts presented net of applicable taxes, adjusted net income, revenues, non-interest expenses, provision for credit losses, earnings per share, ROE, and adjusted efficiency, leverage and PCL ratios, growth rates and other measures calculated using adjusted results, which exclude the impact of certain items such as acquisition and integration costs, amortization of acquisition-related intangible assets, impact of divestitures, management of fair value changes on the purchase of Bank of the West, and initial provision for credit losses on Bank of the West purchased loan portfolio. BMO provides supplemental information on combined operating segments to facilitate comparisons to peers. Certain information contained in BMO's Management's Discussion and Analysis dated February 27, 2024, for the quarter ended January 31, 2024 ("First Quarter 2024 MD&A") is incorporated by reference into this document, including the Summary Quarterly Earnings Trend section in the First Quarter 2024 MD&A. Quantitative reconciliations of non-GAAP and other financial measures to the most directly comparable financial measures in BMO's financial statements for the period ended January 31, 2024, an explanation of how non-GAAP and other financial measures provide useful information to investors and any additional purposes for which management uses such measures, can be found in the Non-GAAP and Other Financial Measures section of the First Quarter 2024 MD&A. Further information regarding the composition of our non-GAAP and other financial measures is provided in the Glossary of Financial Terms section of the First Quarter 2024 MD&A. The First Quarter 2024 MD&A is available on the Canadian Securities Administrators' website at www.sedarplus.ca and BMO's website at www.bmo.com/investorrelations. BMOM Investor Presentation ⚫ February 2024 56

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