Financial Results

Strong Q4'23 CET1 Ratio1 of 12.5% 12.3% +11 bps +21 bps Common Equity Tier 1 Ratio 1,2 -11 bps -1 bp -5 bps 12.5% Q3'23 Internal capital generation DRIP Acquisition and integration costs³ Source currency Other Q4'23 RWA Q4'23 CET1 ratio¹ of 12.5%, up from Q3'23 Internal capital generation DRIP shares issued from treasury Partially offset by Impact of acquisition and integration costs³ Higher source currency RWA mainly reflecting net increase from model and methodology updates and net asset quality changes, largely offset by risk transfer transactions Other mainly due to unrealized losses on fair value through OCI securities 1 The Common Equity Tier 1 (CET1) Ratio is disclosed in accordance with OSFI's Capital Adequacy Requirements (CAR) Guideline as set out by the Superintendent of Financial Institutions (OSFI), as applicable 2 Basis points may not add due to rounding 3 Includes acquisition and integration costs of $434MM after-tax ($583MM pre-tax) related to Bank of the West. See the Recent Acquisitions section of BMO's 2023 Annual MD&A for more information BMOM Financial Results ⚫ December 1, 2023 16

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