蒙特利尔银行美股招股说明书(2025-10-29版)

The information in this preliminary pricing supplement is not complete and may be changed. This preliminary pricing supplement and the accompanyingproduct supplement, underlying supplement, prospectus supplement and prospectus are not an offer to sell these securities and we are not soliciting an offer tobuy these securities in any jurisdiction where the offer or sale is not permitted. Filed Pursuant to Rule 424(b)(2)Registration Statement No. 333-285508 Subject To Completion, dated October 29, 2025PRICING SUPPLEMENT dated November , 2025(To Product Supplement No. WF1 dated March 25, 2025,Underlying Supplement No. ELN-1 dated March 25, 2025,Prospectus Supplement dated March 25, 2025and Prospectus dated March 25, 2025)Bank of Montreal Market Linked Securities—Auto-Callable with Contingent Coupon and Contingent DownsidePrincipal at Risk Securities Linked to the Lowest Performing of the Nasdaq-100 Index®, the Russell 2000®Index and theS&P 500®Index due November 9, 2027 nLinked to the lowest performing of the Nasdaq-100 Index®, the Russell 2000®Index and the S&P 500®Index (each referred to as an “Underlier”)nUnlike ordinary debt securities, the securities do not provide for fixed payments of interest, do not repay a fixed amount of principal at stated maturity and are subject topotential automatic call prior to stated maturity upon the terms described below. Whether the securities pay a contingent coupon, whether the securities are automaticallycalled prior to stated maturity and, if they are not automatically called, whether you receive the face amount of your securities at stated maturity, will depend, in each case,on the closing value of the lowest performing Underlier on the relevant calculation day. The lowest performing Underlier on any calculation day is the Underlier that hasthe lowest closing value on that calculation day as a percentage of its starting valuenContingent Coupon.The securities will pay a contingent coupon on a semiannual basis until the earlier of stated maturity or automatic call if,and only if, the closing value of the lowest performing Underlier on the calculation day for that semiannual period is greater than or equal to its coupon threshold value. However, if the closingvalue of the lowest performing Underlier on a calculation day is less than its coupon threshold value, you will not receive any contingent coupon for the relevantsemiannual period. If the closing value of the lowest performing Underlier is less than its coupon threshold value on every calculation day, you will not receive anycontingent coupons throughout the entire term of the securities. The coupon threshold value for each Underlier is equal to 75% of its starting value. The contingent couponrate will be determined on the pricing date and will be at least 8.90% per annumnAutomatic Call.If the closing value of the lowest performing Underlier on any of the semiannual calculation days scheduled to occur from May 2026 to May 2027, inclusive, is greater than or equal to its starting value, the securities will be automatically called for the face amount plus a final contingent coupon paymentnPotential Loss of Principal.If the securities are not automatically called prior to stated maturity, you will receive the face amount at stated maturity if,and only if, the closing value of the lowest performing Underlier on the final calculation day is greater than or equal to its downside threshold value. If the closing value of the lowestperforming Underlier on the final calculation day is less than its downside threshold value, you will lose more than 25%, and possibly all, of the face amount of yoursecurities. The downside threshold value for each Underlier is equal to 75% of its starting valuenIf the securities are not automatically called prior to stated maturity, you will have full downside exposure to the lowest performing Underlier from its starting value if its closing value on the final calculation day is less than its downside threshold value, but you will not participate in any appreciation of any Underlier and will not receiveany dividends on the securities included in any UnderliernYour return on the securities will dependsolelyon the performance of the Underlier that is the lowest performing Underlier on each calculation day. You will not benefit in any way from the performance of the better performing Underliers. Therefore, you will be adversely affected ifany Underlierperforms poorly, even if the otherUnderliers perform favorablynAll payments on the securities are subject to our credit risk, and you will have no ability to pursue any securities included in any Underlier for payment; if Bank of Montreal defaults on its obligations, you could lose some or all of your investmentnNo exchange listing; designed to be held to maturity or automatic call On the date of this preliminary pricing supplement, the estimated initial value of the securities is $969.40 per security. The estimated initial value of the secu