Index supplement to the prospectus dated April 17, 2026, the prospectus supplement dated April 17, 2026, the product supplement no. 3 - I dated April 17, 2026 and the underlying supplement no. 5 - I dated April 17, 2026 Registration Statement Nos. 333 - 293684 and 333 - 293684 - 01 Dated October 9, 2026 Rule 424(b)(3) OCTOBER 2026 MerQube US Tech+ Vol Advantage Index PERFORMANCE UPDATE The MerQube US Tech+ Vol Advantage Index (the “Index”) attempts to provide a dynamic rules - based exposure to the underlying asset to which the Index is linked (the “Underlying Asset”), while targeting a level of implied volatility, with a maximum exposure to the Underlying Asset of 500 % and a minimum exposure to the Underlying Asset of 0 % . Since February 9 , 2024 (the “Amendment Etfective Date”), the Underlying Asset has been an unfunded position in the Invesco QQQ Trust SM , Series 1 (the “QQQ Fund”), calculated as the excess of the total return of the QQQ Fund over a notional financing cost . Prior to the Amendment Etfective Date, the Underlying Asset was an unfunded rolling position in E - Mini Nasdaq - 100 futures (the “Futures Contracts”) . The Index is subject to a 6 . 0 % per annum daily deduction, and the performance of the Underlying Asset is subject to a notional financing cost deducted daily . The Index was established on June 22 , 2021 . Levels are published on Bloomberg using the ticker MQUSTVA . Hypothetical and actual historical performance: Sep 2016 through Sep 2026 MerQube US Tech+ Vol Advantage Nasdaq - 100 Index® Backtested Actual MerQube US Tech+ Vol Advantage Index Nasdaq - 100 Index® Backtested Actua Please see the footnotes at the bottom of this page and “Backtesting” on the following page for information on backtested performance and proxies. Hypothetical and actual historical returns and volatilities: Sep 2016 through Sep 2026 10 Year Volatility (Annualized) 10 Year Return (Annualized) 5 Year Return (Annualized) 3 Year Return (Annualized) 1 Year Return 31.21% 21.36% 9.49% 23.59% 16.05% MerQube US Tech+ Vol Advantage Index 22.81% 20.09% 15.66% 27.37% 23.21% Nasdaq - 100 Index® Sep 2026 Exposure Period 212.58% 09/01 - 09/03 206.15% 09/04 - 09/10 185.69% 09/11 - 09/17 230.10% 09/18 - 09/24 188.95% 09/25 - 09/30 Jul 2026 Aug 2026 Historical exposure at end - of - day: Jul 2026 through Sep 2026 Exposure Period Exposure Period 107.50% 07/01 141.95% 08/03 - 08/06 125.34% 07/02 - 07/09 181.94% 08/07 - 08/13 162.28% 07/10 - 07/16 209.42% 08/14 - 08/20 123.96% 07/17 - 07/23 182.68% 08/21 - 08/27 117.59% 07/24 - 07/30 212.58% 08/28 - 08/31 141.95% 07/31 Hypothetical and actual historical monthly and annual returns: Jan 2017 through Sep 2026 Year Dec Nov Oct Sep Aug Jul Jun May Apr Mar Feb Jan 84.72% - 1.64% 5.13% 12.47% - 2.99% 4.32% 9.42% - 7.52% 12.10% 2.96% 4.16% 15.25% 11.95% 2017 - 7.39% - 11.61% - 2.12% - 15.19% - 2.07% 12.54% 4.06% 2.14% 9.50% - 0.65% - 11.95% - 8.29% 22.65% 2018 62.25% 9.22% 10.26% 7.94% - 0.45% - 5.97% 1.90% 12.24% - 16.43% 13.01% 5.24% 4.92% 11.79% 2019 50.88% 6.26% 9.26% - 4.30% - 6.33% 15.09% 8.32% 4.77% 5.82% 12.28% - 4.28% - 9.33% 7.64% 2020 33.83% - 1.49% 2.71% 15.93% - 11.79% 8.08% 4.99% 12.03% - 3.00% 8.06% 1.32% - 3.04% - 1.19% 2021 - 47.49% - 13.28% 5.46% 3.07% - 11.92% - 8.01% 13.36% - 11.35% - 1.99% - 16.54% 4.56% - 5.11% - 15.70% 2022 67.74% 10.68% 16.79% - 4.10% - 11.20% - 4.95% 5.91% 9.11% 14.25% - 0.38% 9.08% - 1.98% 14.00% 2023 18.44% 0.34% 2.90% - 2.61% 0.30% 0.31% - 4.94% 11.75% 10.37% - 9.82% 0.24% 8.22% 2.07% 2024 5.87% - 3.36% - 5.09% 4.19% 9.60% - 1.61% 4.41% 9.64% 9.39% - 3.55% - 10.94% - 5.99% 1.60% 2025 21.44% 6.25% 3.56% - 10.07% - 5.06% 16.84% 23.55% - 7.06% - 4.68% 1.08% 2026 Historical performance measures for the Index represent hypothetical backtested performance through June 21, 2021 (labeled “Backtested” in the chart above); and actual performance from June 22, 2021 through September 30, 2026 (labeled “Actual” in the chart above). The hypothetical backtested and historical levels presented herein have not been verified by J.P. Morgan, and hypothetical historical levels have inherent limitations. PAST PERFORMANCE AND BACKTESTED PERFORMANCE ARE NOT INDICATIVE OF FUTURE RESULTS. Please see the Disclaimer on the following page. Investing in the notes linked to the Index involves a number of risks. See “Selected Risks” on page 2 of this document, “Risk Factors” section in the prospectus supplement and the relevant product supplement and underlying supplement and “Selected Risk Considerations” in the relevant pricing supplement. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the notes or passed upon the accuracy or the adequacy of this document or the accompanying product supplement, underlying supplement, prospectus supplement or prospectus. Any representation to the contrary is a criminal otfense. The notes are not bank deposits, are not insured by the Federal Deposit Insurance Corporation or any other governmental agency and are not obligations of, or guaranteed by, a bank.

OCTOBER 2026 | MerQube US Tech+ Vol Advantage Index Selected Risks Our affiliate, J.P. Morgan Securities LLC (“JPMS”), coordinated with MerQube (the “Index Sponsor”) in the development of the Index. The level of the Index will include a 6.0% per annum daily deduction. The level of the Index will include the deduction of a notional financing cost. The Index Sponsor may adjust the Index in a way that atfects its level, and the Index Sponsor has no obligation to consider your interests. The Index may not approximate its target volatility. The Index is subject to risks associated with the use of significant leverage. The Index may be

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