q32026earningspresentati

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2026 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F: Form 20-F ☒ Form 40-F ☐

BANCO SANTANDER, S.A. ________________________ TABLE OF CONTENTS Item 1. January - September 2026 Earnings presentation

9M’26 Earnings Presentation 28 October 2026

2 Important information Non-IFRS and alternative performance measures Banco Santander, S.A. (“Santander”) cautions that this presentation may contain financial information prepared according to International Financial Reporting Standards (IFRS) and taken from our consolidated financial statements, as well as alternative performance measures (APMs) as defined in the Guidelines on Alternative Performance Measures issued by the European Securities and Markets Authority (ESMA) on 5 October 2015, and other non-IFRS measures. The APMs and non-IFRS measures were calculated with information from Grupo Santander; however, they are neither defined or detailed in the applicable financial reporting framework nor audited or reviewed by our auditors. We use the APMs and non-IFRS measures when planning, monitoring and evaluating our performance. We consider them to be useful metrics for our management and investors to compare operating performance between accounting periods. Nonetheless, the APMs and non-IFRS measures are supplemental information; their purpose is not to substitute the IFRS measures. Furthermore, other companies, including some in our industry, may calculate or use APMs and non-IFRS measures differently, thus making them less useful for comparison purposes. APMs using environmental, social and governance labels have not been calculated in accordance with the Taxonomy Regulation or with the indicators for principal adverse impact in SFDR. For more details on APMs and non-IFRS measures, please see the 2025 Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the SEC) on 27 February 2026 (https://www.santander.com/content/dam/santander-com/es/documentos/informacion-sobre-resultados-semestrales-y-anuales-suministrada-a-la-sec/2026/sec-2025- annual-20-f-2025-disponible-solo-en-ingles-es.pdf), except with respect to the information and the audited financial statements included therein and superseded by the information and the audited financial statements included in our Report on Form 6-K furnished to the SEC on 1 April 2026 relating to certain recast financial information as a result of certain changes to the presentation of the Group’s financial information (https://www.santander.com/content/dam/santander-com/en/documentos/informacion-sobre-resultados-semestrales-y-anuales-suministrada-a-la-sec/2026/sec-recast-of-certain-financial-information-and-related- disclosure-for-the-three-years-ended-31-december-2025-en.pdf), as well as the section “Alternative performance measures” of our third quarter financial report, which was published on 28 October 2026 (https://www.santander.com/en/shareholders-and-investors/financial-and-economic-information#quarterly-results). Forward-looking statements Santander hereby warns that this presentation may contain 'forward-looking statements', as defined by the US Private Securities Litigation Reform Act of 1995. Such statements can be understood through words and expressions like 'expect', 'project', 'anticipate', 'should', 'intend', 'probability', 'risk', 'VaR', 'RoRAC', 'RoRWA', 'TNAV', 'target', 'goal', 'objective', 'estimate', 'future', 'ambition', 'aspiration', 'commitment', 'commit', 'focus', 'pledge' and similar expressions. They include (but are not limited to) statements on future business development, shareholder remuneration policy and non-financial information. However, risks, uncertainties and other important factors may lead to developments and results that differ materially from those anticipated, expected, projected or assumed in forward-looking statements. The important factors below and others mentioned in this presentation, as well as other unknown or unpredictable factors, could affect our future development and results and could lead to outcomes materially different from what our forward-looking statements anticipate, expect, project or assume: • general economic or industry conditions (e.g., an economic downturn; higher volatility in the capital markets; inflation; deflation; changes in demographics, consumer spending, investment or saving habits; and the effects of the armed conflicts in Ukraine and the Middle East, or the outbreak of public health emergencies in the global economy) in areas where we have significant operations or investments; • exposure to operational risks, including cyberattacks, data breaches, data losses and other security incidents; • exposure to market risks (e.g., risks from interest rates, foreign exchange rates, equity prices and new benchmark indices); • potential losses from early loan repayment, collateral depreciation or counterparty risk; • political instability in Spain, the UK, other European countries, Latin America and the US; • changes in monetary, fiscal and immigration policies and trade tensions, including the imposition of tariffs and retaliatory responses; • legislative, regulatory or tax changes (including regulatory capital and liquidity requirements) and greater regulation prompted by financial crises;

3 Important information • acquisitions, integrations, divestitures and challenges arising from deviating management’s resources and attention from other strategic opportunities and operational matters; • reputational risk and potential adverse reactions of stakeholders, including adverse effects on the market price of our securities • climate-related conditions, regulations, targets and weather events; • uncertainty over the scope of actions that may be required by us, governments and others to achieve goals relating to climate, environmental and social matters, as well as the evolving nature of underlying science and potential conflicts and inconsistencies among governmental standards and regulations. Important factors affecting sustainability information may materially differ from those applicable to financial information. Sustainability information is based on various materiality thresholds, estimates, assumptions, judgments and underlying data derived internally and from third parties. Sustainability information is thus subject to significant measurement uncertainties, may not be comparable to sustainability information of other companies or over time or across periods and its inclusion is not meant to imply that the information is fit for any particular purpose or that it is material to us under mandatory reporting standards. The sustainability information is for informational purposes only, without any liability being accepted in connection with it except where such liability cannot be limited under overriding provisions of applicable law; • our own decisions and actions, including those affecting or changing our practices, operations, priorities, strategies, policies or procedures; and • changes affecting our access to liquidity and funding on acceptable terms, especially due to credit spread shifts or credit rating downgrade for the entire group or core subsidiaries. Forward looking statements are based on current expectations and future estimates about Santander’s and third-parties’ operations and businesses and address matters that are uncertain to varying degrees, including, but not limited to developing standards that may change in the future; plans, projections, expectations, targets, objectives, strategies and goals relating to environmental, social, safety and governance performance, including expectations regarding future execution of Santander’s and third parties’ energy and climate strategies, and the underlying assumptions and estimated impacts on Santander’s and third-parties’ businesses related thereto; Santander’s and third-parties’ approach, plans and expectations in relation to carbon use and targeted reductions of emissions; changes in operations or investments under existing or future environmental laws and regulations; and changes in government regulations and regulatory requirements, including those related to climate-related initiatives. Forward-looking statements are aspirational, should be regarded as indicative, preliminary and for illustrative purposes only, speak only as of the date of this presentation and are informed by the knowledge, information and views available on such date and are subject to change without notice. Banco Santander is not required to update or revise any forward-looking statements, regardless of new information, future events or otherwise, except as required by applicable law. No offer or solicitation This presentation does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended (the “Securities Act”). No investment activity should be undertaken on the basis of the information contained in this presentation. By making this presentation available, no advice or recommendation is being given to buy, sell or otherwise deal in any securities or investments whatsoever. Past performance does not indicate future outcomes Statements about historical performance or growth rates must not be construed as suggesting that future performance, share price or earnings (including earnings per share) will necessarily be the same or higher than in previous periods. Nothing mentioned in this presentation should be taken as a profit and loss forecast. Third Party Information Regarding the data provided by third parties, neither Santander, nor any of its directors, managers or employees, either explicitly or implicitly, guarantees that these contents are exact, accurate, comprehensive or complete, nor are they obliged to keep them updated, nor to correct them in the case that any deficiency, error or omission were to be detected. Moreover, in reproducing these contents in by any means, Santander may introduce any changes it deems suitable, and may omit, partially or completely, any of the elements of this presentation, and in case of any deviation, Santander assumes no liability for any discrepancy.

Index 1 9M’26 Highlights Progress on our strategy 2 Group review 3 Final remarks 4 Appendix

5 €3.8bn +19% Q3'26 Und. profit Q3’26 Att. profit CET1 12.7% Efficiency 42.6% -2.8pp CoR 1.16% +3bps TNAVps + DPS +11% Strong quarterly profit, resulting in double-digit profit growth in 9M, with 17 million new customers YoY and high activity levels Continued efficiency gains and improved profitability, supported by ONE Transformation Solid balance sheet with sound credit quality and organic capital generation Disciplined capital allocation driving double-digit value creation and strong EPS growth Another strong set of results, comfortably on track to deliver our targets, with all global businesses contributing to mid-teens profit growth Note: YoY changes. In constant euros: Q3’26 underlying profit +14% and 9M’26 underlying profit +14%. Financials across the presentation incorporate Webster’s results for the first time, once incorporated into the Group on 20 August. All references to ex. M&A across the presentation exclude TSB and Webster. TNAVps + Cash DPS includes the €12.50 cent cash dividend per share paid in May 2026 and the €12.70 cent cash dividend per share approved in September that will be paid from 2 November 2026, all forming part of our ordinary shareholder remuneration policy against 2025 and 2026 results, respectively. Underlying RoTE 16.0% +1.1pp €11.2bn +16% 9M'26 Und. profit 9M’26 Att. profit €12.4bn€3.4bn Underlying EPS +21% +25% Statutory EPS

6 Higher revenue and lower costs are driving double-digit net operating income and profit growth Note: YoY changes. All references to variations in constant euros across the presentation include Argentina in current euros to mitigate distortions from a hyperinflationary economy. For further information, see the ‘Alternative Performance Measures’ section of the Quarterly Financial Report. Group underlying profit excludes: i) integration charges related to M&A (-€666mn in Q2’26 and Q3’26); ii) the capital gain resulting from the disposal of the Poland business in Q1’26 (€1,895mn); and iii) results related to the business subject to the Poland disposal in 9M’25 (€713mn) Group P&L Current Constant Current Constant € million 9M'26 9M'25 % % % % NII 34,614 31,599 10 8 7 5 Net fee income 10,349 9,462 9 7 9 7 Other income 1,844 2,182 -15 -16 -15 -16 Total revenue 46,807 43,243 8 7 6 5 Total costs -19,925 -19,623 2 0 -1 -2 Net operating income 26,882 23,620 14 12 12 10 LLPs -10,060 -8,908 13 10 12 9 Other results -1,051 -702 50 50 42 43 Underlying attributable profit 11,176 9,624 16 14 14 12 Non-recurring items 1,229 713 72 72 Attributable profit 12,405 10,337 20 18 Ex. TSB & Webster

7 Our unique business model, disciplined capital allocation, ONE Transformation and network businesses are driving operational leverage and profitable growth (1) In constant euros and like for like (i.e. excluding Poland in 2025 and TSB/Webster perimeter effects). (2) Value creation measured as TNAVps + cash DPS. (3) AI business value generated measured YtD and defined as incremental revenue, cost savings and lower loan-loss provisions generated by our Data & AI initiatives. (4) Latest estimate. Scale Customer focus Diversification ONE Transformation Network businesses Customer growth Webster acquisition completedM&A execution and integration AI business value generated3 €194mn in 9M’26Leveraging Tech & AI Front book RoTE4 21%Disciplined capital allocation driving best-in-class profitability YoY Costs down Every year1 YoY Higher value creation2 YoY Revenue up Every year1 YoY Increasing underlying RoTE +5% +11% +1.1pp -2%

8 Note: YoY changes. Customer projections include TSB and Webster. (1) In constant euros and like for like (i.e. excluding Poland in 2025 and TSB/Webster perimeter effects). (2) In constant euros based on 2025 FX. Annualized. More active customers, deeper relationships and structural cost efficiencies make profitability improvements sustainable over time +10mn 111mn +17mn 189mn +5% Active customers c.125mn in 2028 Fees per active customer € constant2 c.135 in 2028Customers >210mn in 2028 Cost per active customer € constant2 c.220 in 2028 Revenue Costs Up MSD every year1 Down every year1 on the back of ONE Transformation 129 249 +2% -5% Gravity & One App serving 54% of retail customers in 9M’26 >80% in 2028 -2%

9 2025 9M’26 Announced bolt-ons ONE Transformation AI -0.6pp Network businesses Global TechEfficiency ratio -1.8pp -0.2pp -0.4pp • CX for customer growth • Simplification & automation • Digital availability • Contact centres via digital self service • Increase network collaboration revenue • Reduce cost per transaction: -39% YoY cost per payment transaction in 9M’26 (-40% by 2028) • Build once and deploy across the Group • Leverage common architectures, cloud capabilities and data • Global vendor consolidation • Gravity 2.0 • Incremental cost for growth: €0 • Leverage AI to gain primacy with customers • AI to maximize cross- selling across businesses • Agentic commerce • Business value generated €194mn in 9M’26 (>€1bn 2025- 28) • TSB + Webster synergies c.-1pp c.-2ppc.-3pp c.-1pp c.-2pp ONE Transformation Consistent execution of ONE Transformation, targeted deployment of AI at scale and our three network businesses are delivering structural efficiency improvements +0.2pp 45.3% 45.3% 2025 c.36% 2028 target 42.6% Note: AI business value generated measured YtD and defined as incremental revenue, cost savings and lower loan-loss provisions generated by our Data & AI initiatives. Investor Day AI business value generated target defined as the annual run-rate versus the FY 2025 baseline.

10 N et w or k b us in es se s Double-digit profit increase supported by revenue growth and efficiency gains across all 5 global businesses Note: YoY changes in constant euros. Global businesses’ RoTEs are adjusted based on Group’s deployed capital. Openbank’s operating profitability calculated as PBT / Tangible Equity and excluding the additional provisions in UK auto finance (Motor Finance), booked in Q1’26 and Q2’26. (1) Openbank PBT including additional provisions in UK auto finance (Motor Finance): +2%. (2) Excluding the additional provisions in UK auto finance (Motor Finance). 2.5 +13% Underlying profit (€ bn) Efficiency9M’26 Underlying RoTE FY’28 underlying RoTE target Revenue (€ bn) Retail Group Openbank CIB Wealth Payments EBITDA margin >21% c.16% >20% >60% c.45% >20% 39.9% -2.9pp 40.4% -3.1pp 42.6% -3.8pp 34.6% -2.1pp 85.1% -6.4pp 42.6% -2.8pp 6.4 +12% 2.4 +15% 1.7 +19% 0.1 +147% 11.2 +14% 34.0% +2.4pp 16.0% +1.1pp 26.3 +6% 10.1 +5% 6.9 +14% 3.2 +10% 1.2 +15% 46.8 +7% PBT ex. Motor Finance1 Operating profitability RoTE218.0% +1.8pp 17.7% +1.0pp 19.2% +0.7pp 58.2% -0.6pp 10.4%

11 ex. M&A ex. M&A ex. M&A Note: data and YoY changes in constant euros. (1) Excluding M&A. Retail 9M’26 performance Cost per active customer (€) Non-commercial FTEs per mn customers1 9M’26 execution Fees (€ mn)Operating targets Operational leverage Revenue (€ mn) Costs (€ mn) Double-digit profit growth on the back of deeper customer relationships and the rollout of our global platforms ONE Transformation progressing at speed: customer interaction platform deployed in Spain and global app launched in Uruguay, now live in 5 countries Profitable loan growth and widespread increases in deposits underscoring our strength as a trusted partner and the value of our customer-centric model Excluding Argentina, CoR was broadly stable YoY at 1.08%, as a result of our prudent risk management Strong profit growth reflecting the benefits of ONE Transformation, with operating jaws of +8pp Loans €697bn +16% Deposits €711bn +16% CoR 1.20% +6bps Efficiency 39.9% -2.9pp Profit €6,445mn +12% RoTE 17.7% +1.0pp 188 178 9M'25 9M'26 4,722 5,084 9M'25 9M'26 +8% -5% -17% 24,810 26,277 9M'25 9M'26 +6% 10,614 10,497 9M'25 9M'26 -1%ex. M&A ex. M&Aex. M&A +3% +6% +9% +3% -5%+7% 473 392 Sep-25 Sep-26

12 ex. Webster ex. Webster ex. Webster 9M’26 performance ex. Webster +5% 9,603 10,062 9M'25 9M'26 Openbank Note: data and YoY changes in constant euros. PBT excluding Motor Finance. Operating profitability calculated as PBT / Tangible Equity. PBT including Motor Finance: +2%. (1) The additional provisions in 9M’26 in UK auto finance (Motor Finance) were €245mn gross, €194mn net of tax and non-controlling interest, booked in Q1’26 and Q2’26. Total customers (mn) Cost per active customer (€)Operating targets 9M’26 execution More integrated, scalable and efficient business, while accelerating cross-selling and AI-led transformation Loans up, driven by growth in auto Openbank US has raised $11bn deposits since launch providing c.$150mn in net funding cost savings p.a. PBT +13% excluding Motor Finance1, on the back of 8pp positive jaws, with revenue up and costs down at the same time Profit affected by c.€200mn from Motor Finance in H1 and c.€200mn from the end of EV fiscal benefits in US Improved value proposition, strong customer momentum and disciplined execution, leading to +8pp operating jaws and +13% underlying PBT Revenue (€ mn) Costs (€ mn)Operational leverage Loans €231bn +7% Efficiency 40.4% -3.1pp Deposits €177bn +37% CoR 2.10% +4bps ex. Motor Finance 16.2% 18.0% +0.1pp +1.8pp Operating profitability -11% 229 205 9M'25 9M'26 4,172 4,066 9M'25 9M'26 -3%ex. Webster PBT €2,544mn +13% ex. Motor Finance +3% -5% +3% +2% +11% 26.2 32.2 Sep-25 Sep-26 +23%

13 15% c.18% 10% +5pp +3pp 2025 Santander US Santander US standalone improvement 2028 Santander US standalone Webster scale, funding optim. and synergies 2028 combined post synergies Santander US RoTEimprovement path Note: data and YoY changes in constant euros. (1) Full run-rate synergies expected to be achieved by the end of 2028. (2) Loan-to-deposit ratio: net loans including reverse repos / deposits including repos. (3) ABF: Asset-backed funding. Our US franchise delivered 13% RoTE before Webster, which will further accelerate our path to top-tier profitability San US Webster’s contribution Enhances our scale, adding a complementary branch footprint, creating a leading Northeast deposit franchise Creates a more balanced business, combining Webster’s high-quality retail and commercial franchise with our strength in consumer, diversifying our loan portfolio Further strengthens our funding profile, combining Openbank’s high-yield deposits with a diversified deposit base, including c.$10bn Health Savings Accounts Brings Santander US’s loan-to-deposit ratio <100% and accelerates our path to top-tier profitability and efficiency, supported by c.$800mn of cost synergies1 Santander US improved funding profile 9M’26 Santander US performance +2pp already achieved 113 <100 Sep-24 Sep-26 25 16 Sep-24 Sep-26 Loan-to- deposit ratio2 (%) ABF3 ($ bn) -13pp -36% €175bn €125bn +59% +13% ex. Webster Loans €158bn €96bn +84% +12% ex. Webster Deposits 1.39% -24bps CoR €1,514mn €1,425mn +32% +24% ex. Webster Profit 12.6% +2.1pp RoTEEfficiency 44.7% -4.6pp

14 Better efficiency and profitability driving profit up 15% on the back of our growth initiatives CIB Note: data and YoY changes in constant euros. Gross collaboration revenue (€ mn) Total revenue / avg. RWAs (%) Fees (€ mn) Costs (€ mn)Operating targets Recurrency performance Solid execution of our strategy focused on disciplined capital allocation, driving RoTE up to 19%, while maintaining a leading position in efficiency Good activity levels across business lines, especially in Global Banking and Global Markets, supported by our growth initiatives and our diversified business model Double-digit profit growth on the back of 8pp positive operating jaws, with strong revenue growth (+14%) across business lines and most markets 9M’26 performance9M’26 execution Efficiency 42.6% -3.8pp Loans €178bn +28% Deposits €150bn +12% CoR 0.32% +24bps RoTE 19.2% +0.7pp Profit €2,433mn +15% 2,804 2,956 9M'25 9M'26 +5% 2,046 2,196 9M'25 9M'26 +7% 7.8 8.4 9M'25 9M'26 +0.6pp 1,862 1,995 9M'25 9M'26 +7%

15 Distribution fees (€ mn) Wealth High-teen profit growth, with fees up 11% backed by strong client inflows and our focus on value-added solutions and services Note: data and YoY changes in constant euros. Private Banking CAL (customer assets and liabilities) measured as Private Banking AuMs + loans and deposits. Distribution fees including those registered in other businesses. Private Banking (€ mn) Insurance and Asset Management Solutions (€ mn) Enhanced global advisory model with improved connectivity across countries and global businesses AuMs reached new record levels, on the back of solid commercial activity and market performance. GWPs grew 20% Insurance represents one of the Group’s biggest opportunities, with significant upside from today’s c.10% penetration to best-in-class levels Strong profit growth, driven by revenue, growing well above costs, on the back of client inflows and our focus on fee-generating activities PAT + distribution fees Insurance (€ mn)Operating targets Revenue growth 9M’26 performance9M’26 execution Gross written premiums €10.0bn +20% Efficiency 34.6% -2.1pp Profit €1,651mn +19% RoTE 58.2% -0.6pp AuMs €588bn +11% CAL (PB) €388bn +13% +9% +13% 1,792 1,870 9M'25 9M'26 1,008 1,272 9M'25 9M'26 +4% +26% 1,168 1,326 9M'25 9M'26 1,820 1,978 9M'25 9M'26

16 Payments Note: data and YoY changes in constant euros. Getnet Platforms transactions include processed A2A and card transactions. (1) % open market revenue vs. Payments total revenue, excluding revenue from our cards platform. (2) # transactions includes Acquiring (Getnet) plus A2A and card transactions managed (Getnet Platforms). # transactions2 (bn) Key strategic priorities driving lower cost per transaction and improved merchant value proposition, with a single- entry platform for cross-border European payments Activity increased across business lines as we progress on our global platforms. Of note, Getnet TPV increase across our footprint and Ebury customer growth Open market revenue represents c.30% of Payments total revenue1 Strong profit increase, supported by 15% revenue growth and EBITDA margin expansion Revenue (€ mn) EBITDA margin (%) Profit (€ mn)Cost per payment transaction (€ cents)Operating targets Profitable growth Global platforms generating value in scope and scale, driving revenue growth and profitability improvements 9M’26 performance9M’26 execution Getnet Platforms # transactions 14bn 3x Ebury active customers 29k +25% Getnet TPV €198bn +9% 18.7 25.5 9M'25 9M'26 1,026 1,175 9M'25 9M'26 43 105 9M'25 9M'26 +15% 2x 31.6 34.0 9M'25 9M'26 +2.4pp+37% 2.4 1.5 9M'25 9M'26 -39%

17 Strong organic capital build while accelerating profitability and value creation With the buybacks against 2025 results and c.50% of the capital resulting from the Poland disposal, as well as the one against H1’26 results that is currently underway, we have delivered c.€9bn1 of our commitment of distributing at least €10bn through SBBs for 2025-26 Note: TNAVps + Cash DPS includes the €12.50 cent cash dividend per share paid in May 2026 and the €12.70 cent cash dividend per share approved in September that will be paid from 2 November 2026, all forming part of our ordinary shareholder remuneration policy against 2025 and 2026 results, respectively. M&A includes: +95bps from the Poland disposal, -56bps from the additional share buyback following the Poland disposal, -55bps from the TSB acquisition and -147bps from the Webster acquisition. Net organic generation includes: profit generation, net of ordinary capital distribution and net organic RWAs. For more information, see additional note 1 on slide 63. (1) Total share buybacks as of 9M’26 including: i) €1.7bn share buyback against H1’25 results (completed); ii) €1.8bn share buyback against H2’25 results (completed); iii) €3.2bn additional share buyback to distribute approx. 50% of the CET1 capital generated following the completion of the sale of 49% of Santander Bank Polska to Erste Group on 9 January 2026 (completed); and iv) €1.8bn share buyback against H1’26 results (underway). SBB target 2025-26 €10bn TNAVps + cash DPS € per share Cash DPS: €25.2 cents Underlying RoTECET1 % Delivered as of 9M’261 c.€9bn 5.56 5.92 6.17 Sep-25 Sep-26 16.0% 14.9% 9M'269M'25 +11%+1.1pp 11.8 12.7 -1.63 -0.09 13.5 +0.75 +0.20 Dec-25 M&A Pro forma ex. M&A Net organic generation Regulatory & models Markets, others & one-offs Sep-26 +0.9pp

Index 1 9M’26 Highlights Progress on our strategy 2 Group review 3 Final remarks 4 Appendix

19 Underlying profit € mn Underlying profit Constant € mn Higher revenue and lower costs are driving double-digit net operating income and profit growth Note: Group P&L changes are YoY. Group underlying profit excludes: i) integration charges related to M&A (-€666mn in Q2’26 and Q3’26); ii) the capital gain resulting from the disposal of the Poland business in Q1’26 (€1,895mn); and iii) results related to the business subject to the Poland disposal in 9M’25 (€713mn) Group P&L Current Constant € million 9M'26 9M'25 % % NII 34,614 31,599 10 8 Net fee income 10,349 9,462 9 7 Other income 1,844 2,182 -15 -16 Total revenue 46,807 43,243 8 7 Total costs -19,925 -19,623 2 0 Net operating income 26,882 23,620 14 12 LLPs -10,060 -8,908 13 10 Other results -1,051 -702 50 50 Underlying attributable profit 11,176 9,624 16 14 Non-recurring items 1,229 713 72 72 Attributable profit 12,405 10,337 20 18 3,165 3,212 3,247 3,528 3,560 3,768 3,848 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 3,147 3,280 3,343 3,604 3,586 3,762 3,827 +14% +19% +2% +2%

20 Revenue growth is underpinned by more customers and deeper relationships across our businesses Note: data and YoY changes in constant euros. Detail by business • In Retail, positive performances across most countries, driven by strong NII and fee growth • Openbank up, with a solid NII performance, especially in Europe and South America • CIB increased mid-teens, supported by client activity across business lines • Wealth grew double digits, up in both business lines, due to our focus on fee- generating activities and by the valuation of some stakes • Payments rose, boosted by strong activity across business lines Group • c.95% of total revenue is customer related • Solid revenue growth YoY, both in NII and fees, with all global businesses increasing, reflecting the benefits of our model • In the quarter, revenue rose 1% on the back of NII growth, mainly in Retail and Openbank, favoured by the Webster acquisition Total revenue Constant € mn YoY growth 14,481 14,754 14,692 15,382 15,283 15,658 15,866 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 46,807 -322 43,927 +1,466 +459 +840 +285 +150 9M'25 Retail Openbank CIB Wealth Payments CC 9M'26 +6% +5% +14% +10% +15% +7% +8%

21 Solid NII performances across most global businesses driven by higher activity levels and our active balance sheet management Note: data and YoY changes in constant euros. NIM = NII / Average earning assets in current euros. YoY growth Margins • 9M’26 NIM flat YoY: – Retail up 4bps, improving especially in Argentina, Spain and Mexico – Strong performances in Openbank (+13bps YoY), both in the US and Europe, as well as in CIB (+13bps YoY) • In the quarter, NIM was mainly affected by UF in Retail Chile, seasonality and change of mix in Retail Brazil and normalization in CIB (mainly in Global Markets) 2.65% 2.71% 2.61% 2.68% 2.67% 2.71% 2.60% 10,574 10,852 10,668 11,031 11,127 11,654 11,833 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 NIM Quarterly 34,614 -4 -180 32,093 +1,397 +417 +894 -3 9M'25 Retail Openbank CIB Wealth Payments CC 9M'26 NII Constant € mn +7% +5% +32% -0% -3% +11% +8% Net interest income • c.90% of Group NII is from our Retail and Openbank businesses • NII +8% YoY, with most businesses growing – Retail up 7%, with positive performances across most countries, and favoured by TSB and Webster. Excluding M&A, NII growth supported by higher volumes and balance sheet management – Openbank rose 5%, on the back of solid margin management and higher volumes in Openbank Europe and Brazil. Excluding Webster, NII +3% – CIB +32% YoY, driven by strong activity in Global Markets • In the quarter, NII +2%, benefitting from the TSB and Webster acquisitions – Retail affected by seasonality and change of mix in Brazil and UF in Chile, with generalized growth across Europe and the US – Openbank increased, mainly driven by volumes in Europe and with lower costs of deposits in the US, even excluding Webster – CIB normalizing from a strong Q2

22 10,349 9,644 +362 +133 +138 +50 +12 +10 9M'25 Retail Openbank CIB Wealth Payments CC 9M'26 Strong net fee income fuelled by structural value added from our global businesses Note: data and YoY changes in constant euros. Net fee income Constant € mn YoY growth Detail by business • Retail: – Good commercial dynamics and customer growth (+10mn YoY), supporting widespread increases across our footprint, particularly in transactional, insurance, mutual funds and FX – Of note, strong performances in Mexico, Spain, the UK and Argentina • Openbank: – Rose slightly, with solid performances in South America (activity and insurance); Openbank US was affected by strong servicing fees in 2025 • CIB: – Up 7%, on the back of strong Global Banking activity across most countries, especially in the US • Wealth: – Double-digit growth, supported by both business lines, mainly Private Banking, up 13%, driven by mutual funds in Spain and securities in the US • Payments: – Solid growth, boosted by activity in Getnet and Ebury, with Getnet TPV up 9%, mainly driven by Brazil, Europe and Mexico 3,179 3,218 3,246 3,543 3,389 3,482 3,478 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 +8% +1% +7% +11% +6% +7% +7%

23 ONE Transformation is delivering lower costs and 12% net operating income growth Note: data and YoY changes in constant euros. Contribution to Group costs as a percentage of total operating areas, excluding the Corporate Centre. Total cost growth in real terms defined as cost growth in constant euros, excluding inflation and perimeter effects from significant M&A transactions (i.e. TSB and Webster). RETAIL AND OPENBANK GROUP Costs • Costs down 5% YoY in real terms, with efficiency improving 3pp – Retail down 5% ex. M&A, with outstanding performances in the UK and Spain – Openbank improved 5% ex. Webster, driven both by Europe and the US – CIB +5%, well below revenue growth, resulting in +8pp operating jaws – In Wealth, efficiency improved 2pp to 34.6% – In Payments, up as we invest in our global platforms, in a context of higher activity • In the quarter, costs -4% ex. M&A, with significant savings in Retail and Openbank 46.5% 46.7% 45.9% 45.3% 44.5% 43.8% 43.2% Revenue Constant € mn Total costs Constant € mn Efficiency 12M rolling NOI Constant € mn 7,877 8,033 8,151 8,461 8,739 8,949 9,194 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 6,604 6,721 6,541 6,921 6,544 6,710 6,672 +12% 14,481 14,754 14,692 15,382 15,283 15,658 15,866 +7% 0% -5% in real terms Retail and Openbank represent c.75% of the Group’s total costs Retail Openbank Revenue Constant € mn Total costs Constant € mn Efficiency 43.0% 40.1% 34,413 36,339 9M'25 9M'26 14,786 14,563 9M'25 9M'26 +6% -2% in real terms -8%

24 Robust asset quality Note: data and YoY changes in constant euros. CoR, NPL ratio, Coverage ratio and Stages in current euros. CoR – underlying provisions to cover losses due to impairment of loans in the last 12 months / average loans and advances to customers and debt securities issued by non-financial institutions over the last 12 months. Detail by business • In Retail, which represents >60% of Group LLPs, CoR was affected by Argentina. Excluding it, CoR was 1.08%, fairly stable both YoY and QoQ – Of note, solid underlying performance YoY in Spain (-17bps) and sound improvement in Brazil as we adjust our portfolio mix (-15bps) • In Openbank, which represents >30% of Group LLPs, CoR rose 4bps to 2.10% YoY (broadly stable QoQ) – In Openbank Europe, CoR affected by model updates and Openbank Pay growth – In Openbank US, CoR down 25bps YoY (-15bps QoQ), reflecting resilient customer behaviour and improved mix (personal lending portfolio sale in 2025) • In CIB, LLPs affected by single names in Europe, Brazil and the US CoR LLPs Constant € mn 1.12% 1.13% 1.13% 1.14% 1.14% 1.15% 1.16% Sep-25 Jun-26 Sep-26 NPL ratio 2.91% 2.93% 2.90% Coverage ratio 67% 64% 64% Stage 1 €982bn €1,090bn €1,155bn Stage 2 €83bn €93bn €95bn Stage 3 €33bn €38bn €39bn Other credit quality metrics 3,081 3,083 2,960 3,297 3,268 3,329 3,463 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 +10% Credit quality • LLPs and CoR affected YoY by sector-wide trends in Argentina. Excluding Argentina: – LLPs rose 6%, in line with loan growth ex. M&A, and CoR was broadly stable at 1.09%, reflecting our active risk management and resilient labour markets across most of our footprint – NPL ratio improved to 2.85%. Even excluding M&A and after some single-name impacts, it remained at low levels • Stable coverage ratio in the quarter; YoY trends reflect changing portfolio mix. Stages growing in line with portfolio, with a stable distribution across buckets

25 Strong organic capital generation keeps us on track to deliver on our year-end CET1 target Front book pricing RoTE of new book Asset rotation and risk transfer activities Capital generated Value creation % RWAs with RoRWA > CoE Maximize capital productivity Note: phased-in ratio calculated in accordance with the transitory treatment of the CRR. (1) Capital distribution includes deductions for accrual of ordinary shareholder remuneration and AT1 costs. The board of directors intends to: i) apply an ordinary shareholder remuneration policy for 2026 to 2028 results that entails distributing approximately 50% of the Group’s underlying profit (excluding non-cash, non-capital ratios impact items), split approximately evenly between cash dividends and share buybacks for 2026 results; and ii) distribute any excess capital to shareholders at the end of the 2026-2028 period. From 2027 results, the ordinary shareholder remuneration policy is expected to comprise around 35% of the Group's underlying profit (on the same basis) in cash dividends and around 15% in share buybacks. The execution of the ordinary shareholder remuneration policy and the distribution of any excess capital to shareholders at the end of the 2026- 2028 period is subject to corporate and regulatory decisions and approvals. (2) Business RWA change net of risk transfer initiatives. CET1 ratio % 9M’26 or latest estimates c.€4.5bn 21% 90% 12.5 12.7 -1.47 -0.33 -0.07 -0.04 -0.01 14.0 +0.59 Jun-26 Webster Pro forma ex. Webster Profit Ordinary capital distribution¹ Net organic RWAs² Regulatory & models Markets, one- offs & others Sep-26 2026 target 12.8-13% +19bps net organic generation +75bps net organic generation in 9M’26

Index 1 9M’26 Highlights Progress on our strategy 2 Group review 3 Final remarks 4 Appendix

27 Record 9M profit and comfortably on track to meet all our 2026 targets Note: YoY changes in constant euros. Targets market dependent. Based on macro assumptions aligned with international economic institutions. P&L targets excluding Poland, TSB and Webster in 2025-26, as defined during the Investor Day in February 2026. TNAVps + Cash DPS includes the €12.50 cent cash dividend per share paid in May 2026 and the €12.70 cent cash dividend per share approved in September that will be paid from 2 November 2026, all forming part of our ordinary shareholder remuneration policy against 2025 and 2026 results, respectively. 2026 targets9M’26 delivery Revenue and costs on track on the back of our consistent execution of ONE Transformation Strong quarterly profit supported by a solid P&L from top to bottom Capital on track to achieve 2026 target with a solid organic capital build Double-digit shareholder value creation driven by disciplined capital allocation Mid-single digit in constant eurosex. TSB & Webster Down in constant euros ex. TSB & Webster Up vs. €14.1bn in 2025 ex. TSB & Webster 12.8-13% Operating range: 12-13% At least double digit +5% 12.7% +11% Revenue growth Costs Underlying profit CET1 TNAVps + Cash DPS -2% €11.0bn

28 Our Financial North Star Note: the board of directors intends to: i) apply an ordinary shareholder remuneration policy for 2026 to 2028 results that entails allocating approximately 50% of the Group’s underlying profit (excluding non-cash, non-capital ratios impact items), split approximately evenly between cash dividends and share buybacks for 2026 results; and ii) distribute any excess capital to shareholders at the end of the 2026-2028 period. From 2027 results, the ordinary shareholder remuneration policy is expected to comprise around 35% of the Group's underlying profit (on the same basis) in cash dividends and around 15% in share buybacks. The execution of the ordinary shareholder remuneration policy and the distribution of any excess capital to shareholders at the end of the 2026-2028 period is subject to corporate and regulatory decisions and approvals. (1) vs. 2025. 2026 – 28 targets Reinvesting capital organically >20% RoTEIncrease cash dividend payout to 35% from 2027 Shareholder remuneration 50% Payout >x2 by 20281 Cash DPS TNAVps+DPS Accelerating to High teens by 2028 EPS annual growth Double-digit 2026-2028 & Profitable growth >20% RoTE by 2028 >€20bn Profit Strength c.13% CET1 12-13% operating range Excess >13% to be returned at the end of the plan

Index 1 9M’26 Highlights Progress on our strategy 2 Group review 3 Final remarks 4 Appendix

2028 Investor Day targets summary Group P&L QoQ variations including and excluding M&A Loans by global business Detail by global business Detail by country Balance sheet and capital management Reconciliation of underlying results to statutory results Glossary and additional notes Appendix

31 We are well positioned to deliver on our 2028 Investor Day targets (1) The board of directors intends to: i) apply an ordinary shareholder remuneration policy for 2026 to 2028 results that entails allocating approximately 50% of the Group’s underlying profit (excluding non-cash, non-capital ratios impact items), split approximately evenly between cash dividends and share buybacks for 2026 results, and ii) distribute to shareholders any excess capital at the end of the 2026-2028 period. From 2027 results, the ordinary shareholder remuneration policy is expected to comprise around 35% of the Group's underlying profit (on the same basis) in cash dividends and around 15% in share buybacks. The execution of the ordinary shareholder remuneration policy and the distribution to shareholders of any excess capital at the end of the 2026-2028 period is subject to corporate and regulatory decisions and approvals. (2) In constant euros based on 2025 FX rates. (3) YoY changes in constant euros and like for like (i.e. excluding Poland in 2025 and TSB/Webster perimeter effects). 2025 9M'26 2028 ID targets Underlying profit (€ bn) 13.2 11.2 >€20bn Underlying RoTE (%) 15.2 16.0 >20% Underlying EPS (%) 17 21 DD annual growth Payout (Cash + SBB)¹ (%) 50 50 50 Total customers (mn) 174 189 >210mn Active customers (mn) 102 111 c.125mn Fees per active customer (constant €²) 130 129 c.135 Cost per active customer (constant €²) 264 249 c.220 Total revenue (%) 5 5 Up MSD every year³ Total costs (%) 0 -2 <€27bn² | Down every year³ Efficiency ratio (%) 45.3 42.6 c.36% CET1 (%) 13.5 12.7 c.13% RoTE of new business (%) 22 21 >20% Value creation TNAVps + cash DPS (%) +14 +11 Accelerating to high teens Capital Profitability Customers ONE Transformation

33 Quarterly trends impacted by seasonal effects Group quarterly performance excluding TSB & Webster Constant € mn 3,081 3,083 2,960 3,297 3,268 3,314 3,407 Q1'25 Q2 Q3 Q4 Q1'26 Q2 Q3 6,604 6,721 6,541 6,921 6,544 6,577 6,340 NII Fees Revenue Costs LLPs 14,481 14,754 14,692 15,382 15,283 15,430 15,196 3,179 3,218 3,246 3,543 3,389 3,467 3,421 10,574 10,852 10,668 11,031 11,127 11,439 11,220 -2% -1% -2% -4% +3% Q3'26 vs. Q2'26 Current Constant Current Constant % % % % NII 2 2 -2 -2 Net fee income 0 -0 -1 -1 Other income 7 6 7 6 Total revenue 2 1 -1 -2 Total costs -0 -1 -3 -4 Net operating income 3 3 0 0 LLPs 4 4 3 3 Other results 7 7 -10 -10 Underlying attributable profit 2 2 -1 -1 Group P&L Ex. TSB & Webster

35 61% 20% 16% 3% €1,143bn Loans +16% +7% +28% Loans by global business Retail Openbank CIB Wealth +16% Note: data and YoY changes in constant euros. Total loans includes €1bn from Payments, not represented in the graph as it is not material, just 0.1% of the total Group. +3% ex. M&A ex. Webster +3% o/w M&A +6% ex. M&A Loans • >80% of Group loan portfolio is from our Retail and Openbank businesses • Loans rose 16% YoY, favoured by the incorporation of TSB and Webster. Excluding M&A, they increased 6%: – In Retail, loans +3%, on the back of widespread growth in mortgages, particularly in Europe and Brazil, cards, especially in Select customers in Brazil, and corporate loans – In Openbank, they went up 3%, driven by auto, with sustained growth in Europe, and double-digit increases across most of our countries in Latin America – In CIB, +28%, boosted by growth across business lines, especially in less capital-intensive products – In Wealth, 11% increase, particularly in Spain, Chile (boosted by the Principal Vida Chile acquisition) and the US +13% ex. Webster +11%

37 Retail & Commercial Banking Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. HIGHLIGHTS • ONE Transformation continued to deliver tangible results, reflected in fee growth, a double-digit increase in customer funds, cost to serve improvement (-5%) and higher profitability • Excluding M&A, loans increased 3% YoY, mainly driven by mortgages across countries, deposits grew 6% and mutual funds +14% • Strong profit growth YoY (+9% ex. M&A), on the back of higher revenue and strong cost reductions. By line: − NII increased, with positive performances across most of our footprint, boosted by higher volumes and active balance sheet management − Fees +8%, driven by transactional, insurance, mutual funds and FX − Costs improved 8% in real terms, benefitting from our transformation. As a result, efficiency improved 2.9pp to 39.9% − LLPs increased due to higher provisions in Argentina, reflecting sector-wide trends in the country. Excluding it, LLPs up 2% • Excluding M&A, profit +7% QoQ, mainly driven by fees (transactional), as well as lower regulatory charges and costs (transformation), which more than offset the impact on NII of the UF in Chile and the seasonality and portfolio mix change in Brazil Loans €697bn +16% Deposits €711bn +16% CoR 1.20% +6bps Efficiency 39.9% -2.9pp RoTE 17.7% +1.0pp Mutual funds €125bn +14% KEY DATA Ex. M&A Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 7,528 1.9 -1.7 21,687 6.9 9.6 3.5 6.1 Net fee income 1,756 3.4 2.4 5,084 7.7 11.1 6.7 10.0 Total revenue 9,141 3.1 0.1 26,277 5.9 8.7 3.0 5.7 Total costs -3,549 -1.5 -4.7 -10,497 -1.1 1.3 -4.6 -2.3 Net operating income 5,592 6.3 3.2 15,780 11.2 14.2 8.7 11.6 LLPs -2,097 1.0 -1.0 -6,119 8.9 13.7 7.6 12.3 Underlying profit 2,321 9.5 6.6 6,445 12.5 14.4 9.5 11.4 Ex. M&A ex. M&A ex. M&A +3% P&L +6%

38 • Loans up YoY, mainly mortgages, personal loans (Select) and corporates. Depositsrose 5%, boosted by Select, and mutual funds +13% • Strong performance across the P&L (PBT +29% YoY) with higher NII (activity and balance sheet management) and fees (FX and insurance), costs down and lower LLPs, driven by balance sheet optimization and better credit quality • In the quarter, PBT mainly affected by LLP normalization after Q2 balance sheet optimization initiatives, which more than offset a solid NII performance • Ex. TSB, loans up YoY, supported by positive new business trends since Jun-25, and deposits rose, mainly time deposits from individuals • Ex. TSB, PBT+27% YoY, driven by higher NII (volumes and mortgage yields), transactional fees and lower costs (transformation), partially offset by LLPs (model updates and balance sheet optimization), remaining at low levels • Ex. TSB, PBT +45% QoQ, with strong performances across the P&L, especially in NII (volumes and yields), costs and LLPs (balance sheet optimization) Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. RETAIL UKRETAIL SPAIN Loans €159bn +2% Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 NII 1,579 2.0 4,604 4.3 Net fee income 326 -1.6 1,001 8.4 Total revenue 1,924 -1.3 5,781 7.1 Total costs -599 0.1 -1,806 -7.5 Net operating income 1,325 -1.9 3,975 15.4 LLPs -269 44.1 -573 -27.6 Profit before tax 991 -7.2 3,220 29.1 Deposits €240bn +5% Mutual funds €55bn +13% Yield on loans 3.47% -15bps Cost of deposits 0.47% -1bps Efficiency 31.2% -4.9pp Loans €277bn +22% Deposits €263bn +25% Mutual funds €8bn +30% Yield on loans 4.21% +3bps Cost of deposits 1.92% -0bps Efficiency 51.0% -8.6pp ex. TSB ex. TSB +3% +5% Ex. TSB Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 1,636 13.4 6.1 4,272 19.2 17.4 4.0 2.4 Net fee income 119 15.2 9.3 302 42.0 39.9 24.7 22.8 Total revenue 1,699 15.8 9.5 4,335 22.5 20.7 6.4 4.8 Total costs -795 3.0 -5.5 -2,211 4.9 3.3 -10.4 -11.8 Net operating income 904 30.0 25.4 2,123 48.5 46.3 31.2 29.3 LLPs -71 -39.3 -48.7 -262 123.6 120.3 94.5 91.7 Profit before tax 761 44.5 44.5 1,699 43.5 41.3 26.9 25.0 Ex. TSB

39 • Loans up YoY in mortgages, personal loans and corporates. Depositgrowth reflects our focus on becoming our customers’ primary bank • PBT +6% YoY, driven by NII (cost of deposits, volumes and active balance sheet management), fees (transactional and insurance) and costs, partially offset by higher LLPs (model updates and single names in Commercial) • PBT +12% QoQ, on the back of revenue growth, mainly from transactional fees, and lower costs and LLPs (model updates in cards) • Loans flat YoY as the increase in corporates, mortgages and cards (Select) offset the decrease in personal loans, in line with our derisking strategy. Deposits+10%, backed by time deposits, and mutual funds up double digits • PBTaffected YoY by the impact on NII of a shift towards a lower-risk portfolio. Costs down in real terms with flat LLPs, reflecting the portfolio mix change • PBT +16% QoQ, driven by higher fees (transactional and insurance) and GFT (FX hedge), with lower costs (transformation and legal) and LLPs Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. RETAIL BRAZILRETAIL MEXICO Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 1,072 -0.9 3,142 0.9 8.8 Net fee income 293 5.3 822 15.7 24.9 Total revenue 1,361 3.0 3,912 4.1 12.4 Total costs -529 -0.7 -1,551 -2.6 5.0 Net operating income 832 5.5 2,361 9.1 17.8 LLPs -346 -0.6 -1,025 11.0 19.7 Profit before tax 485 12.3 1,318 6.2 14.6 Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 1,838 -6.0 5,632 -1.0 4.6 Net fee income 584 3.5 1,683 -1.4 4.2 Total revenue 2,356 -2.2 7,093 -2.1 3.4 Total costs -974 -9.4 -3,060 -0.3 5.4 Net operating income 1,381 3.6 4,033 -3.5 2.0 LLPs -1,013 -1.3 -3,001 -0.5 5.2 Profit before tax 327 16.2 961 -16.9 -12.2 Loans €40bn +3% Deposits €40bn +6% Mutual funds €17bn +4% Yield on loans 13.16% -126bps Cost of deposits 2.87% -89bps Efficiency 39.6% -2.8pp Loans €70bn -0% Deposits €68bn +10% Mutual funds €29bn +18% Yield on loans 15.99% -36bps Cost of deposits 9.41% +39bps Efficiency 43.1% +0.8pp

40 Openbank Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. (2) The additional provisions in 9M’26 in UK auto finance (Motor Finance) were €245mn gross, €194mn net of tax and non-controlling interest, booked in Q1’26 and Q2’26. HIGHLIGHTS • We aim to become a leading digital bank that combines advanced technology with a personal and human touch, placing customers at the heart of our management and maximizing profitability and shareholder value • Excluding Webster, loans +3% YoY, with good performances in auto, and deposits +2% YoY, supported by our digital bank, in line with our strategy to optimize funding costs • Profit was impacted by Motor Finance2, the integration of Webster and a normalizedtax rate following the end of EV fiscal incentives in the US in 2025 • Excluding Motor Finance and Webster, PBT increased 11% YoY: – Revenueup 3%, mainly driven by NII growth (margin management and volumes), higher fees in South America (volumes and insurance activity) and leasing in Europe, partially offset by softer revenue trends in the US – Costsdown 5%, backed by our transformation efforts and lower asset impairments and operational risk charges (including those linked to CHFs) – LLPs increased 5%, with a good performance in the US that partially offset increases in other units, mainly in Europe and Brazil • Excluding Webster, NOI rose 7% QoQ, largely due to favourable NII, leasing in Europe and lower costs. Profit mainly affected by the usual LLP seasonality in the US KEY DATA P&L Loans €231bn +7% Deposits €177bn +37% CoR 2.10% +4bps Efficiency 40.4% -3.1pp RoTE 9.0% -1.3pp ex. Webster ex. Webster +3% +2% Ex. Webster Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 3,015 6.7 1.9 8,625 5.1 4.3 3.5 2.7 Net fee income 359 4.4 -2.4 1,073 1.0 1.2 -1.2 -1.0 Total revenue 3,527 7.2 2.0 10,062 4.8 4.1 3.0 2.3 Total costs -1,347 1.3 -5.5 -4,066 -2.5 -3.4 -4.7 -5.5 Net operating income 2,180 11.3 7.2 5,997 10.4 9.8 8.9 8.4 LLPs -1,179 14.1 14.3 -3,263 4.6 3.8 4.6 3.8 Underlying profit 580 7.7 -1.8 1,407 -9.3 -9.9 -12.6 -13.1 Ex. Webster New lending €67bn +9%

41 Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. (2) The additional provisions in 9M’26 in UK auto finance (Motor Finance) were €245mn gross, €194mn net of tax and non-controlling interest, booked in Q1’26 and Q2’26. • Loans increased YoY, underpinned by auto growth. Deposit trends reflect our focus on profitability in a highly competitive environment • PBT heavily impacted by Motor Finance2. Excluding it, PBT +9% YoY, with strong performances in NII (margin management and volumes), leasing (new business trends) and lower costs (efficiencies and lower operational risk charges) • PBT +10% QoQ, on the back of a strong NOI performance, mainly driven by NII (volumes), leasing results and lower costs • Ex. M&A, loans reflected our asset rotation initiatives and focus on auto profitability, while deposits posted solid growth, supported by our digital bank • Ex. M&A, PBT +35% YoY, underpinned by notable improvements in costs (efficiencies and lower asset impairment charges) and LLPs (resilient customer repayment behaviour and capital relief measures) • Ex . M&A, NOI up 12% QoQ,mainly driven by strong NII performance with lower deposit costs, and cost dynamics. PBT affected by the usual LLP seasonality OPENBANK USOPENBANK EUROPE Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 1,230 1.7 3,645 4.4 5.0 Net fee income 183 -6.2 568 -0.5 -0.5 Total revenue 1,554 3.6 4,543 4.5 4.9 Total costs -650 -2.0 -2,020 -7.1 -6.9 Net operating income 904 8.0 2,523 16.2 16.7 LLPs -349 0.8 -1,038 11.9 12.1 Profit before tax 474 9.7 1,090 -10.8 -10.1 Loans €147bn +3% Deposits €80bn -3% Mutual funds €6bn +15% Yield on loans 5.75% -2bps Cost of deposits 1.64% -27bps Efficiency 44.5% -5.6pp Loans €60bn +19% Deposits €96bn +107% Mutual funds €4bn +4% Yield on loans 11.79% -24bps Cost of deposits 2.14% +1bps Efficiency 40.1% -2.0pp ex. Webster ex. Webster -1% +9% Ex. Webster Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 1,273 15.0 2.8 3,462 3.4 -0.6 -0.6 -4.4 Net fee income 94 43.7 7.8 242 -3.7 -7.3 -13.0 -16.3 Total revenue 1,413 16.0 1.8 3,819 2.7 -1.2 -1.9 -5.6 Total costs -522 5.6 -12.8 -1,530 -2.1 -5.8 -7.9 -11.3 Net operating income 891 23.0 11.8 2,289 6.2 2.2 2.5 -1.4 LLPs -511 31.9 32.3 -1,338 -9.1 -12.6 -9.0 -12.4 Profit before tax 355 3.9 -13.0 923 43.5 38.1 34.6 29.6 Ex. Webster

42 Corporate & Investment Banking Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. HIGHLIGHTS • Solid execution of our strategy, driving RoTEup to 19.2% and maintaining a leading position in efficiency • Good activity levels reflect the benefits of our growth initiatives and the resilience of our diversified business model. By business line: – In Global Transaction Banking (GTB), activity grew mainly in Export Finance and Trade & Working Capital Solutions – In Global Banking (GB), strong momentum in Corporate Finance and Debt Finance, mainly in the US, and in Structured Finance – In Global Markets (GM), good performance, especially in the US and LatAm, supported by client-driven activity, both in Fixed Income, Currenciesand Commodities (FICC) and in Equity products • Loans increased strongly YoY, driven by growth in less capital-intensive products, especially in Global Transaction Banking and Global Markets. Depositsgrew mainly in Cash Management • Profit +15% YoY, with solid revenue performances across business lines, growing well above costs, which more than offset the impact of single names in Europe, Brazil and the US • In the quarter,profit reflects the usual revenue seasonality in Q3 after a strong Q2, with lower provisions and controlled costs KEY DATA P&L Loans €178bn +28% Deposits €150bn +12% Efficiency 42.6% -3.8pp CoR 0.32% +24bps RoTE 19.2% +0.7pp Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 1,189 -10.9 3,732 31.5 34.1 Net fee income 641 -12.0 1,995 7.1 7.4 Total revenue 2,157 -10.4 6,936 13.8 15.1 Total costs -1,008 0.0 -2,956 5.4 5.7 Net operating income 1,149 -17.9 3,980 20.9 23.2 LLPs -194 -18.5 -638 303.8 308.4 Underlying profit 691 -19.4 2,433 15.0 17.0

43 Wealth Management & Insurance Note: Sep-26 data and YoY changes in constant euros. (1) Annualized YTD net new money as a % of PB’s 2025 customer assets and liabilities (CAL). Annualized YTD net sales as a % of AM’s 2025 AuMs. (2) % change in current euros. (3) Includes all fees generated by Insurance & Asset Management Solutions, even distribution fees recorded in other businesses. HIGHLIGHTS • We continue to build the best wealth and insurance manager in Europe and the Americas, supported by our leading global private banking platform and our funds and insurance factories • AuMs increased 11% YoY to €588bn, new record levels, on the back of solid commercial activity and a favourable market performance. GWPs rose 20% YoY, with both Life & Pensions and Protection growing at double digits • High-teen profit growth YoY, supported by revenue across business lines. Of note, strong fee performance, both in PB and Insurance & AM Solutions, driven by higher client activity and AuMs • Solid growth in total fee contribution3 and total contribution to Group profit3 (+10% and +14% YoY, respectively) • Efficiencyimproved YoY to 34.6% and RoTEwas 58.2% • In the quarter, NOI slightly up, with solid fee growth across business lines and higher GFT in I&AMS (illiquids). Profit affected by LLP normalization and restructuring charges related to our transformation KEY DATA P&L Gross written premiums Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25² NII 335 -1.7 990 -0.4 -0.4 Net fee income 456 2.9 1,354 11.4 11.7 Total revenue 1,105 0.8 3,198 9.8 10.4 Total costs -375 1.8 -1,107 4.2 4.2 Net operating income 730 0.3 2,090 13.0 14.1 LLPs -13 — -19 92.7 97.8 Underlying profit 568 -4.1 1,651 18.8 19.9 Contribution to profit 1,018 -0.6 2,968 14.0 16.3 AuMs €588bn +11% Net new money (PB) €17.2bn 6% of volumes¹ Net sales (AM) €7.9bn 4% of volumes¹ Efficiency 34.6% -2.1pp RoTE 58.2% -0.6pp €10.0bn +20%

44 Payment Solutions Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. HIGHLIGHTS • Payment Solutions is positioned as our payments platform business, structured around three business lines: – Getnet, our acquiring business – Getnet Platforms, consisting of our A2A platform and our card processing platform – Ebury, our global platform offering cross-border payments and FX solutions for corporates and SMEs • We are on track with our key strategic priorities to deliver higher profitability by combining growth and scale through our global platforms, resulting in a 39% reduction in the cost per transaction YoY • Solid growth across our business lines with activity increasing YoY: – Getnet TPV up 9% driven mainly by higher commercial activity in Brazil, Europe and Mexico – Processed transactions in GetnetPlatforms3x vs. 9M’25, driven by Brazil – Ebury’s active customers rose 25%, supported by commercial expansion • Profit 2x higher than 9M’25 driven by 15% revenue growth, resulting in a 2.4pp increase in EBITDA margin YoY to 34.0% • In the quarter, NOI up 22%, driven by a strong revenue performance, growing above costs. Profit affected by the normalization of the tax burden in Brazil KEY DATA P&L Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 42 15.6 124 -2.7 2.1 Net fee income 290 0.1 853 6.3 9.7 Total revenue 404 4.5 1,175 14.6 18.2 Total costs -343 1.8 -1,000 7.7 10.0 Net operating income 62 22.2 175 79.6 106.8 LLPs -4 -37.0 -24 22.2 26.0 Underlying profit 27 -54.8 105 147.4 200.9 Ebury – active customers Getnet – TPV Getnet Platforms – # transactions EBITDA margin 34.0% +2.4pp €198bn +9% 14bn 3x 29k +25%

45 • NII impactedby higher funding costs and lower interest rates • Greater loss on financial transactions, affected by FX hedges • Other operating incomeimproved on the back of higher results from some stakes and dividends from our stake in Poland • Total costs increased by €13mn in the period • Strong LLP improvement, following the provisions recorded in 9M’25, in line with our NPL reduction plan • As a result, underlying attributable loss improved following operational risk charges in Q3’25 and benefittingfrom a more favourable tax burden Corporate Centre HIGHLIGHTSP&L Underlying P&L (€ mn) 9M'26 9M'25 NII -544 -364 Gains / losses on financial transactions -704 -135 Total costs -298 -285 LLPs and other results -85 -449 Tax and minority interests 359 195 Underlying profit -865 -1,059

47 Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. • Loansincreased YoY, mainly in CIB. Deposits, both time and demand, grew across most global businesses. Mutual funds rose 13% • Profit +14% YoYon the back of 8% NII growth (volumes and balance sheet management), fee performance (transactional and mutual funds) and lower costs, with LLPs affected by single names in CIB • QoQ, revenue and costs affected by seasonality in CIB. In Retail, NII up 2% (balance sheet management) with flat costs • Ex. TSB, loans up 3% YoY, driven by positive new business trends since Jun-25, and depositsrose 4%, mainly time deposits from individuals • Profit +22% YoY ex. TSB, driven by higher NII (volumes and yields), transactional fees and lower costs (transformation), partially offset by LLPs (model updates and balance sheet optimization), remaining at low levels • Ex. TSB, profit +34% QoQ, with strong performances across the P&L, especially in NII (volumes and yields), costs and LLPs (balance sheet optimization) Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 NII 1,967 -1.7 5,827 7.6 Net fee income 774 -6.0 2,363 6.8 Total revenue 3,132 -3.0 9,512 5.9 Total costs -1,099 3.4 -3,242 -2.7 Net operating income 2,033 -6.1 6,271 11.0 LLPs -326 -1.5 -917 9.1 Underlying profit 1,161 -7.0 3,695 14.3 Loans €256bn +10% Deposits €331bn +6% Mutual funds €117bn +13% Efficiency 34.1% -3.0pp CoR 0.43% -2bps RoTE 25.6% +5.1pp Loans €279bn +21% Deposits €270bn +23% Mutual funds €8bn +6% Efficiency 50.6% -8.0pp CoR 0.12% +9bps RoTE 12.8% +2.8pp UKSPAIN Ex. TSB Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 1,660 13.0 5.9 4,347 17.3 15.5 2.5 1.0 Net fee income 133 12.5 7.1 342 34.1 32.2 19.7 17.9 Total revenue 1,738 15.3 9.1 4,450 20.1 18.3 4.7 3.2 Total costs -808 2.7 -5.6 -2,252 3.7 2.1 -11.2 -12.5 Net operating income 930 28.9 24.4 2,198 43.4 41.3 27.3 25.4 LLPs -71 -39.3 -48.7 -262 123.6 120.3 94.5 91.7 Underlying profit 557 35.9 33.8 1,282 35.8 33.8 21.5 19.7 Ex. TSB ex. TSB ex. TSB +3% +4%

48 Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. • Loansrose YoY mainly in Retail and CIB. Deposits up, particularly in Retail, and mutual funds grew 7% • Profit YoY affected by strong performances in 9M’25 of revenue (regulatory charge reimbursement) and LLP (loan recovery), partially offset by transactional and advisory fees, costs (transformation) and tax. Excellent RoTE at 29.8% • Profit +9% QoQ, with NOI up 12% driven by higher revenue, on the back of higher yields and benefitting from regulatory charges in Q2, and cost control PORTUGAL Loans €43bn +5% Deposits €43bn +6% Mutual funds €6bn +7% Efficiency 28.1% +0.8pp CoR 0.06% +6bps RoTE 29.8% -0.7pp Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 NII 335 0.6 1,008 -0.5 Net fee income 127 -4.7 393 4.0 Total revenue 482 8.8 1,419 -3.5 Total costs -133 0.5 -399 -0.6 Net operating income 349 12.3 1,021 -4.6 LLPs -10 5.6 -32 — Underlying profit 241 9.0 712 -6.9 US • Ex. M&A, loans+13% YoY, with strong growth in CIB, deposits +12%, backed by increases in CIB and Openbank. Mutual funds+14% • Ex. M&A, profit +24% YoY, despite tax rate normalization after the end of EV fiscal benefits, mainly driven by solid performances in revenue (activity in CIB and Wealth), costs (partly efficiencies) and LLPs (Openbank) • Ex. M&A, NOI +2% QoQ, driven by solid NII, with lower cost of deposits, and total costs. Profit reflects the usual LLP seasonality in Openbank Loans €175bn +59% Deposits €158bn +84% Mutual funds €18bn +14% Efficiency 44.7% -4.6pp CoR 1.39% -24bps RoTE 12.6% +2.1pp ex. Webster ex. Webster +13% +12% Ex. Webster Underlying P&L (€ mn) Q3'26 % Q2'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ % 9M'25 % 9M'25¹ NII 1,808 21.5 2.4 4,717 11.1 6.9 4.5 0.5 Net fee income 403 3.3 -5.6 1,158 18.7 14.2 15.2 10.9 Total revenue 2,367 15.6 -0.5 6,371 13.1 8.8 7.2 3.2 Total costs -1,018 12.5 -3.3 -2,851 2.6 -1.3 -2.5 -6.2 Net operating income 1,349 18.1 1.7 3,520 23.3 18.6 16.7 12.3 LLPs -635 47.6 38.8 -1,528 -0.6 -4.3 -3.0 -6.7 Underlying profit 525 -7.3 -23.1 1,514 31.8 26.8 24.1 19.4 Ex. Webster

49 Note: Sep-26 data and YoY changes in constant euros. (1) % change in current euros. MEXICO BRAZIL • In loans, solid growth in corporates, mortgages, cards (Select) and auto offset lower personal loans. Deposits up 8%, driven by time deposits. Mutual funds also performed well • Profit YoY impacted by GFT and LLPs (single names in CIB and volumes in Openbank) in a challenging environment, with costs -3% in real terms • In the quarter, profit affected by seasonality and a shift towards a lower- risk portfolio in NII and tax rate normalization, with a strong cost reduction Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 2,462 -5.2 7,530 1.0 6.8 Net fee income 809 -0.5 2,425 -2.4 3.2 Total revenue 3,191 -3.8 9,786 -1.6 4.0 Total costs -1,252 -9.2 -3,921 1.1 6.8 Net operating income 1,939 0.0 5,864 -3.3 2.3 LLPs -1,271 0.9 -3,707 5.5 11.5 Underlying profit 504 -8.0 1,596 -5.0 0.4 Loans €100bn +0% Deposits €95bn +8% Mutual funds €62bn +7% Efficiency 40.1% +1.0pp CoR 4.25% +8bps RoTE 13.9% -1.2pp • Loans +11% YoY, with increases across most businesses, especially in CIB. Deposits +8% YoY, supported by broad-based growth, mainly in Retail • Profit +7% YoY,driven by NOI (+11%), reflecting higher NII (cost of deposits, volumes and balance sheet management), fees (transactional and insurance) and lower costs, with LLPs up (mainly model updates) and a higher tax burden • Profit +4% QoQ, underpinned by revenue growth, due to higher transactional fees and the contribution from an equity stake, with costs under control Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 1,287 -2.4 3,789 4.4 12.6 Net fee income 432 4.7 1,236 11.1 19.9 Total revenue 1,809 1.3 5,221 6.0 14.4 Total costs -717 -0.5 -2,105 -0.9 7.0 Net operating income 1,092 2.4 3,116 11.2 20.0 LLPs -382 2.5 -1,106 10.1 18.8 Underlying profit 505 4.4 1,402 7.3 15.8 Loans €53bn +11% Deposits €48bn +8% Mutual funds €25bn +4% Efficiency 40.3% -2.8pp CoR 2.73% +11bps RoTE 21.2% +0.0pp

50 Note: Sep-26 data and YoY changes in constant euros. Argentina in current euros. (1) % change in current euros. • Customer increase of 8% YoY supported loan growth across businesses. Deposits up, driven by time deposits. Mutual fundsgrew double digits • Profit up 20% YoY, boosted by NII (volumes, UF and cost of deposits) and lower IT costs, with LLPs slightly down • In the quarter, profit impacted by lower UF, with solid cost and risk management • Loans grew 16% YoY, with double-digit growth in Retail, mainly cards and mortgages, and in CIB. Deposits up 18% in a competitive environment • NOI rosedouble digits YoY, driven by NII (mainly securities), fees (cards and mutual funds) and costs growing well below inflation. Profit impacted by LLPs mainly in Retail, reflecting sector-wide trends, with early signs of stabilization • QoQ, profit boosted by fee growth across most businesses, cost control and lower LLPs, on the back of better performances in Retail and Openbank CHILE ARGENTINA Loans €43bn +10% Deposits €31bn +20% Mutual funds €14bn +10% Efficiency 31.1% -3.2pp CoR 1.28% -4bps RoTE 20.3% +0.9pp Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 % 9M'25¹ NII 487 -17.5 1,579 8.1 9.8 Net fee income 128 -9.4 434 -0.8 0.7 Total revenue 674 -14.3 2,212 6.8 8.4 Total costs -230 0.2 -688 -3.2 -1.7 Net operating income 444 -20.2 1,524 11.9 13.6 LLPs -137 -3.9 -421 -0.3 1.2 Underlying profit 178 -28.9 648 19.5 21.4 Underlying P&L (€ mn) Q3'26 % Q2'26 9M'26 % 9M'25 NII 529 -5.9 1,691 34.5 Net fee income 251 8.0 702 20.9 Total revenue 692 -2.2 2,047 23.8 Total costs -269 5.7 -787 7.1 Net operating income 423 -6.7 1,260 37.1 LLPs -217 -18.1 -809 112.1 Underlying profit 147 3.5 341 -2.1 Loans €11bn +16% Deposits €12bn +18% Mutual funds €8bn +41% Efficiency 38.5% -6.0pp CoR 10.80% +455bps RoTE 16.1% -5.4pp

52 Santander’s capital levels amply exceed minimum regulatory requirements * Phased-in ratios are calculated in accordance with the transitory treatment of the CRR. (1) Estimated countercyclical buffer as of Sep-26. From 1 October 2026, Banco de España will increase its required countercyclical buffer over the exposures located in Spain from 0.5% to 1.0%, with an estimated impact of +11bps on the Group's countercyclical buffer requirement. (2) Estimated systemic risk buffer as of Sep-26. (3) Maximum distributable amount (MDA) trigger = 2.82% - 0.28% = 2.54% (28bps of AT1 shortfall is covered with CET1). Santander Parent Bank has €80.9bn in Available Distributable Items. This amount of ADI represents c.130 times the full Parent AT1 budgeted for 2026. CET1CCoB Pillar 1 AT1 G-SIB/O-SII buffer Tier 2 Tier 2 AT1 Pillar 2 R 1 2 CET1 ratio of 12.7%, on track to meet our 12.8-13%target for the year, at the top end of our 12-13% operating range The minimum CET1 to be maintained by the Group is 9.86% As of Sep-26, the distance to the MDA is 254bps3 and the CET1 management buffer is 282bps +254bps +282bps +290bps SREP capital requirements and MDA* (Sep-26) 4.50% 12.69% 12.8-13% by year end 0.98% 2.50% 1.25% SyRB, 0.06% CCyB, 0.58% 1.83% 1.55% 1.50% 2.44% 2.78% 2.44% 14.12% 17.01% >16% Regulatory requirements 2026 Group ratios Sep-26 2026 target ratios

53 Bond portfolios(Sep-26 ) Spain 44% UK 6% Portugal 5% Openbank Europe 4% US 16% Mexico 8% Brazil 8% Chile 6% Rest of the Group 3% €182bn o/w HTC €143bn (79%) ALCO IRRBB €132bn Liquidity portfolio €50bn €182bn Diversified bond portfolio represents just 9% of total assets Note: ALCO IRRBB: portfolio used by the asset and liability committee to manage interest rate risk in the banking book. Bond portfolio represents 9% of total assets HTC&S duration: 1.8 years Mark to market impact of the HTC portfolio equivalent to c.4% of total CET1 (€84.1bn)

54 5.2 10.1 7.5 1.0 4.8 0.4 3.9 0.9 3.2 0.9 0.5 1.2 1.9 11.2 17.4 11.4 0.7 1.5 Covered bonds Senior Senior non- preferred AT1 Tier 2 Other3 Conservative and decentralized liquidity and funding model (1) Data includes public issuances from all units with period-average exchange rates. Excludes securitizations. (2) $0.8bn (€0.7bn) of AT1 (net between a $1.5bn issuance, ISIN US05971KAY55, and $0.7bn repurchased following the tender offer exercise on ISIN US05971KAH23, both executed in Jun-26). (3) Includes AT1 / Preferred shares and Tier 2 / Subordinated. (4) Other includes issuances in the year-to-date in Portugal, Chile, Mexico and Argentina. 2026 2027 2028 2029 >20302030 Covered Bonds Senior Senior non- preferred 0.3 12.9 9.0 12.3 5.5 17.0 2.9 12.7 16.6 7.9 9.7 28.1 2.1 7.7 8.2 13.8 11.8 22.1 0.0 0.1 1.6 0.2 2.3 25.2 2 Spain UK Openbank Europe Brazil US Other4 Very manageable maturity profile(€ bn, Sep-26)€42.8bn1issued in public markets in 9M'26(€ b , Sep-26)

55 Plan Issued Plan Issued Plan Issued Plan Issued Banco Santander, S.A. 1 - 2.5 1.7 13 - 15 14.1 4 - 5 5.2 18 - 22.5 20.9 UK - - 3 - 5.5 4.2 3 - 4 4.8 6 - 9.5 9.1 SHUSA - - 1 - 3 3.2 - - 1 - 3 3.2 TOTAL 1 - 2.5 1.7 17 - 23.5 21.6 7 - 9 10.0 25 - 35 33.2 AT1 + Tier 2 SNP + Senior Covered Bonds TOTAL 2026 issuances against funding plan Note: Issuance plan is subject to, amongst other considerations, market conditions and regulatory requirements. Other secured issuances (for example ABS, RMBS, etc.) are not considered in the table above. (1) Includes €1bn Tier 2 issued in Apr-26 and $0.8bn (€0.7bn) of AT1 (net between a $1.5bn issuance, ISIN US05971KAY55, and $0.7bn repurchased following the tender offer exercise on ISIN US05971KAH23, both executed in Jun-26). (2) The funding plan has been adjusted following the Webster acquisition. Total senior unsecured issuance remains unchanged, with the mix shifting towards a higher proportion of Senior Non-Preferred versus Senior Preferred instruments, while Covered Bond issuance increases. (3) Includes €2.6bn Senior Non-Preferred (SNP) and €0.6bn Senior Preferred issued in 2025, as pre-funding for the 2026 funding plan. • Continue fulfilling the 1.5% AT1 and 2.4% Tier 2 buffers subject to RWA growth • MREL & TLAC ratios above regulatory requirements • Maintain a solid liquidity position, with LCR and NSFR above minimum requirements and ample liquidity buffers 1 Banco Santander, S.A.’s 2026 funding plan contemplates the following: 3 31 Execution of 2026 funding plan(€ b , Sep-26) 2 22

56 95.0 10.1 11.8 1.3 34.2 27.8 180.1 MREL instruments 31.2% 11.9% 4.5% 4.6% 2.9% 40.3% 14.7% % RWAs % LE 18.0% 6.8% 4.5% 3.6% 0.3% 26.1% 7.1% % RWAs % LE TLAC/MREL for the Resolution Group headed by Banco Santander, S.A. (1) TLAC RWAs are €311bn and leverage exposure (LE) is €1,141bn. MREL RWAs are €447bn and leverage exposure is €1,223bn. (2) MREL Requirement based on RWAs from Jun-26: 31.17% + Combined Buffer Requirement (CBR). Req.2 35.7% SNP T2 CET1 Senior AT1 Sub debt Req. 22.5% Distance to M-MDA 1 1 1 1 Requirement CBR Buffer MREL(% and € bn, Sep-26(e))TLAC(%, Sep-26(e)) €11.2bn 361bps €4.0bn 35bps €20.7bn 464bps €35.0bn 286bps Requirement CBR Buffer

57 Note: liquidity balance sheet for management purposes (net of trading derivatives and interbank balances). (1) Provisional data. HQLAs used in the consolidated LCR numerator: €323bn. See Glossary for definitions. (2) UK: Ring-fenced bank, local criteria; Spain: Banco Santander, S.A. standalone. (3) Group LCR. Consolidated LCR 140% in Sep-26 and 147% in Jun-26. See Glossary for definitions. Well-funded, diversified, prudently managed and highly liquid balance sheet with a large contribution from customer deposits, reflected in solid liquidity ratios Sep-26 Jun-26 Jun-26 Spain 2 141% 152% 121% UK 2 172% 163% 130% Portugal 134% 142% 118% OB Europe 221% 209% 121% US 135% 165% 121% Mexico 133% 144% 117% Brazil 191% 184% 121% Chile 152% 165% 117% Argentina 126% 149% 152% Group³ 145% 154% 124% Net Stable Funding Ratio (NSFR)1 Liquidity Coverage Ratio (LCR) HQLAs1 HQLAs Level 1 337.5 HQLAs Level 2 8.6 o/w Level 2A 4.5 o/w Level 2B 4.2 1 €346bn o/w cash €156bn ST Funding Securitizations and others Loans and advances to customers Fixed assets & other Customer deposits M/LT debt issuances Equity and other liabilities Financial assets 468 52 88 187 1,207 230 72 1,222 1,763 1,763 Assets Liabilities Liquidity balance sheet(€ bn, Sep-26)

59 Reconciliation of underlying results to statutory results EUR mn Note: for explanation of adjustments corresponding to 9M 2026 and 9M 2025 results, see additional note 2 on slide 63. (1) Includes exchange differences. Statutory results Adjustments Underlying results Statutory results Adjustments Underlying results Net interest income 34,545 69 34,614 31,559 40 31,599 Net fee income 10,349 — 10,349 9,501 (39) 9,462 Gains (losses) on financial transactions¹ 1,079 — 1,079 1,653 (6) 1,647 Other operating income 740 25 765 535 (0) 535 Total income 46,713 94 46,807 43,248 (5) 43,243 Total costs (18,972) (953) (19,925) (18,430) (1,193) (19,623) Net operating income 27,741 (859) 26,882 24,818 (1,198) 23,620 Net loan-loss provisions (10,060) — (10,060) (9,377) 469 (8,908) Other gains (losses) and provisions (2,892) 1,841 (1,051) (1,680) 978 (702) Profit before tax 14,789 982 15,771 13,761 249 14,010 Tax on profit (3,634) (282) (3,916) (3,560) (215) (3,775) Profit from continuing operations 11,155 700 11,855 10,201 34 10,235 Net profit from discontinued operations 1,895 (1,895) — 1,152 (1,152) — Consolidated profit 13,050 (1,195) 11,855 11,353 (1,118) 10,235 Non-controlling interests (645) (34) (679) (1,016) 405 (611) Profit attributable to the parent 12,405 (1,229) 11,176 10,337 (713) 9,624 January-September 2026 January-September 2025

61 Glossary - Acronyms • AI: Artificial Intelligence • A2A: Account-to-account • AM: Asset Management • AT1: Additional Tier 1 • AuMs: Assets under management • bn: Billion • bps: Basis points • c.: Circa • CAL: Customer assets and liabilities • CET1: Common equity tier 1 • CHF: Swiss franc • CIB: Corporate & Investment Banking • CoE: Cost of equity • CoR: Cost of risk • CRR: Capital Requirements Regulation • CX: Customer experience • DPS: Dividend per share • EBITDA: Earnings before interest, taxes, depreciation and amortization • ECB: European Central Bank • EPS: Earnings per share • EUR: Euro • EV: Electric vehicle • FTE: Full-time equivalent • FX: Foreign exchange • GB: Global Banking • GFT: Gains on financial transactions • GM: Global Markets • GTB: Global Transaction Banking • H: Half year • I&AMS: Insurance & Asset Management Solutions • IFRS: International Financial Reporting Standard • k: Thousands • LatAm: Latin America • LLPs: Loan-loss provisions • M&A: Mergers and acquisitions • mn: Million • MSD: Mid-single digit • NII: Net interest income • NIM: Net interest margin • NOI: Net operating income • NPL: Non-performing loans • P&L: Profit and loss • PAT: Profit after tax • Payments: Payment Solutions • PB: Private Banking • PBT: Profit before tax • pp: Percentage points • ps: Per share • Q: Quarter • QoQ: Quarter-on-quarter • Repos: Repurchase agreements • Retail: Retail & Commercial Banking • RoRWA: Return on risk-weighted assets • RoTE: Return on tangible equity • RWA: Risk-weighted assets • SBB: Share buybacks • SME: Small and medium enterprises • UK: United Kingdom • US: United States • TNAV: Tangible net asset value • TPV: Total payment volume • YoY: Year-on-Year • YTD: Year to date • Wealth: Wealth Management & Insurance • #: Number

62 Glossary - Definitions Note: the averages for the RoTE and RoRWA denominators are calculated using the monthly average over the period, which we believe should not differ materially from using daily balances. The risk-weighted assets included in the denominator of the RoRWA metric are calculated in line with the criteria laid out in the CRR (Capital Requirements Regulation). (1) Excluding the adjustment to the valuation of goodwill, since they are not considered in the denominator, we believe this calculation is more correct. (2) Stockholders’ equity = Capital and Reserves + Accumulated other comprehensive income + Profit attributable to the parent + Dividends. For more information, please see ‘Alternative Performance Measures’ section of the Quarterly Financial Report. PROFITABILITY AND EFFICIENCY • Underlying RoTE: Underlying profit attributable to the parent minus AT1 costs (annualized)1 / Average stockholders' equity2 (excl. minority interests) - intangible assets • RoRWA: Consolidated profit (annualized) / Average risk-weighted assets • Efficiency: Underlying total costs / Underlying total income. Total costs defined as administrative expenses + amortizations + other operating costs VOLUMES • Loans: Gross loans and advances to customers (excluding reverse repos) • Deposits: Customer deposits (excluding repos) CREDIT RISK • NPL ratio: Credit impaired customer loans and advances, guarantees and undrawn balances and debt securities issued by non-financial institutions / Total risk Total risk is defined as: non-impaired and impaired customer loans and advances and guarantees + impaired undrawn customer balances + debt securities issued by non-financial institutions • NPL coverage ratio: Total allowances to cover impairment losses on customer loans and advances, guarantees and undrawn balances and debt securities issued by non-financial institutions / Credit impaired customer loans and advances, guarantees and undrawn balances and debt securities issued by non-financial institutions • Cost of risk: Underlying allowances for loan-loss provisions over the last 12 months / Average loans and advances to customers and debt securities issued by non-financial institutions over the last 12 months CAPITALIZATION • TNAV per share: Tangible book value / Number of shares excluding treasury stock. Tangible book value calculated as Stockholders' equity (excl. minority interests) - intangible assets LIQUIDITY • Group LCR: This ratio is calculated using an internal methodology that determines the common minimum percentage of simultaneous coverage in all Group jurisdictions, taking into account all existing restrictions on the transfer of liquidity in third countries. This methodology reflects more accurately the Group’s resilience to liquidity risk • Consolidated LCR: This ratio is calculated, at the request of the ECB, using a consolidation methodology that does not take into account any excess liquidity in excess of 100% of the LCR outflows and that is subject to transferability restrictions (legal or operational) in third countries, even if such excess liquidity can be used to cover additional outflows within the country itself, which is not subject to any restrictions

63 Additional notes (1) Phased-in ratio calculated in accordance with the transitory treatment of the CRR. • Capital distribution includes deductions for accrual of ordinary shareholder remuneration and AT1 costs. The board of directors intends to: i) apply an ordinary shareholder remuneration policy for 2026 to 2028 results that entails distributing approximately 50% of the Group’s underlying profit (excluding non-cash, non-capital ratios impact items), split approximately evenly between cash dividends and share buybacks for 2026 results; and ii) distribute any excess capital to shareholders at the end of the 2026-2028 period. From 2027 results, the ordinary shareholder remuneration policy is expected to comprise around 35% of the Group's underlying profit (on the same basis) in cash dividends and around 15% in share buybacks. The execution of the ordinary shareholder remuneration policy and the distribution of any excess capital to shareholders at the end of the 2026-2028 period is subject to corporate and regulatory decisions and approvals. • Business RWA change net of risk transfer initiatives. (2) Explanation of adjustments corresponding to 9M 2026 results: • Regarding the reclassification of items within the underlying income statement: − In all quarters, certain charges recorded in the statutory account under the line items that comprise 'other gains (losses) and provisions' are presented in the underlying income statement under the 'total costs' line item. These are mainly related to recurring operating charges, primarily related to labour and legal processes, amounting to EUR 1,006 million. − In Q2 2026, an additional provision totalling EUR 39 million, net of tax and non-controlling interests, was recorded for potential complaints related to motor finance dealer commissions in the UK associated with our joint ventures. In the underlying income statement, this provision has been reclassified from a line item that is aggregated within ‘other operating income’, from 'tax on profit' and from 'non-controlling interests' to 'other gains (losses) and provisions', thereby recording the full amount in aggregate in a single line item. − In Q3 2026, we recorded: i) a EUR 69 million charge in Openbank Europe related to the Court of Justice of the European Union (CJEU) ruling regarding charging interest on costs associated with consumer credit. We reclassified this charge from 'net interest income' to 'other gains (losses) and provisions’; and ii) EUR 53 million of amortizations related to customer deposit intangibles arising from the Webster and TSB acquisitions, included within ‘total costs’. However, in the underlying income statement, this amortization was recorded under ‘other gains (losses) and provisions’. • Additionally, in the underlying income statement, the following items, totalling EUR 1,229 million, included in the statutory income statement have been excluded from underlying profit: − The capital gain resulting from the completion of the Poland disposal in Q1 2026 totalling EUR 1,895 million recorded in the statutory income statement in the 'profit/(loss) after tax from discontinued operations' line item. − Some charges for intangible asset impairments and integration costs associated with the M&A transactions totalling EUR 666 million (net of tax and non-controlling interests) recorded in the statutory income statement in the 'provisions or reversal of provisions' and 'impairment on other assets (net)' line items, aggregated in 'other gains (losses) and provisions’. Explanation of adjustments corresponding to 9M 2025 results. • Regarding the reclassification of items within the underlying income statement: − In all quarters, certain charges recorded in the statutory account under the line items that comprise 'other gains (losses) and provisions' are presented in the underlying income statement under the 'total costs' line item. These are mainly related to recurring operating charges, primarily related to labour and legal processes, amounting to EUR 1,210 million. • Additionally, in the underlying income statement, the following items, totalling EUR 713 million, included in the statutory income statement have been excluded from underlying profit: − The results associated with the business subject to the Poland disposal across all periods are reported in the 'profit/(loss) after tax from discontinued operations' line item. − In Q2 2025, two events of the same value but opposite signs: i) a capital gain, that falls outside the ordinary course of our business, of EUR 231 million from the sale of Santander’s remaining 30.5% stake in CACEIS; and ii) a one-off charge of EUR 467 million (EUR 231 million, net of tax and minority interests), which strengthened the balance sheet after having updated macroeconomic parameters in Brazil’s credit provisioning models.

Thank you

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Banco Santander, S.A. Date: 28 October 2026 By: /s/ José García Cantera Name: José García Cantera Title: Chief Financial Officer