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 May, 2023 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 o ...

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ending 31 December 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transi ...

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 March, 2023 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 ...

Banco Santander SA (NYSE:SAN) Q4 2022 Earnings Conference Call February 2, 2023 4:00 AM ET Company Participants Begona Morenes - IR Ana Botin - Group Executive Chairwoman Hector Grisi - Group CEO & Group Director Jose Garcia-Cantera - Senior EVP & Group CFO Conference Call Participants Francisco Riquel - Alantra Ignacio Olmos - UBS Ignacio Ulargui - BNP Paribas Exane Alvaro Serrano - Morgan Stanley Carlos Cobo Catena - Societe Generale Andrea Filtri - Mediobanca Benjamin Toms - RBC Capital Markets Daragh Q ...

Banco Santander S.A. (NYSE:SAN) Q3 2022 Earnings Conference Call October 26, 2022 4:00 AM ET Company Participants Begona Morenes - Investor Relations Jose Antonio Alvarez - Chief Executive Officer Jose Garcia Cantera - Chief Financial Officer Conference Call Participants Ignacio Ulargui - BNP Paribas Francisco Riquel - Alantra Alvaro Serrano - Morgan Stanley Sofie Peterzens - JPMorgan Carlos Cobo Catena - Societe Generale Marta Sanchez Romero - Citi Carlos Peixoto - CaixaBank Pamela Zuluaga - Credit Suisse ...

Banco Santander S.A. (NYSE:SAN) Q2 2022 Earnings Conference Call July 29, 2022 4:00 AM ET Company Participants Begona Morenes - IR Jose Antonio Alvarez - CEO Jose Garcia Cantera - CFO Conference Call Participants Alvaro Serrano - Morgan Stanley Ignacio Ulargui - BNP Paribas Pamela Zuluaga - Credit Suisse Sofie Peterzens - JPMorgan Benjie Creelan-Sandford - Jefferies Ignacio Cerezo - UBS Carlos Peixoto - CaixaBank Andrea Filtri - Mediobanca Carlos Cobo Catena - Societe Generale Britta Schmidt - Autonomous Re ...

Banco Santander SA (NYSE:SAN) Q1 2022 Earnings Conference Call April 26, 2022 4:00 AM ET Company Participants Jose Antonio Alvarez - CEO & Vice Chairman Jose Garcia-Cantera - Senior EVP & Group CFO Conference Call Participants Ignacio Cerezo - UBS Sofie Peterzens - JPMorgan Chase & Co. Carlos Cobo Catena - Societe Generale Pamela Zuluaga - Crédit Suisse Alvaro Serrano - Morgan Stanley Andrea Filtri - Mediobanca Francisco Riquel - Alantra Carlos Peixoto - CaixaBank BPI Daragh Quinn - KBW Britta Schmidt - Aut ...

26 April 2022 Q1'22 Earnings Presentation It's time to build together a better future for you & Santander Important information Non-IFRS and alternative performance measures This presentation contains, in addition to the financial information prepared in accordance with International Financial Reporting Standards ("IFRS") and derived from our financial statements, alternative performance measures ("APMs") as defined in the Guidelines on Alternative Performance Measures issued by the European Securities and ...

All. Together. Now 2021 Earnings Presentation Santander Important information Non-IFRS and alternative performance measures This presentation contains, in addition to the financial information prepared in accordance with International Financial Reporting Standards ("IFRS") and derived from our financial statements, 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 (ESMA/2 ...

Banco Santander, S.A. (NYSE:SAN) Q4 2021 Earnings Conference Call February 2, 2022 4:00 AM ET Company Participants Ana BotÃn – Executive Chairman José Antonio Ãlvarez – Vice Chairman and Chief Executive Officer Conference Call Participants Britta Schmidt – Autonomous Research Alvaro Serrano – Morgan Stanley Sofie Peterzens – JP Morgan Benjamin Toms – RBC Ignacio Ulargui – BNP Paribas Marta Sanchez Romero – Bank of America Daragh Quinn – KBW Mario Ropero – Bestinver Securities Andrea Filtri – Mediobanca Benj ...