# EDGAR Filing Document

**Accession Number:** 0000891478
**File Stem:** 0000950103-26-003282
**Filing Date:** 2026-3
**Character Count:** 5138
**Document Hash:** 65c742ce8af479cb05a5d02c8bc4fb72
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950103-26-003282.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0000950103-26-003282

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20260305

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Banco Santander, S.A.
- **CENTRAL INDEX KEY:** 0000891478
- **STANDARD INDUSTRIAL CLASSIFICATION:** COMMERCIAL BANKS, NEC [6029]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 132617929
- **STATE OF INCORPORATION:** U3
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-12518
- **FILM NUMBER:** 26724096

**BUSINESS ADDRESS:**
- **STREET 1:** CIUDAD GRUPO SANTANDER
- **STREET 2:** BOADILLA DEL MONTE
- **CITY:** MADRID
- **STATE:** U3
- **ZIP:** 28660
- **BUSINESS PHONE:** 34 91 289 32 80

**MAIL ADDRESS:**
- **STREET 1:** CIUDAD GRUPO SANTANDER
- **STREET 2:** BOADILLA DEL MONTE
- **CITY:** MADRID
- **STATE:** U3
- **ZIP:** 28660

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANCO SANTANDER SA
- **DATE OF NAME CHANGE:** 20070925

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANCO SANTANDER CENTRAL HISPANO SA
- **DATE OF NAME CHANGE:** 19990512

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANCO SANTANDER S A
- **DATE OF NAME CHANGE:** 19931201

**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, 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 <u>X</u> Form 40-F  

**Banco Santander, S.A.**

**TABLE OF CONTENTS**

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| | |
|:---|:---|
| **Item**  |  |
| 1 | Report of Other Relevant Information dated March 5, 2026 |

---

**Item 1**

![](image_001.jpg)

**Banco Santander, S.A.** (the "**Bank**" or "**Banco Santander**"), in compliance with the Securities Market legislation, hereby communicates the following:

**<u>OTHER RELEVANT INFORMATION</u>**

Reference is made to our notice of inside information of 4 February 2026 (official registry number 3077) (the "**Buyback Commencement Communication**"), relating to the buyback programme of own shares (the "**Buyback Programme**") approved by the Board of Directors of Banco Santander.

Pursuant to article 5 of Regulation (EU) no. 596/2014 on Market Abuse of 16 April 2014, and articles 2.2 and 2.3 of Commission Delegated Regulation (EU) 2016/1052, of 8 March 2016, the Bank informs of the transactions carried out over its own shares between 27 February and 4 March (both inclusive).

The cash amount of the shares purchased to 4 March 2026 as a result of the execution of the Buyback Programme amounts to 1,816,349,835 Euros, which represents approximately 36.1% of the maximum investment amount of the Buyback Programme. The programme was announced together with its other characteristics through the Buyback Commencement Communication. With these purchases, the Bank has repurchased approximately 16.3% of its outstanding shares as of 2021.

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| Date | Security | Transaction | Trading venue | Number of shares | Weighted average price (€) |
| 27/02/2026 | SAN | Purchase | XMAD | 5000000 | 10.8788 |
| 02/03/2026 | SAN | Purchase | XMAD | 5000000 | 10.3017 |
| 02/03/2026 | SAN | Purchase | CEUX | 2000000 | 10.3022 |
| 03/03/2026 | SAN | Purchase | XMAD | 5000000 | 9.5657 |
| 03/03/2026 | SAN | Purchase | CEUX | 3000000 | 9.5663 |
| 04/03/2026 | SAN | Purchase | XMAD | 4084830 | 9.8929 |
|  |  |  | **TOTAL** | **24084830** |  |

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**Issuer name**: Banco Santander, S.A. - LEI 5493006QMFDDMYWIAM13

**Reference of the financial instrument**: ordinary shares - Code ISIN ES0113900J37

Detailed information of the transactions carried out within the referred period is attached as Annex I.

Boadilla del Monte (Madrid), 5 March 2026

![](image_002.jpg)

**ANNEX I**

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 27/02/2026 and 04/03/2026 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-27-feb-a-04-marzo-2026-es.pdf)

**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.

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| | | | | |
|:---|:---|:---|:---|:---|
| | | **Banco Santander, S.A.** | **Banco Santander, S.A.** | **Banco Santander, S.A.** |
| Date: | March 5, 2026 | By: | /s/ Pedro de Mingo Kaminouchi | /s/ Pedro de Mingo Kaminouchi |
|  |  |  | Name: | Pedro de Mingo Kaminouchi |
|  |  |  | Title: | Head of Corporate Compliance |

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