Company: BCDRF
Filing Date: 2025-07-01
Form Type: CB/A
Source: 0000950103-25-008230
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-07-01
Form: CB/A
Chunk 1
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 2025                                                                                                             |
| (Date Tender Offer/Rights Offering Commenced)                                                                             |

<div align='center'>PART I - INFORMATION SENT TO SECURITY HOLDERS</div>

Item 1. Home Jurisdiction Documents

(a) The following documents are attached hereto
as exhibits to this form:

| Exhibit No. 
 1.1         | Description                                                                                                                       
 Tender offer memorandum dated June 24, 20251                                                                                      |
|:------------|:----------------------------------------------------------------------------------------------------------------------------------|
| 1.2         | English translation of the “inside information” announcement regarding the launch of the tender offer2                            |
| 1.3         | Press release announcing the launch of the tender offer1                                                                          |
| 1.4         | English translation of the “other relevant information” announcement regarding the maximum acceptance amount of the tender offer3 |
| 1.5         | Press release announcing the maximum acceptance amount of the tender offer4                                                       |
| 1.6         | English                                                                                                                           
 translation of the “other relevant information” announcement regarding the                                                        
 results of the tender offer5                                                                                                      |
| 1.7         | Press release announcing the results of the tender offer                                                                          |

| 2 | Incorporated                                                                                                                                                
 by reference to the Company’s Report on Form 6-K furnished to the Securities and Exchange Commission on June 24, 2025 (accession no. 0000950103-25-007723). |

| 3 | Incorporated                                                                                                                                                
 by reference to the Company’s Report on Form 6-K furnished to the Securities and Exchange Commission on June 24, 2025 (accession no. 0000950103-25-007750). |

| 5 | Incorporated by reference to the Company’s Report on Form 6-K furnished to the Securities 
 and Exchange Commission on July 1, 2025 (accession no. 0000950103-25-008222).             |

Item 2. Informational Legends

Not applicable.

<div align='center'>PART II - INFORMATION NOT REQUIRED TO BE SENT
TO SECURITY HOLDERS</div>

| (1) | Not applicable. |

| (2) | Not applicable. |

| (3) | Not applicable. |

<div align='center'>PART III - CONSENT TO SERVICE OF PROCESS</div>

| (1) | Written irrevocable consent and power of attorney on Form F-X filed concurrently with the Commission on June 24, 2025. |

| (2) | Not