Company: BCDRF
Filing Date: 2025-06-24
Form Type: CB
Source: 0000950103-25-007733
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-06-24
Form: CB
Chunk 1
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, 2025                                                            |
|:------------|:-------------------------------------------------------------------------------------------------------|
| 1.2         | English translation of the “inside information” announcement regarding the launch of the tender offer* |
| 1.3         | Press release announcing the launch of the tender offer                                                |

| * | 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).                                                                                                       |

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 applicable. |

<div align='center'>2

PART IV - SIGNATURES</div>

After due inquiry and to the best of my knowledge
and belief, I certify that the information set forth in this statement is true, complete and correct.

| /s/ José                       
 Antonio Soler Ramos            |
| (Signature)                    |
| José Antonio Soler Ramos       
 Deputy Chief Financial Officer 
 Banco Santander, S.A.          |
| (Name and Title)               |
| June 24,                       
 2025                           |
| (Date)                         |

<div align='center'>3</div>