Company: BCDRF
Filing Date: 2025-10-31
Form Type: 424B5
Source: 0001193125-25-260533
Chunk: 242

Company: Banco Santander, S.A.
Filing Date: 2025-10-31
Form: 424B5
Chunk 242
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 of an inside information/other relevant information ( información privilegiada/ otra información relevante) announcement with the CNMV and its publication in accordance with the rules and regulations of any applicable stock exchange or other relevant authority and in accordance with “ —Notices” below promptly after the determination thereof. Conversion Procedures If the Trigger Event occurs at any time on or after the issue date of any series of contingent convertible capital securities, then Banco Santander will: notify the Regulator and holders of such series of contingent convertible capital securities immediately through (i) the filing of an inside information/other relevant information ( información privilegiada/ otra información relevante) announcement with the CNMV and its publication in accordance with the rules and regulations of any applicable stock exchange or other relevant authority and (ii) to the Regulator, holders and the Trustee in accordance with “ —Notices” below (the “Trigger Event Notice”); A Trigger Event Notice shall be a written notice specifying the following information:

| • |     | that a Trigger Event has occurred; |

103

| • |     | the then-prevailing Conversion Price (which Conversion Price shall remain subject to any subsequent adjustment as 
 set forth under “—Anti-Dilution Adjustment of the Floor Price”);                                                  |

| • |     | the Conversion Settlement Date; |

| • |     | the date on which Banco Santander expects DTC to suspend all clearance and settlement of transactions in the 
 Securities in accordance with its rules and procedures (the “Suspension Date”);                              |

| • |     | the contact details of the Settlement Shares Depository (if one has been appointed) and Paying and Conversion                                              
 Agent and the procedures holders of the contingent convertible capital securities must follow to obtain delivery of the Conversion Shares or related ADSs; |

| • |     | if Banco Santander has been unable to appoint a Settlement Shares Depository, such other arrangements for the                                                                          
 issuance and/or delivery of the Conversion Shares to the holders of the contingent convertible capital securities of such series as it shall consider reasonable in the circumstances; |

| • |     | that the contingent convertible capital securities shall remain in existence for the sole purpose of evidencing    
 the holder’s right to receive Common Shares or related ADSs from or on behalf of the Settlement Shares Depository. |

The failure to notify the Regulator and holders of such series contingent convertible capital securities as aforesaid will not invalidate the conversion. The date on which the Trigger Event Notice shall be deemed to have been given shall