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v3.26.1

Additional disclosures - Schedule of preferred shares and securities by issuer (Details) € in Millions, £ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2025 | Aug. 01, 2024 | May 20, 2024 | Sep. 21, 2021 | May 12, 2021 | Jan. 14, 2020 | Dec. 31, 2025 EUR (€) | Dec. 31, 2025 USD ($) | Dec. 31, 2025 GBP (£)
Santander UK plc, October 1995 | Fixed rate debt | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | £ |  |  |  |  |  |  |  |  | £ 80.3
Interest rate |  |  |  |  |  |  | 10.375% | 10.375% | 10.375%
Santander UK plc, February 1996 | Fixed rate debt | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | £ |  |  |  |  |  |  |  |  | £ 80.3
Interest rate |  |  |  |  |  |  | 10.375% | 10.375% | 10.375%
Banco Santander, S.A., January 2020 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.375% | 4.375% | 4.375% | 4.375%
Subordinated issue, initial interest rate term |  |  |  |  |  | 6 years | 6 years |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  | 4.534% |  |  |
Subordinated issue, mid-swap rate term |  |  |  |  |  | 5 years | 5 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  | 5 years | 5 years |  |
Banco Santander, S.A., January 2020 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 1,032.4 |  |
Interest rate |  |  |  |  |  |  | 4.375% | 4.375% | 4.375%
Banco Santander, S.A., January 2020 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 4.534% | 4.534% | 4.534%
Banco Santander, S.A., May 2021 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.75% |  |  |  |
Subordinated issue, initial interest rate term |  |  |  |  | 6 years |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  | 3.753% |  |  |  |
Subordinated issue, interest rate reprice term |  |  |  |  | 5 years |  |  |  |
Subordinated issue, UST rate term |  |  |  |  | 5 years |  |  |  |
Banco Santander, S.A., May 2021 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.75% | 4.75% | 4.75%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 6 years |  |
Subordinated issue, mid-swap rate term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., May 2021 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | $ |  |  |  |  |  |  |  | $ 999.9 |
Interest rate |  |  |  |  |  |  | 4.75% | 4.75% | 4.75%
Banco Santander, S.A., May 2021 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 3.753% | 3.753% | 3.753%
Banco Santander, S.A., May 2021 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.125% |  |  |  |
Subordinated issue, initial interest rate term |  |  |  |  | 7 years |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  | 4.311% |  |  |  |
Subordinated issue, mid-swap rate term |  |  |  |  | 5 years |  |  |  |
Subordinated issue, interest rate reprice term |  |  |  |  | 5 years |  |  |  |
Banco Santander, S.A., May 2021 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.125% | 4.125% | 4.125%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 7 years |  |
Subordinated issue, mid-swap rate term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., May 2021 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 749.2 |  |
Interest rate |  |  |  |  |  |  | 4.125% | 4.125% | 4.125%
Banco Santander, S.A., May 2021 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 4.311% | 4.311% | 4.311%
Banco Santander, S.A., September 2021 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.625% |  |  |  |  |
Subordinated issue, initial interest rate term |  |  |  | 8 years |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  | 3.76% |  |  |  |  |
Subordinated issue, mid-swap rate term |  |  |  | 5 years |  |  |  |  |
Subordinated issue, interest rate reprice term |  |  |  | 5 years |  |  |  |  |
Banco Santander, S.A., September 2021 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.625% | 3.625% | 3.625%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 8 years |  |
Subordinated issue, mid-swap rate term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., September 2021 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 994.0 |  |
Interest rate |  |  |  |  |  |  | 3.625% | 3.625% | 3.625%
Banco Santander, S.A., September 2021 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 3.76% | 3.76% | 3.76%
Banco Santander, S.A., November 2023 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 9.625% | 9.625% | 9.625%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 5 years 6 months |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, UST rate term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., November 2023 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | $ |  |  |  |  |  |  |  | $ 1,149.0 |
Interest rate |  |  |  |  |  |  | 9.625% | 9.625% | 9.625%
Banco Santander, S.A., November 2023 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 5.306% | 5.306% | 5.306%
Banco Santander, S.A., November 2023 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 9.625% | 9.625% | 9.625%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 10 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, UST rate term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., November 2023 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | $ |  |  |  |  |  |  |  | $ 1,349.7 |
Interest rate |  |  |  |  |  |  | 9.625% | 9.625% | 9.625%
Banco Santander, S.A., November 2023 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 5.298% | 5.298% | 5.298%
Banco Santander, S.A., May 2024 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  | 7.00% |  |  |  |  |  |
Subordinated issue, initial interest rate term |  |  | 6 years |  |  |  |  |  |
Subordinated issue, mid-swap rate term |  |  | 5 years |  |  |  |  |  |
Subordinated issue, interest rate reprice term |  |  | 5 years |  |  |  |  |  |
Banco Santander, S.A., May 2024 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 7.00% | 7.00% | 7.00%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 6 years |  |
Subordinated issue, mid-swap rate term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., May 2024 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 1,500.0 |  |
Interest rate |  |  |  |  |  |  | 7.00% | 7.00% | 7.00%
Banco Santander, S.A., May 2024 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  | 4.432% |  |  |  |  |  |
Banco Santander, S.A., May 2024 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 4.432% | 4.432% | 4.432%
Banco Santander, S.A., August 2024 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  | 8.00% |  |  |  |  |  |  |
Subordinated issue, initial interest rate term |  | 10 years |  |  |  |  |  |  |
Subordinated issue, mid-swap rate term |  | 5 years |  |  |  |  |  |  |
Subordinated issue, interest rate reprice term |  | 5 years |  |  |  |  |  |  |
Banco Santander, S.A., August 2024 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 8.00% | 8.00% | 8.00%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 10 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, UST rate term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., August 2024 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount | $ |  |  |  |  |  |  |  | $ 1,494.5 |
Interest rate |  |  |  |  |  |  | 8.00% | 8.00% | 8.00%
Banco Santander, S.A., August 2024 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  | 3.911% |  |  |  |  |  |  |
Banco Santander, S.A., August 2024 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 3.911% | 3.911% | 3.911%
Banco Santander, S.A., July 2025 | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate | 6.00% |  |  |  |  |  |  |  |
Subordinated issue, initial interest rate term | 6 years |  |  |  |  |  |  |  |
Subordinated issue, mid-swap rate term | 5 years |  |  |  |  |  |  |  |
Subordinated issue, interest rate reprice term | 5 years |  |  |  |  |  |  |  |
Banco Santander, S.A., July 2025 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%
Subordinated issue, initial interest rate term |  |  |  |  |  |  | 6 years |  |
Subordinated issue, interest rate reprice term |  |  |  |  |  |  | 5 years |  |
Subordinated issue, UST rate term |  |  |  |  |  |  | 5 years |  |
Banco Santander, S.A., July 2025 | Fixed rate debt | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 1,500.0 |  |
Interest rate |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%
Banco Santander, S.A., July 2025 | 5-Year Mid-Swap Rate (Euro) | Subordinated liabilities, preference shares |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate | 3.819% |  |  |  |  |  |  |  |
Banco Santander, S.A., July 2025 | 5-Year UST Rate (US Dollar) | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Subordinated issue, adjustment to reference rate |  |  |  |  |  |  | 3.819% | 3.819% | 3.819%
Santander Finance Preferred, S.A. (Unipersonal), September 2004 | CMS10 | Subordinated liabilities, preferred securities |  |  |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |  |  |
Outstanding issue amount |  |  |  |  |  |  | € 143.8 |  |
Interest rate |  |  |  |  |  |  | 8.00% | 8.00% | 8.00%
Variable interest rate |  |  |  |  |  |  | 0.05% | 0.05% | 0.05%

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