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