Investor Presentation FY 2020

Tax rate significantly down Effects on tax expense in 2020 Tax expense w/o special effects Tax effects in USA Tax effects in Germany One-time payment to pension fund Tax expense incl. special effects (siltronic perfect silicon solutions Siltronic AG - Investor Presentation FY 2020 March 9, 2021 Tax rate: 8% Tax rate: 1% Comments ▸ The negative tax rate in Q4 due to one- time effects on current and deferred taxes Tax rate in 2020 only 1% ‣ USA Significant tax benefits to reduce burden of Corona pandemic ▸ Germany ▸ Degressive depreciation introduced. ▸ Pension fund One-time payment to allow pension fund to reduce its discount rate 19 of 32

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