Investor Presentation FY 2020

Pension reserves impacted by low IFRS interest rates DBO and pension reserves, in EUR m 1,278 ~850 USA mostly funded 142 2.07% 147 3% Germany unfunded 217 0.69% ~140 3% 711 108 50 Tii Funded through Wacker Pension Fund 919 0.69% DBO Dec, 2020 -560 3% DBO @3% 553 Assets Dec, 2020 Comment ▸ DBO of EUR 1,278 million - assets of EUR 711 million = EUR 567 million Pension reserves @3% = DBO of EUR ~850 million – assets EURO 711 million = EUR 139 million - ➤ IFRS interest uses bond yields only, assets include bonds, equity, real estate + derivatives ▸ Wacker pension fund ▸ fully funded under German pension fund regulations using 3.23% interest rate ▸ asset liability study: probability of return in next 20 years: ≥3.5% 59% ≥3.0% 75% ≥2.5% 87% (siltronic perfect silicon solutions Siltronic AG - Investor Presentation FY 2020 March 9, 2021 22 of 32

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