DGAP Voting Rights Announcement: Siltronic AG Siltronic AG: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution 2021-08-05 / 12:57 Dissemination of a Voting Rights Announcement transmitted by DGAP - a service of EQS Group AG. The issuer is solely responsible for the content of this announcement. ----------------------------------------------------------------------------------------------------------------------- Notification of Major Holdings 1. Details of issuer Name: Siltronic AG Street: Einsteinstr. 172 Postal code: 81677 City: Munich

Germany Legal Entity Identifier (LEI): 5299003NKV26NNGHHR90 2. Reason for notification

Acquisition/disposal of shares with voting rights X Acquisition/disposal of instruments

Change of breakdown of voting rights

Other reason: 3. Details of person subject to the notification obligation Legal entity: The Goldman Sachs Group, Inc. City of registered office, country: Wilmington, DE, United States of America (USA) 4. Names of shareholder(s) holding directly 3% or more voting rights, if different from 3. 5. Date on which threshold was crossed or reached: 30 Jul 2021 6. Total positions

% of voting rights % of voting rights through Total of

attached to shares instruments both in % Total number of voting rights

(total of 7.a.) (total of 7.b.1 + 7.b.2) (7.a. + pursuant to Sec. 41 WpHG

7.b.) New 1.65 % 3.48 % 5.13 % 30000000 Previous 0.07 % 5.01 % 5.08 % / notification 7. Details on total positions a. Voting rights attached to shares (Sec. 33, 34 WpHG) ISIN Absolute In %

Direct Indirect Direct Indirect

(Sec. 33 WpHG) (Sec. 34 WpHG) (Sec. 33 WpHG) (Sec. 34 WpHG) DE000WAF3001 0 494125 0 % 1.65 % Total 494125 1.65 % b.1. Instruments according to Sec. 38 (1) no. 1 WpHG Type of instrument Expiration or maturity date Exercise or conversion Voting rights absolute Voting rights in %

period Right To Recall Open 1042227 3.47 %

Total 1042227 3.47 % b.2. Instruments according to Sec. 38 (1) no. 2 WpHG Type of Expiration or maturity Exercise or conversion Cash or physical Voting rights Voting rights instrument date period settlement absolute in % Swap 15.07.2025 Cash 1430 0.005 %

Total 1430 0.005 % 8. Information in relation to the person subject to the notification obligation

Person subject to the notification obligation is not controlled nor does it control any other

undertaking(s) that directly or indirectly hold(s) an interest in the (underlying) issuer (1.). X Full chain of controlled undertakings starting with the ultimate controlling natural person or legal

entity: Name % of voting rights (if at % of voting rights through instruments Total of both (if at

least 3% or more) (if at least 5% or more) least 5% or more) The Goldman Sachs % % % Group, Inc. GSAM Holdings LLC % % % Goldman Sachs Asset % % % Management, L.P. - % % % The Goldman Sachs % % % Group, Inc. Goldman Sachs & Co. LLC % % % - % % % The Goldman Sachs % % % Group, Inc. Goldman Sachs (UK) % % % L.L.C. Goldman Sachs Group UK % % % Limited Goldman Sachs % % 5.11 % International 9. In case of proxy voting according to Sec. 34 para. 3 WpHG (only in case of attribution of voting rights in accordance with Sec. 34 para. 1 sent. 1 No. 6 WpHG) Date of general meeting: Holding total positions after general meeting (6.) after annual general meeting: Proportion of voting rights Proportion of instruments Total of both

% % % 10. Other explanatory remarks: Date 04 Aug 2021 -----------------------------------------------------------------------------------------------------------------------

2021-08-05 The DGAP Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases. Archive at www.dgap.de ----------------------------------------------------------------------------------------------------------------------- Language: English Company: Siltronic AG

Einsteinstr. 172

81677 Munich

Germany Internet: www.siltronic.com End of News DGAP News Service -------------

1224361 2021-08-05

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August 05, 2021 06:57 ET (10:57 GMT)