ACIU AC Immune SA

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

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For the month of April, 2023

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Commission file number: 001-37891

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AC IMMUNE SA

(Exact Name of Registrant as Specified in Its Charter)

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EPFL Innovation Park

Building B

1015 Lausanne, Switzerland

(Address of Principal Executive Offices)

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

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Form 20-F ☒     Form 40-F ☐

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This Report on Form 6-K (excluding Exhibit 99.3 and Exhibit 99.4 herewith) is incorporated by reference into the Registrant’s registration statement on Form F-3 (File Nos. 333-227016, 333-249655 and 333-255576) and Form S-8 (File No. 333-233019).

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