6-K 1 aciu-20260630x6k.htm 6-K

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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 August, 2026

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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 herewith) shall be deemed to be incorporated by reference into the registration statements on Form F-3 (File Nos. 333-227016, 333-249655 and 333-277940) and Form S-8 (File Nos. 333-213865, 333-216539 and 333-233019) of AC Immune SA and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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​ | AC IMMUNE SA
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​ | By: | /s/ Martin Zuegel
​ | ​ | Name: Martin Zuegel
​ | ​ | Title: Interim Chief Executive Officer
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​ | By: | /s/ Christopher Roberts
​ | ​ | Name: Christopher Roberts
​ | ​ | Title: Chief Financial Officer
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Date: August 5, 2026 | ​ | ​

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EXHIBIT INDEX

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Exhibit Number | ​ ​ ​ | Description
99.1 | ​ | Interim Condensed Consolidated Financial Statements (Unaudited) (IFRS) as of and for the six months ended June 30, 2026
99.2 | ​ | Management’s Discussion and Analysis of Financial Condition and Results of Operations
99.3 | ​ | Press Release dated August 5, 2026
99.4 | ​ | Articles of Association of AC Immune SA

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