Andrea Pfeifer - 15 May 2026 Form 4 Insider Report for AC Immune SA (ACIU)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: ACIU
Reported as of: 15 May 2026
Net transaction value: -$27,935
SEC form: 4
Accepted by SEC: 18 May 2026, 16:25:40 UTC
Prior SEC filing: 16 Apr 2026
Source filing: View source filing
Reporting owner signature: Matthias Maurer as Attorney-in-Fact for Andrea Pfeifer

Key filing fact

Andrea Pfeifer filed Form 4 for AC Immune SA (ACIU) on 18 May 2026.

Key facts

This page summarizes Andrea Pfeifer's Form 4 filing for AC Immune SA (ACIU).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 18 May 2026, 16:25.

Change

Previous filing in this sequence was filed on 16 Apr 2026.
Current net transaction value: -$27,935.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001697107 Primary reporting owner

Pfeifer Andrea

Relationship: Chief Executive Officer, Director
Address: C/O AC IMMUNE SA, EPFL INNOVATION PARK BUILDING B, LAUSANNE, SWITZERLAND
Signature: Matthias Maurer as Attorney-in-Fact for Andrea Pfeifer
Signature date: 18 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ACIU transaction

Common Share

Sale

Transaction value: $27,935
Shares: -10,000
Change %: -0.26%
Price: $2.79
Shares after: 3,820,288
Date: 15 May 2026
Ownership: Direct
Footnotes: F1, F2

ACIU holding

Common Share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 14,000
Date: 15 May 2026
Ownership: By spouse

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote F1

The price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.75 to $2.825. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Footnote F2

Includes 1,921,005 common shares underlying outstanding restricted share units.