Andrea Pfeifer - 15 Apr 2026 Form 4/A - Amendment Insider Report for AC Immune SA (ACIU)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: ACIU
Reported as of: 15 Apr 2026
Net transaction value: -$31,425
SEC form: 4/A - Amendment
Accepted by SEC: 16 Apr 2026, 12:39:29 UTC
Original report date: 16 Apr 2026
Prior SEC filing: 18 Mar 2026
Next SEC filing: 18 May 2026
Source filing: View source filing
Reporting owner signature: Matthias Maurer

Key filing fact

Andrea Pfeifer filed Form 4/A - Amendment for AC Immune SA (ACIU) on 16 Apr 2026.

Key facts

This page summarizes Andrea Pfeifer's Form 4/A - Amendment filing for AC Immune SA (ACIU).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 16 Apr 2026, 12:39.

Change

Previous filing in this sequence was filed on 18 Mar 2026.
Current net transaction value: -$31,425.

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/A - Amendment 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
Signature date: 16 Apr 2026

Reported non-derivative transactions

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

ACIU transaction

Sale

Transaction value: $31,425
Shares: -10,000
Change %: -0.26%
Price: $3.14
Shares after: 3,830,288
Date: 15 Apr 2026
Ownership: Direct
Footnotes: F1, F2, F3

ACIU holding

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 14,000
Date: 15 Apr 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 3 footnotes

Footnote F1

This Form 4/A amends the Form 4 filed on April 16, 2026, inadvertently reporting in column 3 a purchase of 10,000 shares on behalf of the reporting person. This amendment corrects that filing to reflect that the reporting person sold 10,000 shares.

Footnote F2

The price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.05 to $3.19, inclusive.

Footnote F3

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