Pfeifer Andrea 4

What Happened
Andrea Pfeifer, Chief Executive Officer of AC Immune SA (ACIU), sold 10,000 common shares in an open‑market transaction on May 15, 2026. The reported weighted average price was $2.79 per share (range $2.75–$2.825), for total proceeds of $27,935. This was a sale (S), which is often routine insider selling and does not by itself indicate a change in company outlook.

Key Details

• Transaction date: May 15, 2026 (reported on Form 4 filed May 18, 2026) — filing appears timely.
• Price: Weighted average $2.79; reported price range $2.75 to $2.825 (footnote F1).
• Shares sold: 10,000; Proceeds: $27,935.
• Shares owned after transaction: not explicitly stated in the summary provided; filing footnote F2 notes holdings include 1,921,005 common shares underlying outstanding restricted share units.
• Footnotes: F1 explains the weighted average and multiple trade prices and offers to provide full breakdown on request; F2 discloses RSUs included in holdings.
• Transaction type: Open‑market sale (Form 4 code S).

Context
Sales by executives can be for many reasons (liquidity, diversification, tax obligations) and are not necessarily a signal about company fundamentals. This filing reports a straightforward open‑market sale; there is no indication in the filing of an option exercise, 10b5‑1 trading plan, or gifting related to this transaction.