Anderson Karen M. 4

What Happened

• Karen M. Anderson, Chief People Officer at Centessa Pharmaceuticals (CNTA), exercised 109,398 stock options (code M) on 2026-03-13 at $4.01 per share (total cost ~$438,686) and sold a total of 120,029 shares in open-market transactions the same day for aggregate proceeds of about $3,150,673.
• The sales were two blocks: 107,961 shares at a weighted average $26.15 (≈ $2,823,234) and 12,068 shares at a weighted average $27.13 (≈ $327,439). A separate derivative disposition line shows 109,398 shares at $0.00, reflecting the option conversion/settlement.

Key Details

• Transaction date: March 13, 2026.
• Option exercise: 109,398 shares acquired at $4.01 each (total ~$438,686).
• Open-market sales: 107,961 shares @ weighted avg $26.15 (prices in range $25.75–$26.705) and 12,068 shares @ weighted avg $27.13 (prices in range $26.805–$27.455).
• Total proceeds from sales: ≈ $3.15 million.
• Sales effected pursuant to a Rule 10b5-1 trading plan adopted November 12, 2025 (footnote F2).
• Footnote: Ordinary shares may be represented by American Depositary Shares (ADS), each currently representing one Ordinary Share (F1).
• Shares owned after transaction: not stated in the provided filing excerpt.
• Filing timeliness: report filed the same day (2026-03-13), no late filing indicated.

Context

• The combination of an exercise (acquiring shares by paying the exercise price) and same-day open-market sales is consistent with an exercise followed by disposition of the resulting shares; this can function similarly to a cashless exercise but the Form 4 reports the exercise and the separate market sales. The reported sales were made under a pre-established 10b5-1 plan, which is a planned trading arrangement that can help insiders avoid claims of opportunistic timing.