AC Immune SA (ACIU) Institutional Ownership

Ownership Summary

The institutional landscape for AC Immune SA (NASDAQ:ACIU) includes 40 filers as of the latest reporting cycle ending September 2025.

• AC Immune saw its institutional ownership percentage rose to 24.6% in September 2025 from 24.3% in June 2025.
• Institutional share ownership changed by 1.27% QoQ, while the number of institutional owners saw a decrease of 4.76% YoY.
• Of these 40 institutional investors, 16 increased their holdings in AC Immune, while 14 of them reduced positions, and 10 investors maintained their exposure.
• The aggregate institutional position in AC Immune now stands at 24.72Mn shares as of September 2025, after investors increased their holdings (up by 310.08K shares quarter on quarter which is down 3.42Mn shares year over year).
• The top institutional stake in AC Immune as of September 30, 2025 belongs to BVF INC/IL, which owns 19.82Mn shares, or 19.70% of the company.
• Among the most significant buyers of AC Immune during September 2025 were MILLENNIUM MANAGEMENT LLC (697.90K), MORGAN STANLEY (19.14K), Private Advisor Group, LLC (16.60K), UBS Group AG (8.96K), SIMPLEX TRADING, LLC (2.94K).
• Leading sellers of AC Immune stock in September 2025 included CITADEL ADVISORS LLC (131.35K), NORTHERN TRUST CORP (99.40K), RENAISSANCE TECHNOLOGIES LLC (57.90K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (49.65K), Assenagon Asset Management S.A. (33.99K).
• The top 10 institutional holders of AC Immune for the quarter ending September 2025 included BVF INC/IL (19.82Mn), WELLS FARGO & COMPANY/MN (1.01Mn), MILLENNIUM MANAGEMENT LLC (989.43K), RENAISSANCE TECHNOLOGIES LLC (770.42K), ACADIAN ASSET MANAGEMENT LLC (413.24K), BlackRock, Inc. (411.85K), NORTHERN TRUST CORP (281.95K), DEUTSCHE BANK AG\ (253.38K), Assenagon Asset Management S.A. (189.89K), DIMENSIONAL FUND ADVISORS LP (177.11K).