AC Immune S.A.
AC Immune S.A. (ACIU) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ACIU · as of Sep 30, 2025
Ownership Breakdown
42
Institutional Holders
$71.15M
Total Inst. Value
▲ $21.43M vs Q2
101.77M
Shares Outstanding
freeFloat 61.58%
24.62M
13F Shares Held
▲ 122,005 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ACIU largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BVF INC/IL pharmaceutical preparations | 19.82M | 19.70% | 19.70% | $57.29B | Nov 14, 2025 | — held |
WELLS FARGO & COMPANY/MN pharmaceutical preparations | 1.01M | 1.00% | 1.00% | $2.92B | Nov 13, 2025 | ▼ 14.1K |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 894.5K | 88.89% | 88.89% | $2.59B | Nov 14, 2025 | ▲ 603.0K |
RENAISSANCE TECHNOLOGIES LLC pharmaceutical preparations | 770.4K | 76.56% | 76.56% | $2.23B | Nov 13, 2025 | ▼ 57.9K |
ACADIAN ASSET MANAGEMENT LLC pharmaceutical preparations | 413.2K | 41.06% | 41.06% | $1.18B | Nov 13, 2025 | ▲ 1.5K |
BLACKROCK, INC. pharmaceutical preparations | 411.8K | 40.93% | 40.93% | $1.19B | Nov 12, 2025 | ▲ 541 |
NORTHERN TRUST CORP pharmaceutical preparations | 282.0K | 28.02% | 28.02% | $814.84M | Nov 14, 2025 | ▼ 99.4K |
DEUTSCHE BANK AG\ pharmaceutical preparations | 253.4K | 25.18% | 25.18% | $732.25M | Nov 13, 2025 | — held |
ASSENAGON ASSET MANAGEMENT S.A. pharmaceutical preparations | 189.9K | 18.87% | 18.87% | $548.79M | Oct 7, 2025 | NEW |
DIMENSIONAL FUND ADVISORS LP pharmaceutical preparations | 177.1K | 17.60% | 17.60% | $513.33M | Nov 12, 2025 | ▼ 21.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
13
Increased
+638.9K shares6
New Positions
first time holders13
Decreased
−361.1K shares6
Sold Out
fully exitedNet shares change (top 50)
+277.7K
+638.9K / −361.1K
Net new holders
+0
6 new / 6 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ACIU insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
2
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Pfeifer Andrea Chief Executive Officer | May 15, 2026 | Sale | 10,000 | $2.79 | $27.9K | 3.82M | Form 4 ↗ |
Pfeifer Andrea Chief Executive Officer | Apr 15, 2026 | Sale | 10,000 | $3.14 | $31.4K | 3.83M | Form 4 ↗ |
Pfeifer Andrea Chief Executive Officer | Apr 15, 2026 | Purchase | 10,000 | $3.14 | $31.4K | 3.83M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
AC Immune S.A. (ACIU) is primarily owned by institutional investors, who hold approximately 24.2% of total shares outstanding. Company insiders own approximately 38.42%, while retail and public investors account for the remaining 37.39%.
The largest institutional shareholder of AC Immune S.A. is BVF INC/IL, holding approximately 19.82 million shares — equal to 19.70% of outstanding shares — as of September 30, 2025.
A total of 42 institutional investors currently hold ACIU stock, with a combined institutional value of approximately $71,148,777 as of the most recent 13F filing period.
Frequently asked questions
ACIU ownershipAC Immune S.A. (ACIU) is primarily owned by institutional investors, who hold approximately 24.2% of shares. The largest shareholder is BVF INC/IL with a 19.70% stake. Company insiders hold 38.42%. Data sourced from SEC Form 13F as of September 30, 2025.