Vault-13

AC IMMUNE SA ACIU

SHS · Common Stock · CUSIP H00263105

43 institutional holders -3 vs Q1 2026
24,469,71924.5m shares reported held*
$58.2mreported value*
6 new 10 added 16 reduced 8 sold out net sold ≈ $1.2m (-503.0k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $2.38. Options: 4 managers hold calls ($212.1k notional), 4 hold puts ($282.5k).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q3 22: 35Q4 22: 38Q1 23: 35Q2 23: 32Q3 23: 29Q4 23: 33Q1 24: 38Q2 24: 46Q3 24: 44Q4 24: 46Q1 25: 43Q2 25: 43Q3 25: 40Q4 25: 42Q1 26: 46Q2 26: 4343Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202235
Q4 202238
Q1 202335
Q2 202332
Q3 202329
Q4 202333
Q1 202438
Q2 202446
Q3 202444
Q4 202446
Q1 202543
Q2 202543
Q3 202540
Q4 202542
Q1 202646
Q2 202643

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q3 24: 13 bought or addedQ3 24: 25 cut or sold outQ4 24: 21 bought or addedQ4 24: 21 cut or sold outQ4 24Q1 25: 19 bought or addedQ1 25: 22 cut or sold outQ2 25: 21 bought or addedQ2 25: 15 cut or sold outQ2 25Q3 25: 17 bought or addedQ3 25: 19 cut or sold outQ4 25: 19 bought or addedQ4 25: 17 cut or sold outQ4 25Q1 26: 21 bought or addedQ1 26: 20 cut or sold outQ2 26: 16 bought or addedQ2 26: 24 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20241325
Q4 20242121
Q1 20251922
Q2 20252115
Q3 20251719
Q4 20251917
Q1 20262120
Q2 20261624

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$500k$1m$1.5m$2mQ3 25 calls: $293.3kQ3 25 puts: $86.7kQ3 25P/C 0.30Q4 25 calls: $1.1mQ4 25 puts: $118.7kQ4 25P/C 0.11Q1 26 calls: $1.6mQ1 26 puts: $126.0kQ1 26P/C 0.08Q2 26 calls: $212.1kQ2 26 puts: $282.5kQ2 26P/C 1.33
Numbers
QuarterCallsPutsP/C
Q3 2025$293.3k$86.7k0.30
Q4 2025$1.1m$118.7k0.11
Q1 2026$1.6m$126.0k0.08
Q2 2026$212.1k$282.5k1.33

Biggest buyers

RENAISSANCE TECHNOLOGIES LLC Added +215,760+215.8k
Qube Research & Technologies Ltd New +92,351+92.4k
TWO SIGMA INVESTMENTS, LP Added +63,734+63.7k
MORGAN STANLEY Added +42,562+42.6k
Verdad Advisers, LP New +16,300+16.3k
Quadrature Capital Ltd New +12,991+13.0k
Jump Financial, LLC Added +12,939+12.9k
AXQ CAPITAL, LP New +10,398+10.4k
SG Americas Securities, LLC New +10,327+10.3k
BARCLAYS PLC Added +1,487+1.5k

Biggest sellers

NORTHERN TRUST CORP Sold out -278,513-278.5k
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Reduced -172,705-172.7k
MARSHALL WACE, LLP Sold out -131,458-131.5k
ACADIAN ASSET MANAGEMENT LLC Sold out -96,907-96.9k
CITADEL ADVISORS LLC Reduced -59,627-59.6k
DIMENSIONAL FUND ADVISORS LP Reduced -50,083-50.1k
JANE STREET GROUP, LLC Reduced -38,221-38.2k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -35,893-35.9k
MILLENNIUM MANAGEMENT LLC Reduced -19,063-19.1k
BANK OF AMERICA CORP /DE/ Sold out -17,437-17.4k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $85.2k35.8k shares
SIMPLEX TRADING, LLC Reduced $73.3k30.8k shares
CITADEL ADVISORS LLC Reduced $27.4k11.5k shares
GROUP ONE TRADING LLC Reduced $26.2k11.0k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $166.4k69.9k shares
CITADEL ADVISORS LLC Added $81.6k34.3k shares
SIMPLEX TRADING, LLC Added $32.4k13.6k shares
GROUP ONE TRADING LLC Reduced $2.1k900 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 1 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20250—0——
Q1 20260—0——
Q2 20260—1$59.3k$59.3k
Q3 20260—0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-05-15 Pfeifer Andrea Chief Executive Officer, director Sold plan 10,000 $2.79 $27.9k10.0k shares -<1%
2026-04-15 Pfeifer Andrea Chief Executive Officer, director · Share Sold plan 10,000 $3.14 $31.4k10.0k shares -<1%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 BVF INC/IL 1.21% of their portfolio San Francisco, CA 19,822,43619.8m $47.2m $47.2m 1.21% Unchanged
2 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 1,004,0411.0m $2.4m $2.4m 0.00% Reduced -243 -243
3 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 840,127840.1k $2.0m $2.0m 0.00% Added +215.8k +215,760
4 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 773,594773.6k $1.8m $1.8m 0.00% Reduced -19.1k -19,063
5 BlackRock, Inc. 0.00% of their portfolio New York, NY 519,274519.3k $1.2m $1.2m 0.00% Reduced -5.0k -5,004
6 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 340,082340.1k $812.1k $812.1k 0.00% Reduced -50.1k -50,083
7 ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio BOSTON, MA 232,953233.0k $554.4k $554.4k 0.00% Reduced -172.7k -172,705
8 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 207,606207.6k $494.1k $494.1k 0.00% Reduced -59.6k -59,627
9 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 131,815131.8k $313.7k $313.7k 0.00% Added +42.6k +42,562
10 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 102,825102.8k $244.7k $244.7k 0.00% Added +63.7k +63,734
11 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 92,35192.4k $219.8k $219.8k 0.00% New
12 UBS Group AG 0.00% of their portfolio ZURICH, V8 85,61485.6k $203.8k $203.8k 0.00% Reduced -16.0k -16,015
13 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 61,85461.9k $147.2k $147.2k 0.00% Reduced -1.7k -1,747
14 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 53,36953.4k $127.0k $127.0k 0.00% Reduced -35.9k -35,893
15 Jump Financial, LLC 0.00% of their portfolio Chicago, IL 24,06424.1k $57.3k $57.3k 0.00% Added +12.9k +12,939
16 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 19,47519.5k $46.4k $46.4k 0.00% Reduced -38.2k -38,221
17 Verdad Advisers, LP 0.04% of their portfolio BOSTON, MA 16,30016.3k $38.8k $38.8k 0.04% New
18 China Universal Asset Management Co., Ltd. 0.00% of their portfolio SHANGHAI, F4 16,19716.2k $38.5k $38.5k 0.00% Reduced -1.7k -1,655
19 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 14,49714.5k $34.5k $34.5k 0.00% Reduced -7.1k -7,135
20 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 12,99113.0k $30.9k $30.9k 0.00% New
21 AXQ CAPITAL, LP 0.00% of their portfolio JERSEY CITY, NJ 10,39810.4k $24.7k $24.7k 0.00% New
22 SG Americas Securities, LLC 0.00% of their portfolio NEW YORK, NY 10,32710.3k $25.0k $25.0k 0.00% New
23 Quinn Opportunity Partners LLC 0.00% of their portfolio CHARLOTTESVILLE, VA 10,10010.1k $24.0k $24.0k 0.00% Unchanged
24 Silverberg Bernstein Capital Management LLC 0.01% of their portfolio ARMONK, NY 10,00010.0k $23.8k $23.8k 0.01% Unchanged
25 EFG International AG 0.00% of their portfolio Zurich, V8 9,9009.9k $23.6k $23.6k 0.00% Unchanged
26 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 7,7987.8k $20.7k $20.7k 0.00% Added +158 +158
27 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 7,2787.3k $17.3k $17.3k 0.00% Added +1.5k +1,487
28 Banque Cantonale Vaudoise 0.00% of their portfolio LAUSANNE, V8 7,0217.0k $17.0k $17.0k 0.00% Unchanged
29 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 4,5524.6k $10.8k $10.8k 0.00% Reduced -695 -695
30 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 4,1014.1k $9.8k $9.8k 0.00% Reduced -2.9k -2,908
31 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 4,0124.0k $9.5k $9.5k 0.00% Added +1.2k +1,201
32 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 2,6992.7k $6.4k $6.4k 0.00% Added +289 +289
33 GF FUND MANAGEMENT CO. LTD. 0.00% of their portfolio GUANGZHOU, F4 2,0842.1k $5.0k $5.0k 0.00% Reduced -158 -158
34 Forum Finance Group S.A. 0.00% of their portfolio GENEVA, V8 2,0002.0k $4.0k $4.0k 0.00% Unchanged
35 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 1,2891.3k $3.0k $3.0k 0.00% Added +429 +429
36 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1,1971.2k $2.8k $2.8k 0.00% New
37 PNC Financial Services Group, Inc. 0.00% of their portfolio Pittsburgh, PA 1,0001.0k $2.4k $2.4k 0.00% Unchanged
38 Rockefeller Capital Management L.P. 0.00% of their portfolio NEW YORK, NY 1,0001.0k $2.4k $2.4k 0.00% Unchanged
39 Activest Wealth Management 0.00% of their portfolio AVENTURA, FL 1,0001.0k $2.4k $2.4k 0.00% Unchanged
40 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 220220 $523 $523 0.00% Reduced -1 -1
41 Strengthening Families & Communities, LLC 0.00% of their portfolio BOSTON, MA 200200 $476 $476 0.00% Unchanged
42 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 4343 $102 $102 0.00% Unchanged
43 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 3535 $83 $83 0.00% Added +32 +32