Citadel Advisors
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Citadel Advisors’s AC Immune ACIU Stock Holding History

Citadel Advisors’s Portfolio ACIU Stock Details ACIU Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$27.8K Sell
10,100
-1,300
-11% -$4.04K ﹤0.01% 12593
2025
Q4 		$35.8K Sell
11,400
-11,100
-49% -$35K ﹤0.01% 12158
2025
Q3 		$65K Sell
22,500
-6,000
-21% -$13.5K ﹤0.01% 12070
2025
Q2 		$57.9K Buy
28,500
+6,300
+28% +$11K ﹤0.01% 11695
2025
Q1 		$41.5K Buy
+22,200
New +$55.9K ﹤0.01% 12510
2024
Q4 		– Sell
-100
Closed -$378 – 14407
2024
Q3 		$378 Sell
100
-37,500
-100% -$131K ﹤0.01% 14031
2024
Q2 		$150K Buy
37,600
+5,500
+17% +$18.2K ﹤0.01% 10350
2024
Q1 		$95K Buy
32,100
+27,600
+613% +$98.9K ﹤0.01% 11430
2023
Q4 		$22.5K Buy
4,500
+4,400
+4,400% +$14.1K ﹤0.01% 12522
2023
Q3 		$285 Sell
100
-2,000
-95% -$6.09K ﹤0.01% 14096
2023
Q2 		$6.21K Buy
2,100
+1,400
+200% +$3.06K ﹤0.01% 13443
2023
Q1 		$1.64K Sell
700
-5,800
-89% -$13.4K ﹤0.01% 14264
2022
Q4 		$13.3K Buy
+6,500
New +$16.8K ﹤0.01% 13456
2022
Q1 		– Sell
-11,800
Closed -$58K – 13459
2021
Q4 		$58K Sell
11,800
-14,200
-55% -$82.5K ﹤0.01% 13163
2021
Q3 		$174K Buy
26,000
+8,000
+44% +$57.3K ﹤0.01% 12174
2021
Q2 		$143K Sell
18,000
-8,800
-33% -$60.8K ﹤0.01% 12545
2021
Q1 		$204K Buy
26,800
+12,500
+87% +$89.3K ﹤0.01% 11651
2020
Q4 		$74K Sell
14,300
-10,700
-43% -$54.6K ﹤0.01% 10387
2020
Q3 		$122K Buy
+25,000
New +$179K ﹤0.01% 9146

Other funds holding ACIU

BI
BVF Inc San Francisco, California $3.14B AUM 249.53% 1-Year Est. Return
Wells Fargo
Wells Fargo San Francisco, California $530B AUM 22.01% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $185B AUM 39.58% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
DIG
Dauntless Investment Group Etna, New Hampshire $151M AUM 76.14% 1-Year Est. Return

Citadel Advisors's ACIU Position: Q1 2026 in Review

Citadel Advisors increased its AC Immune (ACIU) stake by 276% in Q1 2026, buying an estimated $609K and bringing the position to 267,233 shares worth $735K. The position accounts for ﹤0.01% of the portfolio, ranked #8401.

Citadel Advisors first reported a position in ACIU in Q3 2016 and has held it in 31 quarters since. The position peaked at $4.85M in Q4 2016. 46 funds tracked by Wall St. Rank hold ACIU as of Q1 2026.

  • Citadel Advisors held 267,233 shares of AC Immune worth $735K as of Q1 2026.
  • Citadel Advisors bought 196,082 AC Immune shares in Q1 2026, an estimated $609K.
  • AC Immune made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #8401 holding.
  • Citadel Advisors first reported a position in AC Immune in Q3 2016 and has held it in 31 quarters since.
  • Citadel Advisors's AC Immune position peaked at $4.85M in Q4 2016.
  • 46 funds tracked by Wall St. Rank held AC Immune as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.