UOC
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UBS O'Connor’s Annexon ANNX Stock Holding History

UBS O'Connor’s Portfolio ANNX Stock Details ANNX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q3 		– Sell
-492,698
Closed -$1.18M – 289
2025
Q2 		$1.18M Buy
492,698
+25,879
+6% +$51.9K 0.03% 193
2025
Q1 		$901K Buy
466,819
+147,935
+46% +$492K 0.02% 193
2024
Q4 		$1.64M Sell
318,884
-1,690
-0.5% -$10.4K 0.04% 181
2024
Q3 		$1.9M Buy
320,574
+92,297
+40% +$547K 0.05% 182
2024
Q2 		$1.12M Sell
228,277
-20,000
-8% -$103K 0.03% 281
2024
Q1 		$1.78M Sell
248,277
-444,651
-64% -$2.31M 0.05% 190
2023
Q4 		$3.15M Buy
692,928
+143,682
+26% +$356K 0.1% 113
2023
Q3 		$1.3M Buy
549,246
+123,690
+29% +$374K 0.02% 300
2023
Q2 		$1.5M Buy
425,556
+258,649
+155% +$1.13M 0.03% 339
2023
Q1 		$643K Buy
166,907
+7,948
+5% +$43.7K 0.02% 446
2022
Q4 		$822K Buy
158,959
+37,202
+31% +$204K 0.02% 584
2022
Q3 		$752K Sell
121,757
-10,093
-8% -$54.6K 0.01% 772
2022
Q2 		$497K Sell
131,850
-125,150
-49% -$382K 0.01% 816
2022
Q1 		$702K Buy
+257,000
New +$1.58M 0.01% 731

Other funds holding ANNX

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BI
BVF Inc San Francisco, California $3.91B AUM 304.52% 1-Year Est. Return
RG
Redmile Group San Francisco, California $1.49B AUM 208.7% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return
BG
Bellevue Group Kuesnacht, Switzerland $4.75B AUM 68.58% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
WP
Woodline Partners San Francisco, California $32.4B AUM 58.5% 1-Year Est. Return

UBS O'Connor's ANNX Position: Q3 2025 in Review

UBS O'Connor sold out of Annexon (ANNX) in Q3 2025, closing a stake of 492,698 shares — an estimated $1.18M sold.

UBS O'Connor first reported a position in ANNX in Q1 2022 and held it in 14 quarters. The position peaked at $3.15M in Q4 2023. 144 funds tracked by Wall St. Rank hold ANNX as of Q3 2025.

  • UBS O'Connor reported no remaining Annexon position as of Q3 2025 after selling out during the quarter.
  • UBS O'Connor sold 492,698 Annexon shares in Q3 2025, an estimated $1.18M.
  • UBS O'Connor first reported a position in Annexon in Q1 2022 and held it in 14 quarters.
  • UBS O'Connor's Annexon position peaked at $3.15M in Q4 2023.
  • 144 funds tracked by Wall St. Rank held Annexon as of Q3 2025.

Based on UBS O'Connor's 13F filing for Q3 2025, filed 14 Nov 2025.