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
2024
Q2 		– Sell
-418,500
Closed -$532K – 544
2024
Q1 		$532K Buy
+418,500
New +$2.17M 0.02% 330
2023
Q4 		– Sell
-300,000
Closed -$30K – 516
2023
Q3 		$30K Sell
300,000
-50,000
-14% -$151K ﹤0.01% 499
2023
Q2 		$91.3K Buy
+350,000
New +$1.53M ﹤0.01% 495

Other funds holding ANNX

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BI
BVF Inc San Francisco, California $3.14B AUM 249.53% 1-Year Est. Return
RG
Redmile Group San Francisco, California $1.51B AUM 164.17% 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 $1.11B AUM 171.34% 1-Year Est. Return
BG
Bellevue Group Kuesnacht, Switzerland $4.2B AUM 54.85% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
WP
Woodline Partners San Francisco, California $26.4B AUM 44.85% 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 Q2 2022 and held it in 12 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 Q2 2022 and held it in 12 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.