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UBS O'Connor’s argenx ARGX Stock Holding History

UBS O'Connor’s Portfolio ARGX Stock Details ARGX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q3 		– Sell
-2,191
Closed -$1.21M – 291
2025
Q2 		$1.21M Buy
+2,191
New +$1.27M 0.03% 191
2025
Q1 		– Sell
-610
Closed -$375K – 340
2024
Q4 		$375K Sell
610
-1,390
-70% -$814K 0.01% 302
2024
Q3 		$1.08M Buy
+2,000
New +$1.01M 0.03% 269

Other funds holding ARGX

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
ACA
Avoro Capital Advisors New York $11.1B AUM 207.82% 1-Year Est. Return
ClearBridge Investments
ClearBridge Investments New York $121B AUM 27.52% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return

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

UBS O'Connor sold out of argenx (ARGX) in Q3 2025, closing a stake of 2,191 shares — an estimated $1.21M sold.

UBS O'Connor first reported a position in ARGX in Q3 2024 and held it in 3 quarters. The position peaked at $1.21M in Q2 2025. 469 funds tracked by Wall St. Rank hold ARGX as of Q3 2025.

  • UBS O'Connor reported no remaining argenx position as of Q3 2025 after selling out during the quarter.
  • UBS O'Connor sold 2,191 argenx shares in Q3 2025, an estimated $1.21M.
  • UBS O'Connor first reported a position in argenx in Q3 2024 and held it in 3 quarters.
  • UBS O'Connor's argenx position peaked at $1.21M in Q2 2025.
  • 469 funds tracked by Wall St. Rank held argenx as of Q3 2025.

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