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Custom Index Systems’s argenx ARGX Stock Holding History

Custom Index Systems’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
2026
Q1 		$224K Sell
307
-310
-50% -$243K 0.1% 231
2025
Q4 		$519K Sell
617
-320
-34% -$274K 0.23% 127
2025
Q3 		$691K Sell
937
-228
-20% -$150K 0.21% 129
2025
Q2 		$642K Sell
1,165
-983
-46% -$570K 0.31% 93
2025
Q1 		$1.27M Buy
+2,148
New +$1.36M 0.64% 30

Other funds holding ARGX

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
ACA
Avoro Capital Advisors New York $10.2B AUM 149.19% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

Custom Index Systems's ARGX Position: Q1 2026 in Review

Custom Index Systems reduced its argenx (ARGX) stake by 50% in Q1 2026, selling an estimated $243K and leaving 307 shares worth $224K. The position accounts for 0.1% of the portfolio, ranked #231.

Custom Index Systems first reported a position in ARGX in Q1 2025 and has held it in 5 quarters since. The position peaked at $1.27M in Q1 2025. 475 funds tracked by Wall St. Rank hold ARGX as of Q1 2026.

  • Custom Index Systems held 307 shares of argenx worth $224K as of Q1 2026.
  • Custom Index Systems sold 310 argenx shares in Q1 2026, an estimated $243K.
  • argenx made up 0.1% of Custom Index Systems's portfolio in Q1 2026, its #231 holding.
  • Custom Index Systems first reported a position in argenx in Q1 2025 and has held it in 5 quarters since.
  • Custom Index Systems's argenx position peaked at $1.27M in Q1 2025.
  • 475 funds tracked by Wall St. Rank held argenx as of Q1 2026.

Based on Custom Index Systems's 13F filing for Q1 2026, filed 29 Apr 2026.