Rock Springs Capital Management’s argenx ARGX Stock Holding History

Rock Springs Capital Management’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 Q2	$48.9M	Sell	52,750 -45,750	-46%	-$37.7M	2.39%	8
2026 Q1	$71.9M	Sell	98,500 -4,750	-5%	-$3.72M	4.24%	5
2025 Q4	$86.8M	Sell	103,250 -39,500	-28%	-$33.8M	4.45%	3
2025 Q3	$105M	Sell	142,750 -33,000	-19%	-$21.8M	6.15%	1
2025 Q2	$96.9M	Hold	175,750	–	–	6.04%	1
2025 Q1	$104M	Sell	175,750 -53,850	-23%	-$34M	5.95%	1
2024 Q4	$141M	Sell	229,600 -3,900	-2%	-$2.29M	5.38%	1
2024 Q3	$127M	Buy	233,500 +4,250	+2%	+$2.15M	4.12%	3
2024 Q2	$98.6M	Hold	229,250	–	–	2.97%	6
2024 Q1	$90.3M	Hold	229,250	–	–	2.29%	10
2023 Q4	$87.2M	Sell	229,250 -29,750	-11%	-$13.9M	2.15%	14
2023 Q3	$127M	Sell	259,000 -91,000	-26%	-$44.5M	3.41%	6
2023 Q2	$136M	Hold	350,000	–	–	3.25%	6
2023 Q1	$130M	Hold	350,000	–	–	3.11%	5
2022 Q4	$133M	Hold	350,000	–	–	3.19%	6
2022 Q3	$124M	Hold	350,000	–	–	3.19%	5
2022 Q2	$133M	Hold	350,000	–	–	3.86%	4
2022 Q1	$110M	Buy	350,000 +35,000	+11%	+$10.2M	2.78%	6
2021 Q4	$110M	Hold	315,000	–	–	2.55%	9
2021 Q3	$95.1M	Hold	315,000	–	–	2%	11
2021 Q2	$94.8M	Buy	315,000 +15,000	+5%	+$4.27M	1.87%	12
2021 Q1	$82.6M	Buy	300,000 +12,500	+4%	+$3.95M	1.8%	17
2020 Q4	$84.6M	Hold	287,500	–	–	1.79%	11
2020 Q3	$75.5M	Hold	287,500	–	–	1.92%	9
2020 Q2	$64.8M	Buy	287,500 +40,000	+16%	+$7.1M	1.78%	9
2020 Q1	$32.6M	Hold	247,500	–	–	1.35%	26
2019 Q4	$39.7M	Buy	247,500 +65,800	+36%	+$8.9M	1.26%	22
2019 Q3	$20.7M	Hold	181,700	–	–	0.83%	44
2019 Q2	$25.7M	Hold	181,700	–	–	0.93%	39
2019 Q1	$22.7M	Buy	181,700 +3,700	+2%	+$435K	0.87%	39
2018 Q4	$17.1M	Buy	178,000 +13,000	+8%	+$1.16M	0.81%	38
2018 Q3	$12.5M	Buy	165,000 +36,250	+28%	+$3.21M	0.45%	71
2018 Q2	$10.7M	Buy	+128,750	New	+$11.5M	0.41%	80

Other funds holding ARGX

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Jupiter Topco New York $245B AUM

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return

ACA

Avoro Capital Advisors New York $11.1B AUM 207.82% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Rock Springs Capital Management's ARGX Position: Q2 2026 in Review

Rock Springs Capital Management reduced its argenx (ARGX) stake by 46% in Q2 2026, selling an estimated $37.7M and leaving 52,750 shares worth $48.9M. The position accounts for 2.39% of the portfolio, ranked #8.

Rock Springs Capital Management first reported a position in ARGX in Q2 2018 and has held it in 33 quarters since. The position peaked at $141M in Q4 2024. 506 funds tracked by Wall St. Rank hold ARGX as of Q2 2026.

Rock Springs Capital Management held 52,750 shares of argenx worth $48.9M as of Q2 2026.
Rock Springs Capital Management sold 45,750 argenx shares in Q2 2026, an estimated $37.7M.
argenx made up 2.39% of Rock Springs Capital Management's portfolio in Q2 2026, its #8 holding.
Rock Springs Capital Management first reported a position in argenx in Q2 2018 and has held it in 33 quarters since.
Rock Springs Capital Management's argenx position peaked at $141M in Q4 2024.
506 funds tracked by Wall St. Rank held argenx as of Q2 2026.

Based on Rock Springs Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.