Rock Springs Capital Management LP

Position in ARGX — Argenx SE

CIK 1595725 Baltimore, MD

Position in ARGX

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$71,929,625

-$14,898,462 QoQ

Shares Held

98,500

-4.6% QoQ

Ownership

0.158%

of shares outstanding

% of Portfolio

4.25%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

Rock Springs Capital Management LP holds $1,246,050,197 across 66 Biotechnology names. ARGX ranks #4 (5.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	RVMD	Revolution Medicines, Inc.	1,209,465	$117,620,471
2	MDGL	Madrigal Pharmaceuticals, Inc.	170,999	$89,512,846
3	MIRM	Mirum Pharmaceuticals, Inc.	811,294	$74,947,339
4	ARGX	Argenx SE This page	98,500	$71,929,625
5	RYTM	Rhythm Pharmaceuticals, Inc.	689,748	$59,987,383
6	INSM	INSMED Inc	314,300	$51,394,336
7	ASND	Ascendis Pharma A/S	194,000	$44,373,620
8	XENE	Xenon Pharmaceuticals Inc.	763,020	$44,369,613

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$71,929,625	98,500	-4.6%	Shares	Sole	2026-05-15
2025-12-31	$86,828,087	103,250	-27.7%	Shares	Sole	2026-02-17
2025-09-30	$105,286,690	142,750	-18.8%	Shares	Sole	2025-11-14
2025-06-30	$96,876,915	175,750	0.0%	Shares	Sole	2025-08-14
2025-03-31	$104,020,273	175,750	-23.5%	Shares	Sole	2025-05-15
2024-12-31	$141,204,000	229,600	-1.7%	Shares	Sole	2025-02-14
2024-09-30	$126,575,680	233,500	+1.9%	Shares	Sole	2024-11-14
2024-06-30	$98,586,670	229,250	0.0%	Shares	Sole	2024-08-14
2024-03-31	$90,260,310	229,250	0.0%	Shares	Sole	2024-05-15
2023-12-31	$87,213,577	229,250	-11.5%	Shares	Sole	2024-02-14
2023-09-30	$127,332,170	259,000	-26.0%	Shares	Sole	2023-11-14
2023-06-30	$136,405,500	350,000	0.0%	Shares	Sole	2023-08-14
2023-03-31	$130,403,000	350,000	0.0%	Shares	Sole	2023-05-15
2022-12-31	$132,590,500	350,000	0.0%	Shares	Sole	2023-02-14
2022-09-30	$123,567,500	350,000	0.0%	Shares	Sole	2022-11-14
2022-06-30	$132,608,000	350,000	0.0%	Shares	Sole	2022-08-15
2022-03-31	$110,358,500	350,000	+11.1%	Shares	Sole	2022-05-16
2021-12-31	$110,309,850	315,000	0.0%	Shares	Sole	2022-02-14
2021-09-30	$95,130,000	315,000	0.0%	Shares	Sole	2021-11-15
2021-06-30	$94,837,050	315,000	+5.0%	Shares	Sole	2021-08-16
2021-03-31	$82,617,000	300,000	+4.3%	Shares	Sole	2021-05-17
2020-12-31	$84,550,875	287,500	0.0%	Shares	Sole	2021-02-16
2020-09-30	$75,474,500	287,500	0.0%	Shares	Sole	2020-11-16
2020-06-30	$64,753,625	287,500	+16.2%	Shares	Sole	2020-08-14
2020-03-31	$32,603,175	247,500	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.