Rock Springs Capital Management LP

Position in XENE — Xenon Pharmaceuticals Inc.

CIK 1595725 Baltimore, MD

Back to XENE Full portfolio

Position in XENE

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$41,280,626

-$3,088,987 QoQ

Shares Held

683,907

-10.4% QoQ

Ownership

0.706%

of shares outstanding

% of Portfolio

2.01%

of 13F equity value

Holder Rank

#37

of 314 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in XENE Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. XENE ranks #9 (2.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	RVMD	Revolution Medicines, Inc.	1,105,210	$206,983,728
2	TVTX	Travere Therapeutics, Inc.	2,179,069	$123,792,909
3	MDGL	Madrigal Pharmaceuticals, Inc.	174,999	$93,965,713
4	MIRM	Mirum Pharmaceuticals, Inc.	798,145	$93,438,835
5	RYTM	Rhythm Pharmaceuticals, Inc.	692,598	$76,899,155
6	KYMR	Kymera Therapeutics, Inc.	453,156	$51,963,398
7	ARGX	Argenx SE	52,750	$48,939,867
8	ASND	Ascendis Pharma A/S	168,750	$45,009,000

All Filings in XENE

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26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$41,280,626	683,907	-10.4%	Shares	Sole	2026-08-14
2026-03-31	$44,369,613	763,020	-3.1%	Shares	Sole	2026-05-15
2025-12-31	$35,308,658	787,788	-7.5%	Shares	Sole	2026-02-17
2025-09-30	$34,197,521	851,744	-8.6%	Shares	Sole	2025-11-14
2025-06-30	$29,161,615	931,681	0.0%	Shares	Sole	2025-08-14
2025-03-31	$31,257,897	931,681	-25.6%	Shares	Sole	2025-05-15
2024-12-31	$49,072,872	1,251,859	-4.9%	Shares	Sole	2025-02-14
2024-09-30	$51,829,699	1,316,477	+3.4%	Shares	Sole	2024-11-14
2024-06-30	$49,629,474	1,272,877	+1.4%	Shares	Sole	2024-08-14
2024-03-31	$54,052,589	1,255,577	0.0%	Shares	Sole	2024-05-15
2023-12-31	$57,831,876	1,255,577	+6.6%	Shares	Sole	2024-02-14
2023-09-30	$40,240,548	1,178,002	0.0%	Shares	Sole	2023-11-14
2023-06-30	$45,353,077	1,178,002	0.0%	Shares	Sole	2023-08-14
2023-03-31	$42,160,691	1,178,002	+0.2%	Shares	Sole	2023-05-15
2022-12-31	$46,356,746	1,175,672	+1.7%	Shares	Sole	2023-02-14
2022-09-30	$41,730,192	1,155,961	+2.9%	Shares	Sole	2022-11-14
2022-06-30	$34,180,033	1,123,604	+33.4%	Shares	Sole	2022-08-15
2022-03-31	$25,755,163	842,498	+9.2%	Shares	Sole	2022-05-16
2021-12-31	$24,097,505	771,367	+32.3%	Shares	Sole	2022-02-14
2021-09-30	$8,909,768	583,100	+1.9%	Shares	Sole	2021-11-15
2021-06-30	$10,659,950	572,500	0.0%	Shares	Sole	2021-08-16
2021-03-31	$10,247,750	572,500	+11.2%	Shares	Sole	2021-05-17
2020-12-31	$7,920,700	515,000	-0.1%	Shares	Sole	2021-02-16
2020-09-30	$5,708,920	515,711	0.0%	Shares	Sole	2020-11-16
2020-06-30	$6,467,015	515,711	+3.1%	Shares	Sole	2020-08-14
2020-03-31	$5,670,000	500,000	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.