Rock Springs Capital Management LP

Position in ZBIO — Zenas BioPharma, Inc.

CIK 1595725 Baltimore, MD

Position in ZBIO

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

Position Value

$12,742,714

+$2,927,109 QoQ

Shares Held

502,077

0.0% QoQ

Ownership

0.770%

of shares outstanding

% of Portfolio

0.62%

of 13F equity value

Holder Rank

#26

of 145 holders

Holding Since

Sep 2024

8 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. ZBIO ranks #36 (0.8% 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

8 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$12,742,714	502,077	0.0%	Shares	Sole	2026-08-14
2026-03-31	$9,815,605	502,077	0.0%	Shares	Sole	2026-05-15
2025-12-31	$18,230,415	502,077	-13.5%	Shares	Sole	2026-02-17
2025-09-30	$12,891,029	580,677	-9.3%	Shares	Sole	2025-11-14
2025-06-30	$6,206,125	640,467	-27.1%	Shares	Sole	2025-08-14
2025-03-31	$6,941,469	878,667	0.0%	Shares	Sole	2025-05-15
2024-12-31	$7,196,282	878,667	0.0%	Shares	Sole	2025-02-14
2024-09-30	$14,867,045	878,667	—	Shares	Sole	2024-11-14
No filing history on record for this holder in this stock.