WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in VRTX — Vertex Pharmaceuticals Inc / Ma

CIK 1644956 CHICAGO, IL

Position in VRTX

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$15,980,797

-$1,678,520 QoQ

Shares Held

32,172

-18.6% QoQ

Ownership

0.013%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

#285

of 1,735 holders

Holding Since

Sep 2024

8 quarters on record

Voting authority Sole 82% Shared 0% None 18%

Healthcare · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,561,504,374 across 14 Biotechnology names. VRTX ranks #11 (1.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ARGX	Argenx SE	264,617	$245,503,714
2	KRYS	Krystal Biotech, Inc.	570,153	$211,908,765
3	HALO	Halozyme Therapeutics, Inc.	2,511,050	$196,539,883
4	MDGL	Madrigal Pharmaceuticals, Inc.	324,123	$174,037,844
5	MIRM	Mirum Pharmaceuticals, Inc.	1,404,741	$164,453,028
6	PTCT	Ptc Therapeutics, Inc.	1,722,688	$140,519,660
7	CYTK	Cytokinetics Inc	1,603,442	$136,597,223
8	JAZZ	Jazz Pharmaceuticals plc	436,893	$105,278,106

8 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$15,980,797	32,172	-18.6%	Shares	Sole	2026-08-12
2026-03-31	$17,659,317	39,547	-0.5%	Shares	Sole	2026-05-08
2025-12-31	$18,014,259	39,735	+6566.9%	Shares	Sole	2026-02-09
2025-09-30	$233,417	596	-97.4%	Shares	Sole	2025-11-12
2025-06-30	$10,065,081	22,608	-71.5%	Shares	Sole	2025-07-29
2025-03-31	$38,461,740	79,332	+2.3%	Shares	Sole	2025-05-09
2024-12-31	$31,222,136	77,532	+1.3%	Shares	Sole	2025-02-10
2024-09-30	$35,601,408	76,549	—	Shares	Sole	2024-11-08
No filing history on record for this holder in this stock.