WESTFIELD CAPITAL MANAGEMENT CO LP

Position in VRTX — Vertex Pharmaceuticals Inc / Ma

CIK 1177719 BOSTON, MA

Position in VRTX

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

Position Value

$1,087,341

+$701,531 QoQ

Shares Held

2,189

+153.4% QoQ

Ownership

0.001%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#823

of 1,735 holders

Holding Since

Mar 2020

10 quarters on record

Voting authority Sole 68% Shared 0% None 32%

Healthcare · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $3,083,455,798 across 23 Biotechnology names. VRTX ranks #21 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ASND	Ascendis Pharma A/S	4,798,267	$1,279,793,774
2	RYTM	Rhythm Pharmaceuticals, Inc.	2,208,595	$245,220,302
3	ABVX	Abivax S.A.	1,309,825	$174,547,279
4	INSM	INSMED Inc	1,629,561	$173,743,793
5	PTCT	Ptc Therapeutics, Inc.	1,956,156	$159,563,644
6	PCVX	Vaxcyte, Inc.	2,472,428	$143,722,239
7	LEGN	Legend Biotech Corp	4,430,063	$127,940,219
8	RVMD	Revolution Medicines, Inc.	600,821	$112,521,756

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$1,087,341	2,189	+153.4%	Shares	Sole	2026-08-12
2026-03-31	$385,810	864	-23.7%	Shares	Sole	2026-05-11
2025-12-31	$513,203	1,132	-35.0%	Shares	Sole	2026-02-11
2024-12-31	$701,503	1,742	+36.9%	Shares	Sole	2025-02-11
2024-09-30	$591,581	1,272	+133.8%	Shares	Sole	2024-11-12
2024-06-30	$254,983	544	-99.9%	Shares	Sole	2024-08-14
2020-12-31	$154,308,749	652,910	+9.5%	Shares	Sole	2021-02-12
2020-09-30	$162,313,865	596,479	+11.8%	Shares	Sole	2020-11-13
2020-06-30	$154,903,029	533,578	-15.0%	Shares	Sole	2020-08-13
2020-03-31	$149,311,245	627,490	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.