ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Position in WST — West Pharmaceutical Services Inc

CIK 1164508 BOSTON, MA

Back to WST Full portfolio

Position in WST

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$127,955,730

+$45,302,574 QoQ

Shares Held

510,516

+69.9% QoQ

Ownership

0.723%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

17 quarters on record

Voting authority Sole 84.24985700741995.ToString("F0")% Shared 0.ToString("F0")% None 15.750142992580058.ToString("F0")%

Common Shares in WST Over Time

Shares Held

Position Value (USD)

Position in Medical Instruments & Supplies

Healthcare · as of Mar 31, 2026

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $2,224,765,254 across 22 Medical Instruments & Supplies names. WST ranks #6 (5.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ISRG	Intuitive Surgical Inc	2,105,544	$970,634,728
2	HOLX	HOLOGIC INC	2,921,130	$220,808,216
3	ALGN	Align Technology Inc	1,054,633	$180,795,735
4	BDX	Becton Dickinson & Co	1,002,375	$157,603,421
5	COO	Cooper Companies, Inc.	2,126,300	$152,030,450
6	WST	West Pharmaceutical Services Inc This page	510,516	$127,955,730
7	RMD	Resmed Inc	450,250	$101,072,120
8	TFX	Teleflex Inc	638,761	$76,402,203

All Filings in WST

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17 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$127,955,730	510,516	+69.9%	Shares	Defined	2026-05-14
2025-12-31	$82,653,156	300,404	+36.0%	Shares	Defined	2026-02-13
2025-09-30	$57,965,486	220,964	+71.3%	Shares	Defined	2025-11-13
2025-06-30	$28,231,764	129,030	+212.0%	Shares	Defined	2025-08-13
2025-03-31	$9,257,661	41,351	+817.3%	Shares	Defined	2025-05-14
2023-03-31	$1,561,886	4,508	+272.6%	Shares	Defined	2023-05-15
2022-12-31	$284,773	1,210	-98.4%	Shares	Defined	2023-02-14
2022-06-30	$23,315,145	77,108	-70.0%	Shares	Defined	2022-08-15
2022-03-31	$105,426,382	256,693	-49.4%	Shares	Defined	2022-05-13
2021-12-31	$237,728,974	506,874	-1.6%	Shares	Defined	2022-02-14
2021-09-30	$218,700,931	515,148	+42.3%	Shares	Defined	2021-11-12
2021-06-30	$129,982,708	361,968	-4.3%	Shares	Defined	2021-08-13
2021-03-31	$106,615,126	378,363	+52.1%	Shares	Defined	2021-05-14
2020-12-31	$70,497,727	248,836	+33.4%	Shares	Defined	2021-02-12
2020-09-30	$51,273,248	186,516	+660.9%	Shares	Defined	2020-11-12
2020-06-30	$5,568,618	24,513	-75.7%	Shares	Defined	2020-08-12
2020-03-31	$15,335,076	100,723	—	Shares	Defined	2020-05-15
No filing history on record for this holder in this stock.