There is a long list of 775 institutional holders of WST within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of WST by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-WST table below, the initial column indicates the name of each top institutional holder of WST, with a link to that fund's top holdings. The next columns indicate the amount of WST stock held by each of the institutional holders of WST, followed by the WST position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
Vanguard Group Inc.	9,002,632	$3,170,007	12/31/2023
WST	9,002,632	$3,170,007	12/31/2023
BlackRock Inc.	7,778,305	$2,738,897	12/31/2023
WST	7,778,305	$2,738,897	12/31/2023
Bank of New York Mellon Corp	3,292,213	$1,302,762	03/31/2024
WST	3,292,213	$1,302,762	03/31/2024
State Street Corp	3,271,929	$1,152,112	12/31/2023
WST	3,271,929	$1,152,112	12/31/2023
Price T Rowe Associates Inc. MD	2,327,394	$819,523	12/31/2023
WST	2,327,394	$819,523	12/31/2023
APG Asset Management N.V.	2,300,369	$810,006	12/31/2023
WST	2,300,369	$810,006	12/31/2023
Franklin Resources Inc.	2,105,589	$741,420	12/31/2023
WST	2,105,589	$741,420	12/31/2023
Artisan Partners Limited Partnership	1,961,063	$690,530	12/31/2023
WST	1,961,063	$690,530	12/31/2023
Brown Advisory Inc.	1,637,877	$648,124	03/31/2024
WST	1,637,877	$648,124	03/31/2024
Geode Capital Management LLC	1,668,047	$585,900	12/31/2023
WST	1,668,047	$585,900	12/31/2023
T. Rowe Price Investment Management Inc.	1,244,800	$438,319	12/31/2023
WST	1,244,800	$438,319	12/31/2023
Durable Capital Partners LP	1,138,730	$400,970	12/31/2023
WST	1,138,730	$400,970	12/31/2023
Morgan Stanley	1,023,852	$360,520	12/31/2023
WST	1,023,852	$360,520	12/31/2023
Bamco Inc. NY	997,821	$351,353	12/31/2023
WST	997,821	$351,353	12/31/2023
Invesco Ltd.	942,669	$331,933	12/31/2023
WST	942,669	$331,933	12/31/2023
Citadel Advisors LLC		$319,942	12/31/2023
WST	929,017	$327,125	12/31/2023
Put	41,200	$14,507	12/31/2023
Call	20,800	$7,324	12/31/2023
JPMorgan Chase & Co.		$308,728	12/31/2023
WST	880,069	$309,890	12/31/2023
Put	4,700	$1,655	12/31/2023
Call	1,400	$493	12/31/2023
Norges Bank	852,693	$300,250	12/31/2023
WST	852,693	$300,250	12/31/2023
Northern Trust Corp	771,645	$271,712	12/31/2023
WST	771,645	$271,712	12/31/2023
Findlay Park Partners LLP	597,106	$236,281	03/31/2024
WST	597,106	$236,281	03/31/2024
Massachusetts Financial Services Co. MA	663,135	$233,503	12/31/2023
WST	663,135	$233,503	12/31/2023
TD Asset Management Inc.	659,560	$232,244	12/31/2023
WST	659,560	$232,244	12/31/2023
Alliancebernstein L.P.	647,166	$227,880	12/31/2023
WST	647,166	$227,880	12/31/2023
Legal & General Group Plc	635,280	$223,695	12/31/2023
WST	635,280	$223,695	12/31/2023
FMR LLC	575,349	$202,592	12/31/2023
WST	575,349	$202,592	12/31/2023
Macquarie Group Ltd.	572,871	$201,720	12/31/2023
WST	572,871	$201,720	12/31/2023
Riverbridge Partners LLC	501,891	$198,603	03/31/2024
WST	501,891	$198,603	03/31/2024
Neuberger Berman Group LLC	544,432	$191,706	12/31/2023
WST	544,432	$191,706	12/31/2023
Bank of America Corp DE	496,373	$174,783	12/31/2023
WST	496,373	$174,783	12/31/2023
Nuveen Asset Management LLC	454,239	$159,947	12/31/2023
WST	454,239	$159,947	12/31/2023
Kayne Anderson Rudnick Investment Management LLC	445,577	$156,897	12/31/2023
WST	445,577	$156,897	12/31/2023
ProShare Advisors LLC	439,415	$154,727	12/31/2023
WST	439,415	$154,727	12/31/2023
Goldman Sachs Group Inc.	434,189	$152,887	12/31/2023
WST	434,189	$152,887	12/31/2023
Charles Schwab Investment Management Inc.	422,818	$148,883	12/31/2023
WST	422,818	$148,883	12/31/2023
UBS Asset Management Americas Inc.	414,724	$146,033	12/31/2023
WST	414,724	$146,033	12/31/2023
Deutsche Bank AG	401,022	$141,208	12/31/2023
WST	401,022	$141,208	12/31/2023
State Farm Mutual Automobile Insurance Co.	388,239	$136,707	12/31/2023
WST	388,239	$136,707	12/31/2023
Amundi	379,015	$132,405	12/31/2023
WST	379,015	$132,405	12/31/2023
Congress Asset Management Co. MA	328,132	$129,845	03/31/2024
WST	328,132	$129,845	03/31/2024
Eagle Asset Management Inc.	350,736	$123,501	12/31/2023
WST	350,736	$123,501	12/31/2023
Royal Bank of Canada	341,697	$120,317	12/31/2023
WST	341,697	$120,317	12/31/2023
Sei Investments Co.	338,919	$119,340	12/31/2023
WST	338,919	$119,340	12/31/2023
AustralianSuper Pty Ltd	274,460	$108,670	03/31/2024
WST	274,460	$108,670	03/31/2024
Ameriprise Financial Inc.	307,301	$108,207	12/31/2023
WST	307,301	$108,207	12/31/2023
Qube Research & Technologies Ltd	298,164	$104,990	12/31/2023
WST	298,164	$104,990	12/31/2023
Prudential Financial Inc.	281,020	$98,935	12/31/2023
WST	281,020	$98,935	12/31/2023
Dimensional Fund Advisors LP	269,592	$94,934	12/31/2023
WST	269,592	$94,934	12/31/2023
Champlain Investment Partners LLC	265,755	$93,578	12/31/2023
WST	265,755	$93,578	12/31/2023
Envestnet Asset Management Inc.	260,482	$91,721	12/31/2023
WST	260,482	$91,721	12/31/2023
Swiss National Bank	231,000	$81,340	12/31/2023
WST	231,000	$81,340	12/31/2023