WEST PHARMACEUTICAL SERVICES (WST) Institutional Ownership Changes & 13F Activity

WEST PHARMACEUTICAL SERVICES (WST) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Viking Global Investors, Renaissance Technologies LLC, Sequoia Financial Advisors, Hillman Value Fund, and Parnassus Endeavor Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2019Renaissance Technologies LLCSell-111,600309,000$38,671
Q1 2019Renaissance Technologies LLCBuy281,000420,600$46,350
Q4 2018Renaissance Technologies LLCSell-20,800139,600$13,685
Q3 2018Renaissance Technologies LLCSell-266,800160,400$19,805
Q3 2018Sequoia FundSell-25622,944$2,833
Q2 2018Sequoia FundSell-1,33423,200$2,304
Q1 2018Renaissance Technologies LLCBuy60,700427,200$37,717
Q1 2018Sequoia FundBuy24,53424,534$2,122
Q4 2017Renaissance Technologies LLCSell-54,000366,500$36,163
Q3 2017Renaissance Technologies LLCBuy101,900420,500$40,477
Q2 2017Renaissance Technologies LLCBuy314,500318,600$30,114
Q1 2017Renaissance Technologies LLCSell-41,8004,100$335
Q2 2016Renaissance Technologies LLCSell-468,30045,900$3,483
Q1 2016Renaissance Technologies LLCSell-300514,200$35,644
Q4 2015Renaissance Technologies LLCSell-84,000514,500$30,983
Q3 2015Renaissance Technologies LLCSell-235,300598,500$32,391
Q2 2015Renaissance Technologies LLCSell-69,400833,800$48,427
Q1 2015Renaissance Technologies LLCSell-37,400903,200$54,382
Q4 2014Renaissance Technologies LLCSell-312,200940,600$50,078
Q3 2014Renaissance Technologies LLCSell-354,3001,252,800$56,075
Q2 2014Renaissance Technologies LLCBuy187,3001,607,100$67,787
Q1 2014Renaissance Technologies LLCBuy499,8001,419,800$62,542
Q4 2013Renaissance Technologies LLCBuy244,100920,000$45,135
Q3 2013Renaissance Technologies LLCBuy443,500675,900$27,813
Q2 2013Renaissance Technologies LLCBuy232,400232,400$16,328

Frequently asked questions about WST activity

  • Which institutional owners are buying WST?

    Institutional owners buying WST include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in WST activity?

    "Buy" means an investor increased their reported position in WST compared to the prior reporting period. This reflects growing exposure to WEST PHARMACEUTICAL SERVICES (WST) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in WST increasing?

    Institutional interest in WST can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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