WEST PHARMACEUTICAL SERVICES (WST) Stock Institutional Trading Activity


WEST PHARMACEUTICAL SERVICES (WST) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Viking Global Investors, Renaissance Technologies LLC, Durable Capital Partners, Parnassus Endeavor Fund, and Hillman Value Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

Explore more:

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2023Sequoia Financial AdvisorsBuy870870$301,429
Q1 2023Durable Capital PartnersBuy128,1341,241,818$430,252,682
Q4 2022Renaissance Technologies LLCBuy95,011294,700$69,358
Q4 2022Durable Capital PartnersSell-65,7631,113,684$262,105,529
Q3 2022Renaissance Technologies LLCSell-2,311199,689$49,139
Q3 2022Durable Capital PartnersBuy185,4111,179,447$290,238
Q2 2022ARK InvestSell-19417$129
Q2 2022Renaissance Technologies LLCBuy197,100202,000$61,079
Q2 2022Durable Capital PartnersBuy245,705994,036$300,567
Q1 2022ARK InvestBuy436436$179
Q1 2022Renaissance Technologies LLCBuy3,3004,900$2,012
Q1 2022Durable Capital PartnersSell-110,879748,331$307,347
Q4 2021Renaissance Technologies LLCSell-42,6001,600$750
Q3 2021Durable Capital PartnersSell-92,053859,210$364,769
Q2 2021Durable Capital PartnersSell-17,362951,263$341,599
Q4 2020Renaissance Technologies LLCSell-16,90044,200$12,522
Q4 2020Durable Capital PartnersSell-137,493968,625$274,421
Q3 2020Durable Capital PartnersSell-135,0731,106,118$304,072
Q2 2020Renaissance Technologies LLCSell-304,10061,100$13,880
Q2 2020Durable Capital PartnersBuy298,3701,241,191$281,961
Q1 2020Renaissance Technologies LLCSell-195,200365,200$55,602
Q1 2020Durable Capital PartnersBuy942,821942,821$143,544
Q4 2019Renaissance Technologies LLCBuy187,700560,400$84,245
Q3 2019Renaissance Technologies LLCBuy63,700372,700$52,856
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 2018Sequoia FundSell-25622,944$2,833
Q3 2018Renaissance Technologies LLCSell-266,800160,400$19,805
Q2 2018Sequoia FundSell-1,33423,200$2,304

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.