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.
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- WEST PHARMACEUTICAL SERVICES (WST) stock institutional ownership
- WEST PHARMACEUTICAL SERVICES (WST) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q1 2018 | Sequoia Fund | Buy | 24,534 | 24,534 | $2,122 |
| Q1 2018 | Renaissance Technologies LLC | Buy | 60,700 | 427,200 | $37,717 |
| Q4 2017 | Renaissance Technologies LLC | Sell | -54,000 | 366,500 | $36,163 |
| Q3 2017 | Renaissance Technologies LLC | Buy | 101,900 | 420,500 | $40,477 |
| Q2 2017 | Renaissance Technologies LLC | Buy | 314,500 | 318,600 | $30,114 |
| Q1 2017 | Renaissance Technologies LLC | Sell | -41,800 | 4,100 | $335 |
| Q2 2016 | Renaissance Technologies LLC | Sell | -468,300 | 45,900 | $3,483 |
| Q1 2016 | Renaissance Technologies LLC | Sell | -300 | 514,200 | $35,644 |
| Q4 2015 | Renaissance Technologies LLC | Sell | -84,000 | 514,500 | $30,983 |
| Q3 2015 | Renaissance Technologies LLC | Sell | -235,300 | 598,500 | $32,391 |
| Q2 2015 | Renaissance Technologies LLC | Sell | -69,400 | 833,800 | $48,427 |
| Q1 2015 | Renaissance Technologies LLC | Sell | -37,400 | 903,200 | $54,382 |
| Q4 2014 | Renaissance Technologies LLC | Sell | -312,200 | 940,600 | $50,078 |
| Q3 2014 | Renaissance Technologies LLC | Sell | -354,300 | 1,252,800 | $56,075 |
| Q2 2014 | Renaissance Technologies LLC | Buy | 187,300 | 1,607,100 | $67,787 |
| Q1 2014 | Renaissance Technologies LLC | Buy | 499,800 | 1,419,800 | $62,542 |
| Q4 2013 | Renaissance Technologies LLC | Buy | 244,100 | 920,000 | $45,135 |
| Q3 2013 | Renaissance Technologies LLC | Buy | 443,500 | 675,900 | $27,813 |
| Q2 2013 | Renaissance Technologies LLC | Buy | 232,400 | 232,400 | $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.