WEST PHARMACEUTICAL SERVICES (WST) Institutional Buying Activity
Institutional investors tracked by InsiderSet increased exposure to WEST PHARMACEUTICAL SERVICES (WST) during the quarter ended June 30, 2026 through a combination of new purchases and expanded existing positions disclosed in SEC Form 13F filings.
The largest institutional buyer of WST during the latest reporting period was Durable Capital Partners, which increased its reported WST position by approximately $209.49M based on quarter-end filing values. Several additional hedge funds and long-term asset managers also reported meaningful increases in WST exposure during the quarter.
Institutional buying activity can provide insight into investor conviction, sector allocation trends, and smart money positioning toward WEST PHARMACEUTICAL SERVICES (WST). InsiderSet tracks quarterly accumulation trends, new institutional positions, ownership increases, and estimated performance of newly disclosed holdings using SEC filing data and recent market prices.
The investors highlighted on this page collectively added approximately $605.28M in reported WST exposure during the latest filing period, reflecting continued institutional interest in WEST PHARMACEUTICAL SERVICES's growth initiatives and strategic positioning.
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q1 2026 | Viking Global Investors | Buy | 121,920 | 416,948 | $104,503,847 |
| Q1 2026 | Renaissance Technologies LLC | Buy | 104,924 | 209,660 | $52,549,182 |
| Q4 2025 | Viking Global Investors | Buy | 295,028 | 295,028 | $81,174,004 |
| Q4 2025 | Renaissance Technologies LLC | Buy | 80,436 | 104,736 | $28,817,063 |
| Q4 2025 | Sequoia Financial Advisors | Buy | 830 | 3,704 | $1,019,122 |
| Q4 2025 | Parnassus Endeavor Fund | Buy | 819 | 34,387 | $9,461,239 |
| Q3 2025 | Durable Capital Partners | Buy | 131,935 | 1,172,583 | $307,603,698 |
| Q3 2025 | Hillman Value Fund | Buy | 10,273 | 10,273 | $2,694,916 |
| Q3 2025 | Sequoia Financial Advisors | Buy | 518 | 2,874 | $753,939 |
| Q2 2025 | Parnassus Endeavor Fund | Buy | 6,769 | 69,248 | $15,151,462 |
| Q2 2025 | Sequoia Financial Advisors | Buy | 1,192 | 2,356 | $515,501 |
| Q1 2025 | Durable Capital Partners | Buy | 935,721 | 1,573,119 | $352,189,882 |
| Q1 2025 | Bill & Melinda Gates Foundation Trust | Buy | 444,500 | 444,500 | $99,514,660 |
| Q4 2024 | Parnassus Endeavor Fund | Buy | 4,090 | 62,479 | $20,465,621 |
| Q4 2024 | Sequoia Financial Advisors | Buy | 260 | 1,334 | $437,032 |
| Q3 2024 | Durable Capital Partners | Buy | 45,395 | 1,085,919 | $325,949,447 |
| Q3 2024 | Parnassus Endeavor Fund | Buy | 20,376 | 58,389 | $17,526,042 |
| Q2 2024 | Parnassus Endeavor Fund | Buy | 38,013 | 38,013 | $12,521,102 |
| Q2 2024 | Durable Capital Partners | Buy | 9,471 | 1,040,524 | $342,738,200 |
| Q2 2024 | Sequoia Financial Advisors | Buy | 83 | 1,195 | $393,677 |
| Q4 2023 | Sequoia Financial Advisors | Buy | 776 | 1,661 | $584,931 |
| Q3 2023 | Sequoia Financial Advisors | Buy | 7 | 885 | $332,124 |
| Q2 2023 | Durable Capital Partners | Buy | 36,757 | 1,278,575 | $489,016,580 |
| Q2 2023 | Sequoia Financial Advisors | Buy | 8 | 878 | $335,809 |
| Q1 2023 | Durable Capital Partners | Buy | 128,134 | 1,241,818 | $430,252,682 |
| Q1 2023 | Sequoia Financial Advisors | Buy | 870 | 870 | $301,429 |
| Q4 2022 | Renaissance Technologies LLC | Buy | 95,011 | 294,700 | $69,358 |
| Q3 2022 | Durable Capital Partners | Buy | 185,411 | 1,179,447 | $290,238 |
| Q2 2022 | Durable Capital Partners | Buy | 245,705 | 994,036 | $300,567 |
| Q2 2022 | Renaissance Technologies LLC | Buy | 197,100 | 202,000 | $61,079 |
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.