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WST · West Pharmaceutical Services Inc

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Market Cap
$24.12B
Shares
70.38M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 832
Total Value: $25,392,936,282
Total Shares: 70,760,005
Showing 1–100 of 849 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 832 13F filers · Δ vs Mar 31, 2026
Top Holder
9.4%
Sep 2023 → Jun 2026 · range 9.4% – 14.1%
−0.1 pts
Top 5
31.4%
Sep 2023 → Jun 2026 · range 30.0% – 37.6%
+1.4 pts
Top 10
45.8%
Sep 2023 → Jun 2026 · range 44.5% – 53.4%
+1.3 pts
HHI
291
Sep 2023 → Jun 2026 · range 284 – 430
Broadly held+6

Quarterly Activity

vs Mar 31, 2026
New
149
Increased
302
Decreased
261
Sold Out
75
Unchanged
120
Holder count: +74
Institutional value: +41.1%
Shares held: -1.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 849
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 105770 CUSIP 955306105 13F (30d) 493 filings 476 filers Visit website