West Pharmaceutical Services, Inc.
MX ˙ BMV ˙ US9553061055
SecurityMX:WST / West Pharmaceutical Services, Inc.
InstitutionWinton Capital Group Ltd
Latest Disclosed Ownership33,422 shares
Latest Disclosed Value $ 8,376,890
Winton Capital Group Ltd ownership in WST / West Pharmaceutical Services, Inc.

On May 12, 2026 - Winton Capital Group Ltd filed a 13F-HR form disclosing ownership of 33,422 shares of West Pharmaceutical Services, Inc. (MX:WST) valued at $8,376,890 USD as of March 31, 2026. The entity filed a previous 13F-HR on August 14, 2025 disclosing 0 shares of West Pharmaceutical Services, Inc..

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 33,422 33,422 8,377 0.2939
2025-08-14 2025-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 0 -5,334 -100.00 0 -100.00
2025-05-15 2025-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 5,334 1,772 49.75 1,194 2.40 0.0727
2025-02-12 2024-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 3,562 981 38.01 1,167 50.65 0.0775
2024-11-12 2024-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,581 292 12.76 775 2.79 0.0543
2024-08-09 2024-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,289 797 53.42 754 27.63 0.0509
2024-05-14 2024-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,492 1,492 590 0.0417
2024-02-12 2023-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 0 -924 -100.00 0 -100.00
2023-11-13 2023-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 924 -530 -36.45 347 -37.77 0.0286
2023-08-14 2023-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,454 -2,385 -62.13 556 -58.20 0.0465
2023-05-12 2023-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 3,839 2,153 127.70 1,330 235.86 0.0811
2023-02-14 2022-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,686 -933 -35.62 397 -38.51 0.0261
2022-11-10 2022-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,619 130 5.22 644 -14.48 0.0420
2022-08-10 2022-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,489 -325 -11.55 753 -34.86 0.0399
2022-05-11 2022-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,814 -842 -23.03 1,156 -32.59 0.0606
2022-02-10 2021-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 3,656 -2,043 -35.85 1,715 -29.10 0.1039
2021-10-28 2021-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 5,699 -231 -3.90 2,419 13.62 0.1355
2021-08-10 2021-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 5,930 2,211 59.45 2,129 103.15 0.1143
2021-07-21 2021-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 3,719 1,054 39.55 1,048 38.81 0.0598
2021-02-12 2020-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,665 -14,218 -84.21 755 -83.73 0.0545
2020-10-30 2020-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 16,883 -28,504 -62.80 4,641 -54.99 0.1509
2020-08-05 2020-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 45,387 -86,437 -65.57 10,311 -48.62 0.2661
2020-05-11 2020-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 131,824 53,937 69.25 20,070 71.41 0.5295
2020-02-13 2019-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 77,887 15,989 25.83 11,709 33.39 0.1643
2019-11-08 2019-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 61,898 59,625 2,623.19 8,778 2,990.85 0.1038
2019-07-08 2019-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,273 -2,137 -48.46 284 -41.56 0.0055
2019-05-13 2019-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 4,410 -508 -10.33 486 0.83 0.0098
2019-02-05 2018-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 4,918 -241 -4.67 482 -24.33 0.0104
2018-11-02 2018-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 5,159 -404 -7.26 637 15.40 0.0133
2018-08-20 2018-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 5,563 -10,176 -64.65 552 -60.29 0.0141
2018-05-21 2018-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 15,739 -41,381 -72.45 1,390 -75.34 0.0392
2018-02-13 2017-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 57,120 57,120 5,636 0.1632
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.