West Pharmaceutical Services, Inc.
MX ˙ BMV ˙ US9553061055
SecurityMX:WST / West Pharmaceutical Services, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership7,579 shares
Latest Disclosed Value $ 1,899,900
Advisor Group Holdings, Inc. reports 14.76% decrease in ownership of WST / West Pharmaceutical Services, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 7,579 shares of West Pharmaceutical Services, Inc. (MX:WST) valued at $1,899,900 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 8,891 shares of West Pharmaceutical Services, Inc.. This represents a change in shares of -14.76% during the quarter.

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)
2026-05-15 2026-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 7,579 -1,312 -14.76 1,900 -22.36 0.0016
2026-02-17 2025-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 8,891 -4,436 -33.29 2,447 -28.10 0.0036
2025-11-14 2025-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 13,327 866 6.95 3,403 24.12 0.0048
2025-09-04 2025-06-30 13F/A-1 EST PHARMACEUTICAL SVSC COM 955306105 12,461 1,647 15.23 2,742 13.22 0.0049
2025-08-13 2025-06-30 13F EST PHARMACEUTICAL SVSC COM 955306105 14,313 3,499 3,925 0.0045
2025-05-12 2025-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 10,814 -1,338 -11.01 2,422 -29.72 0.0054
2025-06-06 2024-12-31 13F/A-1 WEST PHARMACEUTICAL SVSC COM 955306105 12,152 2,323 23.63 3,445 16.78 0.0077
2025-02-07 2024-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 11,894 2,065 3,171 0.0081
2024-11-13 2024-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 9,829 984 11.12 2,951 1.27 0.0067
2024-08-13 2024-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 8,845 1,719 24.12 2,913 3.30 0.0069
2024-05-10 2024-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 7,126 -18,497 -72.19 2,821 -68.75 0.0063
2024-02-12 2023-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 25,623 -16,287 -38.86 9,026 -42.61 0.0158
2023-11-13 2023-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 41,910 10,842 34.90 15,728 32.55 0.0232
2023-08-21 2023-06-30 13F/A-1 WEST PHARMACEUTICAL SVSC COM 955306105 31,068 -517 -1.64 11,866 8.29 0.0213
2023-08-10 2023-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 33,357 1,772 11,864 0.0032
2023-05-12 2023-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 31,585 -707 -2.19 10,958 44.13 0.0206
2023-02-10 2022-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 32,292 -31,199 -49.14 7,602 -51.35 0.0154
2022-11-14 2022-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 63,491 20,441 47.48 15,625 19.81 0.0357
2022-08-10 2022-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 43,050 -8,980 -17.26 13,042 -34.02 0.0288
2022-05-04 2022-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 52,030 343 0.66 19,768 -18.35 0.0384
2022-02-03 2021-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 51,687 3,400 7.04 24,211 18.15 0.0458
2021-11-05 2021-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 48,287 1,276 2.71 20,492 21.33 0.0427
2021-08-02 2021-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 47,011 6,293 15.46 16,890 47.18 0.0366
2021-05-13 2021-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 40,718 2,985 7.91 11,476 7.39 0.0276
2021-02-10 2020-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 37,733 4,611 13.92 10,686 19.81 0.0285
2020-11-12 2020-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 33,122 2,295 7.44 8,919 27.34 0.0267
2020-08-14 2020-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 30,827 4,611 17.59 7,004 74.62 0.0235
2020-05-18 2020-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 26,216 26,216 4,011 0.0164
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.