West Pharmaceutical Services, Inc.
MX ˙ BMV ˙ US9553061055
SecurityMX:WST / West Pharmaceutical Services, Inc.
InstitutionGrandfield & Dodd, Llc
Latest Disclosed Ownership1,667 shares
Latest Disclosed Value $ 417,817
Grandfield & Dodd, Llc ownership in WST / West Pharmaceutical Services, Inc.

On May 7, 2026 - Grandfield & Dodd, Llc filed a 13F-HR form disclosing ownership of 1,667 shares of West Pharmaceutical Services, Inc. (MX:WST) valued at $417,817 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,667 shares of West Pharmaceutical Services, Inc.. This represents a change in shares of 0.00% 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)
2026-05-07 2026-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 418 -8.95 0.0236
2026-02-10 2025-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 459 4.81 0.0260
2025-10-30 2025-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 437 20.05 0.0248
2025-08-08 2025-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 365 -2.41 0.0214
2025-05-02 2025-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 373 -31.68 0.0231
2025-02-06 2024-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 0 0.00 546 9.20 0.0337
2024-11-08 2024-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,667 -351 -17.39 500 -24.70 0.0297
2024-08-09 2024-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 665 -16.79 0.0421
2024-05-06 2024-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 799 12.39 0.0504
2024-01-31 2023-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 711 -6.21 0.0491
2023-10-26 2023-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 757 -1.82 0.0556
2023-08-08 2023-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 772 10.30 0.0540
2023-04-28 2023-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 699 47.47 0.0489
2023-01-20 2022-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 475 -5.20 0.0347
2022-11-04 2022-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 500 -18.03 0.0408
2022-08-01 2022-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 610 -26.51 0.0480
2022-04-19 2022-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 830 -12.63 0.0563
2022-02-08 2021-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 950 10.47 0.0611
2021-10-28 2021-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 860 19.44 0.0600
2021-07-28 2021-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 720 26.32 0.0498
2021-04-22 2021-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 570 0.00 0.0426
2021-01-29 2020-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 0 0.00 570 3.64 0.0447
2020-11-03 2020-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,018 -70 -3.35 550 17.02 0.0495
2020-07-24 2020-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 470 47.80 0.0455
2020-05-14 2020-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 318 1.27 0.0375
2020-02-07 2019-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 314 6.08 0.0286
2019-10-30 2019-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 296 13.41 0.0291
2019-07-29 2019-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 261 13.48 0.0258
2019-04-26 2019-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 230 12.20 0.0240
2019-02-12 2018-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 205 -20.54 0.0243
2018-11-02 2018-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 258 24.64 0.0266
2018-07-27 2018-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 2,088 207 0.0227
2018-05-04 2018-03-31 13F/A-1 WEST PHARMACEUTICAL SVSC COM 955306105 0 -2,088 -100.00 0 -100.00
2018-02-05 2017-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 0 0.00 206 2.49 0.0220
2017-11-03 2017-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 2,088 2,088 201 0.0226
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.