West Pharmaceutical Services, Inc.
US ˙ NYSE ˙ US9553061055

SecurityWST / West Pharmaceutical Services, Inc.
InstitutionInvesco Ltd.
Latest Disclosed Ownership1,056,007 shares
Latest Disclosed Value $ 264,677,597
Invesco Ltd. reports 16.22% increase in ownership of WST / West Pharmaceutical Services, Inc.

On May 12, 2026 - Invesco Ltd. filed a 13F-HR form disclosing ownership of 1,056,007 shares of West Pharmaceutical Services, Inc. (US:WST) valued at $264,677,594 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 19, 2026 disclosing 908,625 shares of West Pharmaceutical Services, Inc.. This represents a change in shares of 16.22% during the quarter. The current value of the position is $334,025,574 USD.

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 1,056,007 147,382 16.22 264,678 5.87 0.0050
2026-02-19 2025-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 908,625 27,340 3.10 249,999 8.14 0.0383
2025-11-13 2025-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 881,285 -78,240 -8.15 231,187 10.12 0.0364
2025-08-13 2025-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 959,525 10,070 1.06 209,944 -1.23 0.0357
2025-05-12 2025-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 949,455 194,216 25.72 212,564 -14.08 0.0403
2025-02-13 2024-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 755,239 7,876 1.05 247,386 10.28 0.0457
2024-11-12 2024-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 747,363 130,180 21.09 224,328 10.35 0.0433
2024-08-13 2024-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 617,183 -147,496 -19.29 203,294 -32.82 0.0430
2024-05-14 2024-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 764,679 -177,990 -18.88 302,591 -8.84 0.0650
2024-02-13 2023-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 942,669 161,904 20.74 331,933 13.31 0.0790
2023-11-13 2023-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 780,765 -206,810 -20.94 292,951 -22.44 0.0789
2023-08-11 2023-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 987,575 -160,094 -13.95 377,718 -5.01 0.0990
2023-05-12 2023-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,147,669 543,382 89.92 397,633 179.59 0.1109
2023-02-13 2022-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 604,287 -67,882 -10.10 142,219 -14.02 0.0417
2022-11-14 2022-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 672,169 -184,204 -21.51 165,406 -36.12 0.0532
2022-08-15 2022-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 856,373 -148,975 -14.82 258,941 -37.29 0.0785
2022-05-16 2022-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,005,348 -79,759 -7.35 412,907 -18.87 0.1053
2022-02-14 2021-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,085,107 -174,992 -13.89 508,926 -4.87 0.1227
2021-11-15 2021-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,260,099 154,534 13.98 534,963 34.75 0.1356
2021-08-17 2021-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,105,565 -407,307 -26.92 397,009 -6.87 0.0976
2021-05-17 2021-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,512,872 -213,034 -12.34 426,297 -12.82 0.1138
2021-02-16 2020-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,725,906 190,274 12.39 488,965 15.83 0.1423
2020-11-16 2020-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,535,632 462,972 43.16 422,145 73.24 0.1427
2020-08-14 2020-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 1,072,660 199,301 22.82 243,678 83.26 0.0871
2020-05-15 2020-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 873,359 37,651 4.51 132,968 5.84 0.0560
2020-02-14 2019-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 835,708 128,010 18.09 125,632 25.17 0.0390
2019-11-14 2019-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 707,698 109,911 18.39 100,366 34.16 0.0262
2019-08-14 2019-06-30 13F/A-1 WEST PHARMACEUTICAL SVSC COM 955306105 597,787 239,545 66.87 74,812 89.50 0.0193
2019-08-14 2019-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 597,787 -70,482 74,812
2019-05-15 2019-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 358,242 30,327 9.25 39,478 22.81 0.0133
2019-02-14 2018-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 327,915 278,455 562.99 32,146 426.38 0.0123
2018-11-14 2018-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 49,460 67 0.14 6,107 24.53 0.0019
2018-08-14 2018-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 49,393 -306,002 -86.10 4,904 -84.37 0.0016
2018-05-15 2018-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 355,395 5,948 1.70 31,378 -9.00 0.0117
2018-02-14 2017-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 349,447 757 0.22 34,480 2.73 0.0124
2017-11-14 2017-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 348,690 3,306 0.96 33,565 2.82 0.0124
2017-08-14 2017-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 345,384 -15,222 -4.22 32,646 10.93 0.0102
2017-05-15 2017-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 360,606 -39,928 -9.97 29,429 -13.39 0.0097
2017-02-14 2016-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 400,534 -111,343 -21.75 33,977 -10.90 0.0114
2016-11-14 2016-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 511,877 119,341 30.40 38,135 28.03 0.0131
2016-08-15 2016-06-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 392,536 -11,960 -2.96 29,786 6.23 0.0109
2016-05-16 2016-03-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 404,496 -153,905 -27.56 28,040 -16.61 0.0114
2016-02-16 2015-12-31 13F WEST PHARMACEUTICAL SVSC COM 955306105 558,401 49,104 9.64 33,627 22.00 0.0134
2015-11-16 2015-09-30 13F WEST PHARMACEUTICAL SVSC COM 955306105 509,297 153,790 43.26 27,563 33.49 0.0117
2015-08-14 2015-06-30 13F West Pharmaceutical Services I COMMON 955306105 355,507 111,002 45.40 20,648 40.25 0.0081
2015-05-15 2015-03-31 13F West Pharmaceutical Services I COMMON 955306105 244,505 33,601 15.93 14,722 31.11 0.0057
2015-02-13 2014-12-31 13F West Pharmaceutical Services I COMMON 955306105 210,904 22,214 11.77 11,229 32.95 0.0043
2014-11-14 2014-09-30 13F West Pharmaceutical Services I COMMON 955306105 188,690 -12,215 -6.08 8,446 -0.33 0.0034
2014-08-14 2014-06-30 13F West Pharmaceutical Services I COMMON 955306105 200,905 -818,408 -80.29 8,474 -81.13 0.0033
2014-05-15 2014-03-31 13F West Pharmaceutical Services I COMMON 955306105 1,019,313 10,125 1.00 44,902 -9.31 0.0182
2014-02-13 2013-12-31 13F West Pharmaceutical Services I COMMON 955306105 1,009,188 27,083 2.76 49,511 22.51 0.0197
2013-11-13 2013-09-30 13F West Pharmaceutical Services I COMMON 955306105 982,105 546,128 125.27 40,413 31.93 0.0176
2013-08-14 2013-06-30 13F West Pharmaceutical Services I COMMON 955306105 435,977 435,977 30,631 0.0143
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.