West Pharmaceutical Services, Inc.
DE ˙ DB ˙ GB00BLGXWY71
269,50 € ↑3,00 (1,13%)
2026-06-04
DEL PRIS
SecurityDE:WPS / West Pharmaceutical Services, Inc.
InstitutionAmi Asset Management Corp
Latest Disclosed Ownership154,401 shares
Latest Disclosed Value $ 38,699,122
Ami Asset Management Corp reports 2.92% decrease in ownership of WPS / West Pharmaceutical Services, Inc.

On April 23, 2026 - Ami Asset Management Corp filed a 13F-HR form disclosing ownership of 154,401 shares of West Pharmaceutical Services, Inc. (DE:WPS) valued at $32,964,614 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 159,039 shares of West Pharmaceutical Services, Inc.. This represents a change in shares of -2.92% during the quarter. The current value of the position is $41,611,070 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)
2026-04-23 2026-03-31 13F WEST PHARMACEUTICAL SVCS COM 955306105 154,401 -4,638 -2.92 38,699 -11.56 2.4711
2026-01-23 2025-12-31 13F WEST PHARMACEUTICAL SVCS COM 955306105 159,039 -3,961 -2.43 43,758 2.33 2.4810
2025-10-16 2025-09-30 13F WEST PHARMACEUTICAL SVCS COM 955306105 163,000 -2,305 -1.39 42,760 18.22 2.3880
2025-07-18 2025-06-30 13F WEST PHARMACEUTICAL SVCS COM 955306105 165,305 -8,498 -4.89 36,169 -7.05 2.0672
2025-04-23 2025-03-31 13F WEST PHARMACEUTICAL SVCS COM 955306105 173,803 -8,857 -4.85 38,911 -34.97 2.2769
2025-01-17 2024-12-31 13F WEST PHARMACEUTICAL SVCS COM 955306105 182,660 -1,486 -0.81 59,832 8.25 3.1872
2024-10-25 2024-09-30 13F WEST PHARMACEUTICAL SVCS COM 955306105 184,146 24,218 15.14 55,273 4.93 2.9941
2024-07-25 2024-06-30 13F WEST PHARM SRVC COM 955306105 159,928 -4,810 -2.92 52,679 -19.19 2.8408
2024-04-19 2024-03-31 13F WEST PHARM SRVC COM 955306105 164,738 5,217 3.27 65,188 16.05 3.3320
2024-01-19 2023-12-31 13F WEST PHARM SRVC COM 955306105 159,521 -1,039 -0.65 56,171 -6.76 3.0710
2023-10-20 2023-09-30 13F WEST PHARM SRVC COM 955306105 160,560 1,799 1.13 60,244 -0.79 3.7320
2023-07-25 2023-06-30 13F WEST PHARM SRVC COM 955306105 158,761 -21,152 -11.76 60,722 -2.59 3.6147
2023-04-21 2023-03-31 13F/A-1 WEST PHARM SRVC COM 955306105 179,913 -2,167 -1.19 62,335 148,314.29 3.9787
2023-04-21 2023-03-31 13F WEST PHARM SRVC COM 955306105 179,913 -2,167 62 3.9787
2023-01-17 2022-12-31 13F WEST PHARM SRVC COM 955306105 182,080 90,810 99.50 43 -99.81 2.9993
2022-10-24 2022-09-30 13F WEST PHARM SRVC COM 955306105 91,270 -3,988 -4.19 22,460 -22.02 1.6423
2022-07-21 2022-06-30 13F WEST PHARM SRVC COM 955306105 95,258 -1,196 -1.24 28,803 -27.29 1.8271
2022-04-27 2022-03-31 13F WEST PHARM SRVC COM 955306105 96,454 249 0.26 39,615 -12.20 2.0693
2022-01-20 2021-12-31 13F WEST PHARM SRVC COM 955306105 96,205 -2,958 -2.98 45,121 7.18 2.1812
2021-10-22 2021-09-30 13F WEST PHARM SRVC COM 955306105 99,163 -2,970 -2.91 42,099 14.79 2.1066
2021-07-20 2021-06-30 13F WEST PHARM SRVC COM 955306105 102,133 -6,043 -5.59 36,676 20.32 1.8384
2021-04-16 2021-03-31 13F WEST PHARM SRVC COM 955306105 108,176 -10,028 -8.48 30,482 -8.98 1.5929
2021-01-20 2020-12-31 13F WEST PHARM SRVC COM 955306105 118,204 -1,874 -1.56 33,489 1.45 1.6612
2020-10-23 2020-09-30 13F WEST PHARM SRVC COM 955306105 120,078 -9,090 -7.04 33,010 12.50 1.6781
2020-07-15 2020-06-30 13F WEST PHARM SRVC COM 955306105 129,168 -90,499 -41.20 29,343 -12.26 1.5649
2020-04-27 2020-03-31 13F WEST PHARM SRVC COM 955306105 219,667 -2,962 -1.33 33,444 -0.07 2.1119
2020-01-23 2019-12-31 13F WEST PHARM SRVC COM 955306105 222,629 -7,068 -3.08 33,468 2.74 1.6526
2019-10-23 2019-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 229,697 -143,651 -38.48 32,576 -30.28 1.6933
2019-08-05 2019-06-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 373,348 163,329 77.77 46,725 101.89 2.3169
2019-04-25 2019-03-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 210,019 -4,418 -2.06 23,144 10.10 1.7062
2019-01-25 2018-12-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 214,437 -6,208 -2.81 21,021 -22.84 1.7366
2018-10-22 2018-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 220,645 -71,371 -24.44 27,243 -6.04 1.8538
2018-07-23 2018-06-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 292,016 -8,564 -2.85 28,994 9.25 2.0749
2018-04-20 2018-03-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 300,580 -22,565 -6.98 26,538 -16.77 1.8949
2018-01-16 2017-12-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 323,145 -12,957 -3.86 31,885 -1.45 2.2003
2017-10-10 2017-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 336,102 87,568 35.23 32,353 37.73 2.2901
2017-07-14 2017-06-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 248,534 225,154 963.02 23,491 1,131.18 1.6753
2017-04-13 2017-03-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 23,380 -2,949 -11.20 1,908 -14.55 0.1437
2017-01-24 2016-12-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 26,329 670 2.61 2,233 16.79 0.1650
2016-10-18 2016-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 25,659 178 0.70 1,912 -1.09 0.1318
2016-07-20 2016-06-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 25,481 -192,801 -88.33 1,933 -87.22 0.1346
2016-04-19 2016-03-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 218,282 -19,019 -8.01 15,131 5.89 1.0385
2016-01-26 2015-12-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 237,301 13,051 5.82 14,290 17.75 0.9924
2015-10-16 2015-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 224,250 2,054 0.92 12,136 -5.96 0.9274
2015-07-16 2015-06-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 222,196 407 0.18 12,905 -3.36 0.9611
2015-04-14 2015-03-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 221,789 25,616 13.06 13,354 27.86 1.0385
2015-01-20 2014-12-31 13F WEST PHARMACEUTCL SVCS COM COM 955306105 196,173 38,279 24.24 10,444 47.79 0.9128
2014-10-16 2014-09-30 13F WEST PHARMACEUTCL SVCS COM COM 955306105 157,894 157,894 7,067 0.6930
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.