Observatory · observe first
West Pharmaceutical Services
WST · United States · Health Care Supplies · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.038%
12M weight contribution
-0.013 pp
3M weight contribution
+0.004 pp
12M price return
-12.3%
Share of matched S&P 500 members
Monthly observations through Sep 2025
Company price index
A separate dimension from market allocation
Historical observations
Most recent 24 observations at or before the selected month
| Month | Market cap | Universe weight | 12M weight change | 12M return | Above 6M weight average |
|---|---|---|---|---|---|
| Sep 2025 | $18.9bn | 0.038% | -0.013 pp | -12.3% | Yes |
| Aug 2025 | $17.8bn | 0.037% | -0.018 pp | -21.0% | Yes |
| Jul 2025 | $17.2bn | 0.036% | -0.004 pp | -21.6% | Yes |
| Jun 2025 | $15.7bn | 0.034% | -0.011 pp | -33.4% | No |
| May 2025 | $15.1bn | 0.034% | -0.012 pp | -36.2% | No |
| Apr 2025 | $15.2bn | 0.036% | -0.039 pp | -40.7% | No |
| Mar 2025 | $16.2bn | 0.038% | -0.042 pp | -43.3% | No |
| Feb 2025 | $16.8bn | 0.038% | -0.038 pp | -35.0% | No |
| Jan 2025 | $24.7bn | 0.055% | -0.027 pp | -8.3% | Yes |
| Dec 2024 | $23.7bn | 0.054% | -0.024 pp | -6.8% | Yes |
| Nov 2024 | $23.6bn | 0.052% | -0.029 pp | -6.9% | Yes |
| Oct 2024 | $22.3bn | 0.052% | -0.028 pp | -3.0% | Yes |
| Sep 2024 | $21.8bn | 0.051% | -0.042 pp | -19.8% | No |
| Aug 2024 | $22.8bn | 0.055% | -0.041 pp | -22.7% | No |
| Jul 2024 | $22.2bn | 0.040% | -0.019 pp | -16.6% | No |
| Jun 2024 | $24.0bn | 0.045% | -0.021 pp | -13.7% | No |
| May 2024 | $24.1bn | 0.046% | -0.015 pp | -0.7% | No |
| Apr 2024 | $26.0bn | 0.075% | -0.015 pp | -0.8% | No |
| Mar 2024 | $29.0bn | 0.080% | -0.007 pp | +14.5% | Yes |
| Feb 2024 | $26.3bn | 0.075% | -0.007 pp | +13.3% | No |
| Jan 2024 | $27.6bn | 0.082% | +0.015 pp | +40.8% | No |
| Dec 2023 | $26.1bn | 0.078% | +0.015 pp | +50.0% | No |
| Nov 2023 | $26.0bn | 0.081% | +0.022 pp | +49.8% | Yes |
| Oct 2023 | $23.6bn | 0.080% | +0.020 pp | +38.7% | Yes |
Its weight is estimated market cap divided by the total estimated market cap of matched S&P 500 members for the month. This is not an official float-adjusted S&P index weight.