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
0.044%
12M weight contribution
+0.010 pp
3M weight contribution
+0.018 pp
12M price return
+64.6%
Share of matched S&P 500 members
Monthly observations through Jun 2026
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 |
|---|---|---|---|---|---|
| Jun 2026 | $25.4bn | 0.044% | +0.010 pp | +64.6% | Yes |
| May 2026 | $22.8bn | 0.040% | +0.005 pp | +53.6% | Yes |
| Apr 2026 | $21.0bn | 0.029% | -0.008 pp | +41.3% | No |
| Mar 2026 | $18.1bn | 0.026% | -0.012 pp | +12.3% | No |
| Feb 2026 | $18.3bn | 0.025% | -0.012 pp | +9.9% | No |
| Jan 2026 | $16.6bn | 0.032% | -0.023 pp | -32.0% | No |
| Dec 2025 | $19.8bn | 0.039% | -0.015 pp | -15.7% | Yes |
| Nov 2025 | $19.9bn | 0.039% | -0.013 pp | -14.6% | Yes |
| Oct 2025 | $20.3bn | 0.040% | -0.013 pp | -8.1% | Yes |
| 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 |
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.