Observatory · observe first
Willis Towers Watson
WTW · United States · Insurance Brokers · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.059%
12M weight contribution
-0.013 pp
3M weight contribution
-0.007 pp
12M price return
+4.8%
Share of matched S&P 500 members
Monthly observations through Oct 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 |
|---|---|---|---|---|---|
| Oct 2025 | $30.0bn | 0.059% | -0.013 pp | +4.8% | No |
| Sep 2025 | $33.7bn | 0.067% | -0.002 pp | +18.6% | No |
| Aug 2025 | $31.9bn | 0.066% | -0.006 pp | +13.2% | No |
| Jul 2025 | $31.3bn | 0.066% | +0.015 pp | +13.2% | No |
| Jun 2025 | $30.4bn | 0.066% | +0.015 pp | +18.3% | No |
| May 2025 | $31.4bn | 0.071% | +0.021 pp | +25.5% | No |
| Apr 2025 | $30.5bn | 0.073% | -0.001 pp | +24.0% | No |
| Mar 2025 | $33.7bn | 0.080% | +0.002 pp | +24.4% | Yes |
| Feb 2025 | $33.9bn | 0.076% | -0.004 pp | +26.1% | Yes |
| Jan 2025 | $33.2bn | 0.074% | -0.002 pp | +35.5% | Yes |
| Dec 2024 | $31.6bn | 0.072% | -0.003 pp | +31.5% | Yes |
| Nov 2024 | $32.4bn | 0.072% | -0.008 pp | +32.5% | Yes |
| Oct 2024 | $30.4bn | 0.072% | -0.011 pp | +29.8% | Yes |
| Sep 2024 | $29.9bn | 0.070% | -0.004 pp | +42.8% | Yes |
| Aug 2024 | $29.7bn | 0.072% | +0.003 pp | +43.3% | Yes |
| Jul 2024 | $28.7bn | 0.051% | +0.003 pp | +35.5% | No |
| Jun 2024 | $26.8bn | 0.050% | -0.008 pp | +12.9% | No |
| May 2024 | $26.1bn | 0.050% | -0.008 pp | +18.3% | No |
| Apr 2024 | $25.7bn | 0.074% | -0.009 pp | +10.0% | No |
| Mar 2024 | $28.2bn | 0.078% | -0.006 pp | +20.0% | No |
| Feb 2024 | $27.9bn | 0.080% | -0.008 pp | +18.1% | Yes |
| Jan 2024 | $25.4bn | 0.076% | -0.019 pp | -1.7% | No |
| Dec 2023 | $24.9bn | 0.074% | -0.021 pp | +0.1% | Yes |
| Nov 2023 | $25.4bn | 0.079% | -0.011 pp | +1.5% | 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.