Observatory · observe first
Willis Towers Watson
WTW · United States · Insurance Brokers · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Latest available · not live
20182026
Universe weight
0.045%
12M weight contribution
-0.022 pp
3M weight contribution
+0.002 pp
12M price return
-15.5%
Share of matched S&P 500 members
Monthly observations through Sep 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 |
|---|---|---|---|---|---|
| Sep 2026 | $26.8bn | 0.045% | -0.022 pp | -15.5% | Yes |
| Aug 2026 | $31.4bn | 0.052% | -0.014 pp | +4.9% | Yes |
| Jul 2026 | $31.2bn | 0.054% | -0.012 pp | +7.7% | Yes |
| Jun 2026 | $24.7bn | 0.043% | -0.023 pp | -13.7% | Yes |
| May 2026 | $23.6bn | 0.041% | -0.030 pp | -20.2% | No |
| Apr 2026 | $24.2bn | 0.033% | -0.040 pp | -15.8% | No |
| Mar 2026 | $27.5bn | 0.040% | -0.040 pp | -13.0% | No |
| Feb 2026 | $28.9bn | 0.040% | -0.036 pp | -9.1% | No |
| Jan 2026 | $30.4bn | 0.058% | -0.016 pp | -2.6% | No |
| Dec 2025 | $31.5bn | 0.062% | -0.010 pp | +6.1% | No |
| Nov 2025 | $30.7bn | 0.060% | -0.011 pp | +0.8% | No |
| 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 |
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.