Observatory · observe first
Aon plc
AON · United States · Insurance Brokers · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.212%
12M weight contribution
+0.017 pp
3M weight contribution
-0.014 pp
12M price return
+43.4%
Share of matched S&P 500 members
Monthly observations through Dec 2021
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 |
|---|---|---|---|---|---|
| Dec 2021 | $66.2bn | 0.212% | +0.017 pp | +43.4% | No |
| Nov 2021 | $65.2bn | 0.220% | +0.021 pp | +45.5% | Yes |
| Oct 2021 | $70.5bn | 0.235% | +0.036 pp | +75.2% | Yes |
| Sep 2021 | $64.5bn | 0.226% | +0.226 pp | +39.7% | Yes |
| Aug 2021 | $64.8bn | 0.217% | +0.216 pp | +44.7% | Yes |
| Jul 2021 | $58.7bn | 0.201% | +0.201 pp | +27.8% | Yes |
| Jun 2021 | $53.9bn | 0.190% | +0.190 pp | +25.1% | Yes |
| May 2021 | $57.2bn | 0.205% | +0.205 pp | +29.8% | Yes |
| Apr 2021 | $56.7bn | 0.206% | -0.018 pp | +46.9% | Yes |
| Mar 2021 | $52.0bn | 0.102% | +0.101 pp | +40.7% | No |
| Feb 2021 | $51.5bn | 0.103% | +0.103 pp | +10.5% | No |
| Jan 2021 | $46.4bn | 0.111% | -0.143 pp | -6.9% | No |
| Dec 2020 | $48.3bn | 0.195% | -0.044 pp | +2.4% | Yes |
| Nov 2020 | $46.8bn | 0.199% | -0.041 pp | +1.6% | Yes |
| Oct 2020 | $42.1bn | 0.199% | -0.037 pp | -3.9% | Yes |
| Sep 2020 | $47.8bn | 0.000% | -0.242 pp | +7.5% | No |
| Aug 2020 | $46.3bn | 0.000% | -0.250 pp | +3.6% | No |
| Jul 2020 | $47.5bn | 0.000% | -0.237 pp | +9.4% | No |
| Jun 2020 | $44.5bn | 0.000% | -0.250 pp | +0.7% | No |
| May 2020 | $45.5bn | 0.000% | -0.252 pp | +10.4% | No |
| Apr 2020 | $40.0bn | 0.224% | -0.018 pp | -3.3% | Yes |
| Mar 2020 | $38.2bn | 0.000% | -0.235 pp | -2.4% | No |
| Feb 2020 | $48.2bn | 0.000% | -0.238 pp | +22.4% | No |
| Jan 2020 | $51.6bn | 0.254% | +0.130 pp | +42.3% | 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.