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
0.236%
12M weight contribution
+0.108 pp
3M weight contribution
-0.002 pp
12M price return
+24.9%
Share of matched S&P 500 members
Monthly observations through Oct 2019
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 2019 | $45.2bn | 0.236% | +0.108 pp | +24.9% | No |
| Sep 2019 | $45.7bn | 0.242% | +0.124 pp | +27.1% | No |
| Aug 2019 | $46.0bn | 0.250% | +0.136 pp | +35.2% | Yes |
| Jul 2019 | $44.6bn | 0.238% | +0.034 pp | +33.5% | No |
| Jun 2019 | $46.4bn | 0.250% | +0.047 pp | +42.6% | Yes |
| May 2019 | $43.3bn | 0.252% | +0.045 pp | +30.4% | Yes |
| Apr 2019 | $43.3bn | 0.241% | +0.026 pp | +28.1% | Yes |
| Mar 2019 | $41.0bn | 0.235% | +0.023 pp | +23.3% | Yes |
| Feb 2019 | $41.2bn | 0.239% | +0.032 pp | +23.9% | Yes |
| Jan 2019 | $37.6bn | 0.124% | -0.079 pp | +11.4% | Yes |
| Dec 2018 | $35.0bn | 0.125% | -0.077 pp | +3.4% | No |
| Nov 2018 | $39.8bn | 0.132% | -0.071 pp | +17.4% | No |
| Oct 2018 | $37.6bn | 0.128% | -0.075 pp | +11.1% | No |
| Sep 2018 | $37.3bn | 0.119% | -0.084 pp | +9.1% | No |
| Aug 2018 | $35.3bn | 0.114% | -0.089 pp | +3.2% | No |
| Jul 2018 | $34.8bn | 0.203% | +0.001 pp | +1.5% | No |
| Jun 2018 | $33.5bn | 0.203% | +0.001 pp | -3.2% | No |
| May 2018 | $34.2bn | 0.208% | +0.005 pp | -1.3% | No |
| Apr 2018 | $35.1bn | 0.216% | +0.013 pp | +0.5% | Yes |
| Mar 2018 | $34.5bn | 0.212% | +0.009 pp | -1.3% | Yes |
| Feb 2018 | $34.5bn | 0.207% | +0.004 pp | -1.3% | Yes |
| Jan 2018 | $35.5bn | 0.203% | +0.000 pp | +0.0% | 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.