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

0.216%

12M weight contribution

+0.013 pp

3M weight contribution

+0.013 pp

12M price return

+0.5%

Share of matched S&P 500 members

Monthly observations through Apr 2018

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
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.