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

0.211%

12M weight contribution

+0.004 pp

3M weight contribution

+0.070 pp

12M price return

+10.7%

Share of matched S&P 500 members

Monthly observations through Oct 2023

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 2023	$61.9bn	0.211%	+0.004 pp	+10.7%	Yes
Sep 2023	$65.8bn	0.220%	-0.002 pp	+21.9%	Yes
Aug 2023	$67.6bn	0.216%	+0.005 pp	+20.3%	Yes
Jul 2023	$64.6bn	0.141%	-0.070 pp	+10.3%	No
Jun 2023	$70.5bn	0.163%	-0.060 pp	+29.0%	No
May 2023	$63.0bn	0.156%	-0.055 pp	+12.7%	No
Apr 2023	$66.4bn	0.224%	+0.003 pp	+13.8%	Yes
Mar 2023	$64.7bn	0.221%	-0.014 pp	-2.5%	Yes
Feb 2023	$62.4bn	0.219%	+0.002 pp	+4.8%	Yes
Jan 2023	$65.9bn	0.226%	+0.021 pp	+16.1%	Yes
Dec 2022	$62.1bn	0.224%	+0.012 pp	+0.6%	Yes
Nov 2022	$63.8bn	0.216%	-0.004 pp	+5.0%	Yes
Oct 2022	$58.2bn	0.207%	-0.029 pp	-11.3%	No
Sep 2022	$56.5bn	0.222%	-0.004 pp	-5.6%	Yes
Aug 2022	$58.9bn	0.211%	-0.006 pp	-2.0%	No
Jul 2022	$61.4bn	0.211%	+0.010 pp	+12.7%	No
Jun 2022	$57.3bn	0.223%	+0.033 pp	+13.8%	Yes
May 2022	$58.5bn	0.211%	+0.006 pp	+9.6%	No
Apr 2022	$61.2bn	0.221%	+0.016 pp	+15.4%	Yes
Mar 2022	$69.7bn	0.234%	+0.133 pp	+42.6%	Yes
Feb 2022	$62.5bn	0.217%	+0.114 pp	+29.3%	No
Jan 2022	$60.9bn	0.205%	+0.094 pp	+37.1%	No
Dec 2021	$66.2bn	0.212%	+0.017 pp	+43.4%	No
Nov 2021	$65.2bn	0.220%	+0.021 pp	+45.5%	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.