Arthur J. Gallagher & Co.

AJG · United States · Insurance Brokers · matched S&P 500 member. Follow its market-weight contribution.

Historical time machine

Historical observation

20182026

Universe weight

0.089%

12M weight contribution

+0.045 pp

3M weight contribution

+0.001 pp

12M price return

+22.8%

Share of matched S&P 500 members

Monthly observations through Sep 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
Sep 2019	$16.7bn	0.089%	+0.045 pp	+22.8%	No
Aug 2019	$16.9bn	0.092%	+0.049 pp	+28.4%	Yes
Jul 2019	$16.8bn	0.090%	+0.014 pp	+29.5%	Yes
Jun 2019	$16.2bn	0.087%	+0.015 pp	+37.1%	Yes
May 2019	$15.6bn	0.091%	+0.018 pp	+29.1%	Yes
Apr 2019	$15.5bn	0.086%	+0.008 pp	+22.2%	Yes
Mar 2019	$14.4bn	0.083%	+0.006 pp	+16.2%	Yes
Feb 2019	$14.8bn	0.086%	+0.011 pp	+19.5%	Yes
Jan 2019	$13.7bn	0.045%	-0.025 pp	+11.9%	No
Dec 2018	$13.5bn	0.048%	-0.022 pp	+10.4%	No
Nov 2018	$14.2bn	0.047%	-0.023 pp	+14.8%	No
Oct 2018	$13.6bn	0.046%	-0.024 pp	+10.3%	No
Sep 2018	$13.6bn	0.043%	-0.027 pp	+10.9%	No
Aug 2018	$13.2bn	0.043%	-0.028 pp	+6.9%	No
Jul 2018	$13.0bn	0.076%	+0.006 pp	+5.7%	Yes
Jun 2018	$11.9bn	0.072%	+0.002 pp	-3.3%	No
May 2018	$12.1bn	0.073%	+0.003 pp	-1.8%	No
Apr 2018	$12.7bn	0.078%	+0.008 pp	+3.1%	Yes
Mar 2018	$12.5bn	0.077%	+0.006 pp	+1.2%	Yes
Feb 2018	$12.5bn	0.075%	+0.005 pp	+1.2%	Yes
Jan 2018	$12.4bn	0.070%	+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.