Iron Mountain

IRM · United States · Other Specialized REITs · matched S&P 500 member. Follow its market-weight contribution.

Historical time machine

Historical observation

20182026

Universe weight

0.059%

12M weight contribution

+0.007 pp

3M weight contribution

+0.020 pp

12M price return

+23.3%

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	$17.2bn	0.059%	+0.007 pp	+23.3%	Yes
Sep 2023	$17.4bn	0.058%	+0.008 pp	+41.3%	Yes
Aug 2023	$18.5bn	0.059%	+0.004 pp	+26.4%	Yes
Jul 2023	$17.9bn	0.039%	-0.009 pp	+32.5%	No
Jun 2023	$16.6bn	0.038%	-0.017 pp	+22.1%	No
May 2023	$15.6bn	0.038%	-0.018 pp	+3.9%	No
Apr 2023	$16.1bn	0.054%	-0.002 pp	+7.8%	Yes
Mar 2023	$15.4bn	0.053%	-0.002 pp	+0.1%	No
Feb 2023	$15.3bn	0.054%	+0.004 pp	+12.5%	Yes
Jan 2023	$15.9bn	0.054%	+0.010 pp	+24.7%	Yes
Dec 2022	$14.5bn	0.052%	+0.004 pp	-0.1%	Yes
Nov 2022	$15.8bn	0.054%	+0.009 pp	+25.6%	Yes
Oct 2022	$14.6bn	0.052%	+0.008 pp	+15.2%	No
Sep 2022	$12.8bn	0.050%	+0.006 pp	+6.3%	No
Aug 2022	$15.3bn	0.055%	+0.009 pp	+15.9%	Yes
Jul 2022	$14.1bn	0.048%	+0.005 pp	+16.6%	No
Jun 2022	$14.1bn	0.055%	+0.012 pp	+21.1%	Yes
May 2022	$15.7bn	0.056%	+0.011 pp	+30.3%	Yes
Apr 2022	$15.6bn	0.056%	+0.015 pp	+41.0%	Yes
Mar 2022	$16.1bn	0.054%	+0.033 pp	+57.6%	Yes
Feb 2022	$14.3bn	0.049%	+0.029 pp	+49.5%	Yes
Jan 2022	$13.3bn	0.045%	+0.021 pp	+44.3%	No
Dec 2021	$15.2bn	0.049%	+0.014 pp	+87.8%	Yes
Nov 2021	$13.2bn	0.044%	+0.011 pp	+76.2%	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.