Observatory · observe first
American Tower
AMT · United States · Telecom Tower REITs · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.385%
12M weight contribution
+0.178 pp
3M weight contribution
-0.041 pp
12M price return
+7.2%
Share of matched S&P 500 members
Monthly observations through Mar 2022
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 |
|---|---|---|---|---|---|
| Mar 2022 | $114.5bn | 0.385% | +0.178 pp | +7.2% | No |
| Feb 2022 | $103.4bn | 0.359% | +0.167 pp | +7.0% | No |
| Jan 2022 | $114.5bn | 0.385% | +0.143 pp | +12.8% | No |
| Dec 2021 | $133.2bn | 0.427% | +0.023 pp | +32.9% | No |
| Nov 2021 | $119.5bn | 0.404% | -0.032 pp | +15.8% | No |
| Oct 2021 | $128.4bn | 0.429% | -0.054 pp | +25.3% | Yes |
| Sep 2021 | $120.8bn | 0.424% | +0.424 pp | +12.0% | No |
| Aug 2021 | $133.0bn | 0.445% | +0.444 pp | +19.7% | Yes |
| Jul 2021 | $128.7bn | 0.441% | +0.441 pp | +10.4% | Yes |
| Jun 2021 | $120.2bn | 0.424% | +0.424 pp | +6.6% | Yes |
| May 2021 | $113.6bn | 0.407% | +0.406 pp | +0.9% | Yes |
| Apr 2021 | $113.3bn | 0.411% | -0.180 pp | +9.2% | Yes |
| Mar 2021 | $106.2bn | 0.208% | +0.207 pp | +11.9% | No |
| Feb 2021 | $96.0bn | 0.192% | +0.192 pp | -2.9% | No |
| Jan 2021 | $101.0bn | 0.242% | -0.264 pp | -0.0% | No |
| Dec 2020 | $99.7bn | 0.404% | -0.096 pp | -0.5% | Yes |
| Nov 2020 | $102.7bn | 0.436% | -0.041 pp | +9.9% | Yes |
| Oct 2020 | $102.0bn | 0.483% | -0.020 pp | +7.2% | Yes |
| Sep 2020 | $107.2bn | 0.001% | -0.519 pp | +11.3% | No |
| Aug 2020 | $110.5bn | 0.001% | -0.554 pp | +10.1% | No |
| Jul 2020 | $115.9bn | 0.001% | -0.498 pp | +25.6% | No |
| Jun 2020 | $114.6bn | 0.001% | -0.487 pp | +28.6% | No |
| May 2020 | $114.4bn | 0.001% | -0.537 pp | +25.8% | No |
| Apr 2020 | $105.5bn | 0.590% | +0.110 pp | +24.0% | 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.