Observatory · observe first
Follow the allocation change
Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.
Historical time machine
Historical observation
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Real Estate
Telecom Tower REITs1.14%+0.24 ppRetail REITs0.31%-0.24 ppData Center REITs0.50%+0.16 ppHealth Care REITs0.26%-0.11 ppIndustrial REITs0.37%+0.10 ppSelf-Storage REITs0.25%-0.04 ppMulti-Family Residential REITs0.36%-0.04 ppHotel & Resort REITs0.05%-0.03 ppTimber REITs0.09%-0.02 ppReal Estate Services0.08%-0.02 ppOther Specialized REITs0.04%-0.01 ppOffice REITs0.20%-0.01 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
1.14%
Industry change · 12M
+0.24 pp
Telecom Tower REITs · contribution
+0.245 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2020 · sorted by absolute contribution to 12-month change
| Company | Country | Market cap | Universe weight | 3M contribution | 12M contribution | 12M price return | Above 6M weight average |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $105.5bn | 0.590% | +0.084 pp | +0.110 pp | +24.0% | Yes |
| Crown Castle → CCI | United States | $66.4bn | 0.372% | +0.065 pp | +0.081 pp | +31.0% | Yes |
| SBA Communications → SBAC | United States | $32.5bn | 0.182% | +0.043 pp | +0.054 pp | +43.0% | Yes |
Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.