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 REITs0.94%+0.19 ppHealth Care REITs0.39%+0.07 ppIndustrial REITs0.27%+0.07 ppTimber REITs0.10%-0.05 ppMulti-Family Residential REITs0.40%+0.04 ppRetail REITs0.51%-0.03 ppHotel & Resort REITs0.07%-0.02 ppOther Specialized REITs0.04%-0.01 ppSelf-Storage REITs0.30%+0.01 ppOffice REITs0.20%+0.01 ppReal Estate Services0.09%-0.00 ppData Center REITs0.35%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.94%
Industry change · 12M
+0.19 pp
Telecom Tower REITs · contribution
+0.186 pp
Company participation
67%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 2019 · 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 | $93.7bn | 0.499% | +0.019 pp | +0.117 pp | +45.6% | Yes |
| SBA Communications → SBAC | United States | $27.8bn | 0.148% | +0.020 pp | +0.042 pp | +55.1% | Yes |
| Crown Castle → CCI | United States | $55.4bn | 0.295% | +0.004 pp | +0.027 pp | +24.7% | No |
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.