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 REITs0.62%-0.16 ppHotel & Resort REITs0.15%+0.11 ppOffice REITs0.10%-0.07 ppReal Estate Services0.17%+0.07 ppHealth Care REITs0.22%-0.07 ppSelf-Storage REITs0.26%-0.07 ppSingle-Family Residential REITs0.07%+0.07 ppMulti-Family Residential REITs0.27%-0.06 ppData Center REITs0.33%-0.04 ppRetail REITs0.36%-0.03 ppTimber REITs0.08%-0.02 ppIndustrial REITs0.39%-0.01 ppOther Specialized REITs0.05%-0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.62%
Industry change · 12M
-0.16 pp
Telecom Tower REITs · contribution
-0.160 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 2023 · 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 |
|---|---|---|---|---|---|---|---|
| Crown Castle → CCI | United States | $58.0bn | 0.198% | -0.014 pp | -0.071 pp | -24.5% | No |
| American Tower → AMT | United States | $95.2bn | 0.325% | -0.031 pp | -0.061 pp | -16.5% | No |
| SBA Communications → SBAC | United States | $28.2bn | 0.096% | -0.013 pp | -0.029 pp | -23.4% | 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.