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 REITs0.37%-0.17 ppIndustrial REITs0.24%-0.09 ppHealth Care REITs0.28%+0.05 ppHotel & Resort REITs0.10%-0.03 ppOther Specialized REITs0.08%+0.02 ppTimber REITs0.05%-0.02 ppData Center REITs0.35%-0.02 ppSingle-Family Residential REITs0.05%-0.02 ppOffice REITs0.07%-0.02 ppSelf-Storage REITs0.21%-0.01 ppRetail REITs0.32%-0.01 ppReal Estate Services0.17%-0.01 ppMulti-Family Residential REITs0.21%-0.01 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.37%
Industry change · 12M
-0.17 pp
Telecom Tower REITs · contribution
-0.174 pp
Company participation
33%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2024 · 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 | $97.7bn | 0.216% | -0.037 pp | -0.088 pp | +3.4% | No |
| Crown Castle → CCI | United States | $46.2bn | 0.102% | -0.016 pp | -0.057 pp | -4.1% | No |
| SBA Communications → SBAC | United States | $24.3bn | 0.054% | -0.005 pp | -0.029 pp | -6.7% | 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.