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 REITs0.42%-0.32 ppRetail REITs0.31%-0.19 ppData Center REITs0.19%-0.14 ppMulti-Family Residential REITs0.21%-0.13 ppHealth Care REITs0.19%-0.11 ppSelf-Storage REITs0.16%-0.10 ppIndustrial REITs0.12%-0.08 ppTimber REITs0.08%-0.08 ppOffice REITs0.11%-0.07 ppHotel & Resort REITs0.05%-0.04 ppReal Estate Services0.05%-0.03 ppOther Specialized REITs0.03%-0.02 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.42%
Industry change · 12M
-0.32 pp
Telecom Tower REITs · contribution
-0.317 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 2018 · 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 | $65.7bn | 0.212% | -0.159 pp | -0.149 pp | +2.1% | No |
| Crown Castle → CCI | United States | $47.3bn | 0.153% | -0.109 pp | -0.109 pp | +3.1% | No |
| SBA Communications → SBAC | United States | $17.8bn | 0.058% | -0.053 pp | -0.059 pp | -11.0% | 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.