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 REITs0.21%-0.15 ppMulti-Family Residential REITs0.11%-0.11 ppData Center REITs0.21%-0.10 ppRetail REITs0.22%-0.10 ppReal Estate Services0.09%-0.08 ppIndustrial REITs0.18%-0.07 ppSelf-Storage REITs0.12%-0.07 ppHealth Care REITs0.27%-0.05 ppOffice REITs0.03%-0.04 ppHotel & Resort REITs0.06%-0.04 ppTimber REITs0.02%-0.02 ppSingle-Family Residential REITs0.02%-0.02 ppOther Specialized REITs0.04%-0.02 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.21%
Industry change · 12M
-0.15 pp
Telecom Tower REITs · contribution
-0.153 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 2026 · 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 | $89.4bn | 0.123% | -0.044 pp | -0.092 pp | -3.4% | No |
| Crown Castle → CCI | United States | $39.0bn | 0.054% | -0.024 pp | -0.038 pp | +0.1% | No |
| SBA Communications → SBAC | United States | $21.3bn | 0.029% | -0.011 pp | -0.023 pp | -5.8% | 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.