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 REITs0.35%-0.48 ppMulti-Family Residential REITs0.18%-0.16 ppRetail REITs0.24%-0.14 ppSelf-Storage REITs0.15%-0.14 ppData Center REITs0.24%-0.11 ppHealth Care REITs0.16%-0.10 ppIndustrial REITs0.25%-0.09 ppOffice REITs0.07%-0.07 ppHotel & Resort REITs0.10%-0.06 ppSingle-Family Residential REITs0.05%+0.05 ppTimber REITs0.05%-0.04 ppReal Estate Services0.13%+0.03 ppOther Specialized REITs0.04%-0.01 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.35%
Industry change · 12M
-0.48 pp
Telecom Tower REITs · contribution
-0.479 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 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 |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $88.7bn | 0.193% | -0.128 pp | -0.240 pp | -27.6% | No |
| Crown Castle → CCI | United States | $47.0bn | 0.102% | -0.078 pp | -0.166 pp | -37.3% | No |
| SBA Communications → SBAC | United States | $23.7bn | 0.052% | -0.043 pp | -0.073 pp | -34.0% | 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.