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 REITs0.49%-0.33 ppReal Estate Services0.19%+0.10 ppMulti-Family Residential REITs0.26%-0.07 ppSingle-Family Residential REITs0.07%+0.07 ppSelf-Storage REITs0.24%-0.06 ppRetail REITs0.33%-0.04 ppOffice REITs0.10%-0.04 ppIndustrial REITs0.37%+0.04 ppHotel & Resort REITs0.14%-0.02 ppData Center REITs0.36%+0.02 ppHealth Care REITs0.23%-0.02 ppTimber REITs0.08%-0.01 ppOther Specialized REITs0.06%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.49%
Industry change · 12M
-0.33 pp
Telecom Tower REITs · contribution
-0.328 pp
Company participation
67%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $84.5bn | 0.269% | +0.057 pp | -0.154 pp | -26.4% | Yes |
| Crown Castle → CCI | United States | $43.6bn | 0.139% | +0.018 pp | -0.126 pp | -38.4% | No |
| SBA Communications → SBAC | United States | $24.3bn | 0.078% | +0.018 pp | -0.048 pp | -30.0% | 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.