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
Hotel & Resort REITs0.16%+0.11 ppMulti-Family Residential REITs0.36%+0.07 ppRetail REITs0.38%+0.06 ppSelf-Storage REITs0.30%+0.04 ppData Center REITs0.38%-0.03 ppIndustrial REITs0.34%+0.03 ppTelecom Tower REITs0.87%+0.03 ppHealth Care REITs0.28%+0.02 ppOther Specialized REITs0.06%+0.01 ppOffice REITs0.15%-0.01 ppReal Estate Services0.09%-0.01 ppTimber REITs0.10%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.87%
Industry change · 12M
+0.03 pp
Telecom Tower REITs · contribution
+0.026 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jun 2022 · 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 | $116.6bn | 0.454% | +0.068 pp | +0.029 pp | -3.4% | Yes |
| Crown Castle → CCI | United States | $72.9bn | 0.284% | +0.015 pp | -0.014 pp | -10.9% | Yes |
| SBA Communications → SBAC | United States | $34.5bn | 0.134% | +0.009 pp | +0.011 pp | +1.2% | 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.