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
Health Care REITs0.34%+0.09 ppIndustrial REITs0.23%-0.05 ppOffice REITs0.05%-0.03 ppRetail REITs0.31%-0.03 ppReal Estate Services0.16%-0.02 ppHotel & Resort REITs0.10%-0.02 ppTelecom Tower REITs0.43%+0.02 ppTimber REITs0.05%-0.02 ppSelf-Storage REITs0.20%-0.01 ppMulti-Family Residential REITs0.21%-0.01 ppData Center REITs0.33%+0.01 ppSingle-Family Residential REITs0.05%-0.01 ppOther Specialized REITs0.06%-0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.43%
Industry change · 12M
+0.02 pp
Telecom Tower REITs · contribution
+0.019 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2025 · 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 | $105.5bn | 0.253% | +0.061 pp | +0.021 pp | +35.7% | Yes |
| Crown Castle → CCI | United States | $46.1bn | 0.111% | +0.024 pp | -0.007 pp | +19.9% | Yes |
| SBA Communications → SBAC | United States | $26.2bn | 0.063% | +0.016 pp | +0.005 pp | +33.3% | 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.