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 REITs0.92%+0.14 ppTimber REITs0.11%-0.06 ppIndustrial REITs0.27%+0.06 ppHealth Care REITs0.39%+0.05 ppRetail REITs0.51%-0.04 ppMulti-Family Residential REITs0.40%+0.03 ppHotel & Resort REITs0.07%-0.02 ppSelf-Storage REITs0.30%-0.02 ppData Center REITs0.36%+0.01 ppOther Specialized REITs0.05%-0.01 ppReal Estate Services0.09%-0.01 ppOffice REITs0.19%-0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.92%
Industry change · 12M
+0.14 pp
Telecom Tower REITs · contribution
+0.144 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jun 2019 · 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 | $90.4bn | 0.487% | -0.012 pp | +0.101 pp | +44.7% | Yes |
| SBA Communications → SBAC | United States | $25.5bn | 0.137% | +0.008 pp | +0.022 pp | +36.2% | Yes |
| Crown Castle → CCI | United States | $54.2bn | 0.292% | -0.013 pp | +0.021 pp | +25.4% | 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.