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%+0.45 ppData Center REITs0.37%+0.19 ppMulti-Family Residential REITs0.39%+0.16 ppIndustrial REITs0.28%+0.14 ppRetail REITs0.46%+0.14 ppHealth Care REITs0.35%+0.14 ppOffice REITs0.20%+0.09 ppSelf-Storage REITs0.25%+0.08 ppReal Estate Services0.10%+0.05 ppTimber REITs0.11%+0.05 ppHotel & Resort REITs0.07%+0.02 ppOther Specialized REITs0.04%+0.01 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.92%
Industry change · 12M
+0.45 pp
Telecom Tower REITs · contribution
+0.447 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Dec 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 | $101.8bn | 0.499% | -0.021 pp | +0.250 pp | +47.9% | No |
| Crown Castle → CCI | United States | $59.1bn | 0.290% | -0.017 pp | +0.129 pp | +35.5% | No |
| SBA Communications → SBAC | United States | $27.1bn | 0.133% | -0.012 pp | +0.068 pp | +49.3% | 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.