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 REITs1.04%+0.62 ppHealth Care REITs0.44%+0.25 ppMulti-Family Residential REITs0.44%+0.23 ppData Center REITs0.40%+0.20 ppRetail REITs0.51%+0.20 ppSelf-Storage REITs0.34%+0.18 ppIndustrial REITs0.29%+0.17 ppOffice REITs0.20%+0.09 ppReal Estate Services0.10%+0.04 ppTimber REITs0.11%+0.02 ppOther Specialized REITs0.05%+0.02 ppHotel & Resort REITs0.06%+0.01 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
1.04%
Industry change · 12M
+0.62 pp
Telecom Tower REITs · contribution
+0.621 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $101.9bn | 0.554% | +0.017 pp | +0.342 pp | +57.5% | Yes |
| Crown Castle → CCI | United States | $60.4bn | 0.328% | +0.013 pp | +0.176 pp | +32.1% | Yes |
| SBA Communications → SBAC | United States | $29.7bn | 0.161% | +0.019 pp | +0.104 pp | +69.3% | 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.