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 REITs0.77%+0.29 ppIndustrial REITs0.39%+0.21 ppRetail REITs0.36%+0.20 ppSelf-Storage REITs0.30%+0.17 ppMulti-Family Residential REITs0.32%+0.17 ppHealth Care REITs0.26%+0.12 ppData Center REITs0.36%+0.11 ppOffice REITs0.16%+0.08 ppReal Estate Services0.11%+0.07 ppTimber REITs0.10%+0.05 ppOther Specialized REITs0.04%+0.02 ppHotel & Resort REITs0.04%+0.02 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.77%
Industry change · 12M
+0.29 pp
Telecom Tower REITs · contribution
+0.292 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 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 | $114.5bn | 0.385% | -0.044 pp | +0.143 pp | +12.8% | No |
| Crown Castle → CCI | United States | $78.9bn | 0.265% | +0.005 pp | +0.101 pp | +18.1% | No |
| SBA Communications → SBAC | United States | $35.4bn | 0.119% | -0.007 pp | +0.048 pp | +22.1% | 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.