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 REITs0.46%-0.28 ppRetail REITs0.33%-0.17 ppData Center REITs0.18%-0.15 ppMulti-Family Residential REITs0.22%-0.11 ppTimber REITs0.07%-0.10 ppHealth Care REITs0.21%-0.09 ppSelf-Storage REITs0.16%-0.09 ppOffice REITs0.11%-0.07 ppIndustrial REITs0.14%-0.06 ppHotel & Resort REITs0.05%-0.04 ppReal Estate Services0.05%-0.04 ppOther Specialized REITs0.03%-0.02 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.46%
Industry change · 12M
-0.28 pp
Telecom Tower REITs · contribution
-0.276 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2018 · 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 | $72.5bn | 0.241% | +0.029 pp | -0.121 pp | +13.2% | No |
| Crown Castle → CCI | United States | $47.7bn | 0.158% | +0.006 pp | -0.103 pp | +4.9% | No |
| SBA Communications → SBAC | United States | $19.4bn | 0.064% | +0.007 pp | -0.053 pp | -2.1% | 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.