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 REITs0.23%-0.12 ppReal Estate Services0.09%-0.09 ppHealth Care REITs0.40%+0.08 ppMulti-Family Residential REITs0.14%-0.03 ppIndustrial REITs0.24%+0.03 ppHotel & Resort REITs0.08%-0.02 ppOffice REITs0.04%-0.01 ppRetail REITs0.29%+0.01 ppSingle-Family Residential REITs0.03%-0.01 ppSelf-Storage REITs0.15%-0.01 ppTimber REITs0.03%-0.01 ppData Center REITs0.29%+0.00 ppOther Specialized REITs0.06%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.23%
Industry change · 12M
-0.12 pp
Telecom Tower REITs · contribution
-0.121 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 2026 · 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 | $80.8bn | 0.141% | +0.026 pp | -0.065 pp | -13.6% | Yes |
| Crown Castle → CCI | United States | $33.3bn | 0.058% | +0.006 pp | -0.038 pp | -23.9% | Yes |
| SBA Communications → SBAC | United States | $19.2bn | 0.034% | +0.002 pp | -0.017 pp | -17.6% | 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.