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 REITs0.45%-0.17 ppIndustrial REITs0.33%-0.06 ppMulti-Family Residential REITs0.22%-0.05 ppSelf-Storage REITs0.23%-0.03 ppHotel & Resort REITs0.13%-0.03 ppReal Estate Services0.19%+0.02 ppData Center REITs0.34%+0.02 ppOther Specialized REITs0.07%+0.01 ppOffice REITs0.09%-0.01 ppRetail REITs0.34%-0.01 ppSingle-Family Residential REITs0.06%-0.00 ppHealth Care REITs0.22%+0.00 ppTimber REITs0.07%-0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.45%
Industry change · 12M
-0.17 pp
Telecom Tower REITs · contribution
-0.171 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 2024 · 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 |
|---|---|---|---|---|---|---|---|
| Crown Castle → CCI | United States | $46.0bn | 0.127% | -0.022 pp | -0.070 pp | -16.2% | No |
| American Tower → AMT | United States | $92.1bn | 0.256% | -0.045 pp | -0.069 pp | -0.0% | No |
| SBA Communications → SBAC | United States | $23.4bn | 0.065% | -0.017 pp | -0.031 pp | -15.7% | 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.