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 REITs0.29%-0.09 ppIndustrial REITs0.19%-0.07 ppReal Estate Services0.11%-0.03 ppMulti-Family Residential REITs0.16%-0.03 ppData Center REITs0.22%-0.02 ppHotel & Resort REITs0.08%-0.02 ppHealth Care REITs0.18%+0.02 ppTimber REITs0.04%-0.02 ppRetail REITs0.23%-0.01 ppOther Specialized REITs0.05%+0.01 ppOffice REITs0.06%-0.01 ppSelf-Storage REITs0.16%-0.01 ppSingle-Family Residential REITs0.04%-0.01 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.29%
Industry change · 12M
-0.09 pp
Telecom Tower REITs · contribution
-0.092 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jun 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 |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $90.8bn | 0.170% | -0.085 pp | -0.039 pp | +3.8% | No |
| Crown Castle → CCI | United States | $42.5bn | 0.080% | -0.048 pp | -0.035 pp | -9.0% | No |
| SBA Communications → SBAC | United States | $21.1bn | 0.040% | -0.025 pp | -0.019 pp | -13.9% | 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.