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 REITs0.41%-0.19 ppIndustrial REITs0.27%-0.12 ppMulti-Family Residential REITs0.23%-0.05 ppSelf-Storage REITs0.21%-0.03 ppHotel & Resort REITs0.12%-0.03 ppHealth Care REITs0.25%+0.02 ppOffice REITs0.09%-0.01 ppOther Specialized REITs0.07%+0.01 ppTimber REITs0.06%-0.01 ppRetail REITs0.34%-0.01 ppSingle-Family Residential REITs0.06%-0.01 ppData Center REITs0.32%-0.00 ppReal Estate Services0.19%-0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.41%
Industry change · 12M
-0.19 pp
Telecom Tower REITs · contribution
-0.189 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 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 | $80.1bn | 0.232% | -0.039 pp | -0.090 pp | -13.1% | No |
| Crown Castle → CCI | United States | $40.7bn | 0.118% | -0.022 pp | -0.062 pp | -19.3% | No |
| SBA Communications → SBAC | United States | $20.1bn | 0.058% | -0.014 pp | -0.037 pp | -27.5% | 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.