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 REITs0.50%-0.15 ppData Center REITs0.36%+0.08 ppSelf-Storage REITs0.22%-0.06 ppMulti-Family Residential REITs0.23%-0.06 ppIndustrial REITs0.32%-0.05 ppOffice REITs0.08%-0.04 ppRetail REITs0.32%-0.04 ppHealth Care REITs0.24%+0.04 ppReal Estate Services0.17%-0.03 ppHotel & Resort REITs0.14%-0.02 ppTimber REITs0.07%-0.01 ppSingle-Family Residential REITs0.06%-0.01 ppOther Specialized REITs0.06%+0.01 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.50%
Industry change · 12M
-0.15 pp
Telecom Tower REITs · contribution
-0.154 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 2023 · 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 | $40.3bn | 0.137% | +0.035 pp | -0.068 pp | -26.4% | Yes |
| American Tower → AMT | United States | $83.1bn | 0.282% | +0.089 pp | -0.060 pp | -11.1% | Yes |
| SBA Communications → SBAC | United States | $22.6bn | 0.077% | +0.025 pp | -0.026 pp | -21.6% | 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.