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 REITs0.36%-0.11 ppIndustrial REITs0.26%-0.10 ppHealth Care REITs0.32%+0.09 ppData Center REITs0.31%-0.06 ppSelf-Storage REITs0.19%-0.04 ppHotel & Resort REITs0.10%-0.03 ppRetail REITs0.32%-0.03 ppOffice REITs0.06%-0.03 ppTimber REITs0.05%-0.02 ppReal Estate Services0.17%-0.02 ppSingle-Family Residential REITs0.05%-0.01 ppOther Specialized REITs0.06%-0.00 ppMulti-Family Residential REITs0.21%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.36%
Industry change · 12M
-0.11 pp
Telecom Tower REITs · contribution
-0.108 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 2025 · 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 | $96.1bn | 0.215% | -0.001 pp | -0.051 pp | +6.9% | No |
| Crown Castle → CCI | United States | $40.9bn | 0.091% | -0.010 pp | -0.045 pp | -9.2% | No |
| SBA Communications → SBAC | United States | $23.4bn | 0.052% | -0.001 pp | -0.012 pp | +6.1% | 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.