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 REITs0.33%-0.16 ppIndustrial REITs0.25%-0.10 ppHealth Care REITs0.28%+0.05 ppSelf-Storage REITs0.19%-0.05 ppData Center REITs0.32%-0.04 ppHotel & Resort REITs0.10%-0.04 ppRetail REITs0.30%-0.03 ppOffice REITs0.06%-0.03 ppMulti-Family Residential REITs0.20%-0.02 ppTimber REITs0.05%-0.02 ppSingle-Family Residential REITs0.04%-0.02 ppReal Estate Services0.17%-0.01 ppOther Specialized REITs0.07%+0.01 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.33%
Industry change · 12M
-0.16 pp
Telecom Tower REITs · contribution
-0.157 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 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 | $86.4bn | 0.192% | -0.042 pp | -0.079 pp | -2.3% | No |
| Crown Castle → CCI | United States | $38.8bn | 0.086% | -0.024 pp | -0.053 pp | -12.5% | No |
| SBA Communications → SBAC | United States | $21.2bn | 0.047% | -0.011 pp | -0.025 pp | -10.1% | 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.