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
Retail REITs0.36%+0.08 ppTelecom Tower REITs0.80%-0.08 ppIndustrial REITs0.38%+0.06 ppSelf-Storage REITs0.28%+0.06 ppMulti-Family Residential REITs0.32%+0.05 ppReal Estate Services0.11%+0.02 ppData Center REITs0.41%-0.02 ppHealth Care REITs0.24%-0.01 ppOther Specialized REITs0.04%+0.01 ppHotel & Resort REITs0.04%-0.00 ppTimber REITs0.10%+0.00 ppOffice REITs0.16%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.80%
Industry change · 12M
-0.08 pp
Telecom Tower REITs · contribution
-0.083 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2021 · 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 | $78.5bn | 0.265% | -0.016 pp | -0.042 pp | +11.8% | No |
| American Tower → AMT | United States | $119.5bn | 0.404% | -0.041 pp | -0.032 pp | +15.8% | No |
| SBA Communications → SBAC | United States | $37.4bn | 0.126% | -0.005 pp | -0.009 pp | +20.6% | 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.