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 REITs0.38%+0.38 ppData Center REITs0.19%+0.19 ppRetail REITs0.16%+0.16 ppIndustrial REITs0.15%+0.15 ppMulti-Family Residential REITs0.14%+0.14 ppHealth Care REITs0.13%+0.13 ppSelf-Storage REITs0.11%+0.11 ppOffice REITs0.07%+0.07 ppReal Estate Services0.05%+0.05 ppTimber REITs0.05%+0.05 ppHotel & Resort REITs0.02%+0.02 ppOther Specialized REITs0.02%+0.02 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.38%
Industry change · 12M
+0.38 pp
Telecom Tower REITs · contribution
+0.381 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 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 |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $96.0bn | 0.192% | -0.244 pp | +0.192 pp | -2.9% | No |
| Crown Castle → CCI | United States | $67.2bn | 0.134% | -0.173 pp | +0.134 pp | +12.1% | No |
| SBA Communications → SBAC | United States | $27.9bn | 0.056% | -0.080 pp | +0.056 pp | -3.1% | 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.