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 REITs0.39%+0.07 ppMulti-Family Residential REITs0.36%+0.07 ppSelf-Storage REITs0.30%+0.05 ppHealth Care REITs0.29%+0.03 ppTelecom Tower REITs0.85%+0.03 ppIndustrial REITs0.34%+0.03 ppData Center REITs0.37%-0.02 ppOther Specialized REITs0.06%+0.01 ppReal Estate Services0.10%-0.01 ppHotel & Resort REITs0.05%+0.01 ppTimber REITs0.11%+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
0.85%
Industry change · 12M
+0.03 pp
Telecom Tower REITs · contribution
+0.030 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 2022 · 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 |
|---|---|---|---|---|---|---|---|
| SBA Communications → SBAC | United States | $36.3bn | 0.131% | +0.016 pp | +0.014 pp | +13.8% | Yes |
| American Tower → AMT | United States | $116.9bn | 0.421% | +0.062 pp | +0.014 pp | +2.3% | Yes |
| Crown Castle → CCI | United States | $82.1bn | 0.296% | +0.046 pp | +0.002 pp | +3.1% | 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.