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
Health Care REITs0.32%+0.14 ppData Center REITs0.33%+0.10 ppTelecom Tower REITs0.38%+0.08 ppRetail REITs0.30%+0.07 ppMulti-Family Residential REITs0.20%+0.05 ppSelf-Storage REITs0.20%+0.04 ppReal Estate Services0.15%+0.04 ppIndustrial REITs0.23%+0.03 ppOther Specialized REITs0.07%+0.02 ppHotel & Resort REITs0.10%+0.02 ppOffice REITs0.05%-0.01 ppSingle-Family Residential REITs0.05%+0.01 ppTimber REITs0.04%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.38%
Industry change · 12M
+0.08 pp
Telecom Tower REITs · contribution
+0.083 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 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 | $100.5bn | 0.228% | +0.013 pp | +0.053 pp | +13.3% | Yes |
| SBA Communications → SBAC | United States | $24.9bn | 0.056% | +0.004 pp | +0.016 pp | +20.2% | Yes |
| Crown Castle → CCI | United States | $43.7bn | 0.099% | +0.008 pp | +0.014 pp | +4.1% | 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.