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 REITs0.28%-0.12 ppData Center REITs0.28%-0.07 ppSelf-Storage REITs0.15%-0.07 ppMulti-Family Residential REITs0.15%-0.06 ppRetail REITs0.27%-0.05 ppHealth Care REITs0.34%+0.04 ppOffice REITs0.04%-0.03 ppOther Specialized REITs0.06%-0.03 ppHotel & Resort REITs0.08%-0.02 ppTimber REITs0.03%-0.02 ppIndustrial REITs0.23%-0.02 ppReal Estate Services0.15%-0.02 ppSingle-Family Residential REITs0.03%-0.01 pp
3 · Sub-industry
Inside Health Care REITs
Health Care REITs · weight
0.34%
Industry change · 12M
+0.04 pp
Health Care REITs · contribution
+0.037 pp
Company participation
67%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 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 |
|---|---|---|---|---|---|---|---|
| Welltower → WELL | United States | $124.3bn | 0.243% | +0.011 pp | +0.046 pp | +36.7% | Yes |
| Healthpeak Properties → DOC | United States | $12.5bn | 0.024% | -0.000 pp | -0.012 pp | -14.3% | No |
| Ventas → VTR | United States | $34.7bn | 0.068% | +0.004 pp | +0.003 pp | +16.0% | 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.