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 REITs0.33%-0.10 ppIndustrial REITs0.22%-0.07 ppSelf-Storage REITs0.17%-0.07 ppMulti-Family Residential REITs0.18%-0.05 ppHealth Care REITs0.32%+0.05 ppRetail REITs0.29%-0.04 ppData Center REITs0.28%-0.03 ppOffice REITs0.05%-0.03 ppOther Specialized REITs0.06%-0.02 ppReal Estate Services0.18%+0.02 ppHotel & Resort REITs0.10%-0.02 ppTimber REITs0.04%-0.01 ppSingle-Family Residential REITs0.04%-0.01 pp
3 · Sub-industry
Inside Health Care REITs
Health Care REITs · weight
0.32%
Industry change · 12M
+0.05 pp
Health Care REITs · contribution
+0.046 pp
Company participation
33%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $112.5bn | 0.233% | +0.005 pp | +0.056 pp | +42.0% | Yes |
| Healthpeak Properties → DOC | United States | $12.5bn | 0.026% | -0.002 pp | -0.012 pp | -14.7% | No |
| Ventas → VTR | United States | $30.9bn | 0.064% | -0.002 pp | +0.002 pp | +12.9% | 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.