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
Data Center REITs0.31%-0.02 ppHealth Care REITs0.28%-0.02 ppSelf-Storage REITs0.27%+0.01 ppMulti-Family Residential REITs0.33%-0.01 ppTelecom Tower REITs0.75%+0.01 ppRetail REITs0.49%-0.01 ppReal Estate Services0.10%+0.01 ppHotel & Resort REITs0.08%-0.01 ppIndustrial REITs0.19%-0.00 ppTimber REITs0.16%-0.00 ppOther Specialized REITs0.05%+0.00 ppOffice REITs0.18%-0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Data Center REITs
Data Center REITs · weight
0.31%
Industry change · 12M
-0.02 pp
Data Center REITs · contribution
-0.024 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 2018 · 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 |
|---|---|---|---|---|---|---|---|
| Equinix → EQIX | United States | $31.1bn | 0.186% | -0.017 pp | -0.017 pp | -13.4% | No |
| Digital Realty → DLR | United States | $20.7bn | 0.124% | -0.007 pp | -0.007 pp | -10.1% | 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.