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 REITs0.45%-0.29 ppRetail REITs0.32%-0.17 ppData Center REITs0.17%-0.16 ppMulti-Family Residential REITs0.21%-0.12 ppHealth Care REITs0.20%-0.11 ppSelf-Storage REITs0.16%-0.09 ppTimber REITs0.07%-0.09 ppOffice REITs0.11%-0.08 ppIndustrial REITs0.14%-0.06 ppReal Estate Services0.05%-0.04 ppHotel & Resort REITs0.05%-0.04 ppOther Specialized REITs0.03%-0.02 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Data Center REITs
Data Center REITs · weight
0.17%
Industry change · 12M
-0.16 pp
Data Center REITs · contribution
-0.160 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 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 | $30.1bn | 0.102% | -0.102 pp | -0.101 pp | -15.4% | No |
| Digital Realty → DLR | United States | $21.3bn | 0.072% | -0.074 pp | -0.059 pp | -5.2% | 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.