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 Real Estate Services
Real Estate Services · weight
0.15%
Industry change · 12M
-0.02 pp
Real Estate Services · contribution
-0.018 pp
Company participation
0%
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 |
|---|---|---|---|---|---|---|---|
| CoStar Group → CSGP | United States | $29.2bn | 0.057% | -0.028 pp | -0.013 pp | -5.5% | No |
| CBRE Group → CBRE | United States | $45.4bn | 0.089% | -0.009 pp | -0.005 pp | +16.4% | 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.