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 REITs0.22%-0.11 ppReal Estate Services0.09%-0.09 ppHealth Care REITs0.38%+0.06 ppMulti-Family Residential REITs0.13%-0.04 ppRetail REITs0.26%-0.03 ppSelf-Storage REITs0.14%-0.03 ppHotel & Resort REITs0.07%-0.03 ppOffice REITs0.03%-0.02 ppSingle-Family Residential REITs0.03%-0.01 ppTimber REITs0.03%-0.01 ppData Center REITs0.28%+0.00 ppIndustrial REITs0.22%-0.00 ppOther Specialized REITs0.06%+0.00 pp
3 · Sub-industry
Inside Real Estate Services
Real Estate Services · weight
0.09%
Industry change · 12M
-0.09 pp
Real Estate Services · contribution
-0.087 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 2026 · 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 | $13.0bn | 0.022% | -0.001 pp | -0.057 pp | -64.2% | Yes |
| CBRE Group → CBRE | United States | $42.2bn | 0.070% | +0.007 pp | -0.030 pp | -10.1% | 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.