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 REITs0.82%-0.14 ppData Center REITs0.40%-0.09 ppRetail REITs0.33%+0.08 ppMulti-Family Residential REITs0.32%+0.07 ppReal Estate Services0.12%+0.04 ppSelf-Storage REITs0.28%+0.02 ppOffice REITs0.16%+0.01 ppIndustrial REITs0.36%+0.01 ppOther Specialized REITs0.04%+0.01 ppTimber REITs0.09%-0.01 ppHotel & Resort REITs0.04%+0.01 ppHealth Care REITs0.25%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Self-Storage REITs
Self-Storage REITs · weight
0.28%
Industry change · 12M
+0.02 pp
Self-Storage REITs · contribution
+0.022 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 2021 · 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 |
|---|---|---|---|---|---|---|---|
| Extra Space Storage → EXR | United States | $26.4bn | 0.088% | +0.008 pp | +0.017 pp | +75.2% | Yes |
| Public Storage → PSA | United States | $58.2bn | 0.194% | +0.007 pp | +0.005 pp | +49.5% | 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.