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%+0.82 ppData Center REITs0.39%+0.39 ppRetail REITs0.32%+0.32 ppIndustrial REITs0.31%+0.31 ppMulti-Family Residential REITs0.29%+0.29 ppHealth Care REITs0.25%+0.25 ppSelf-Storage REITs0.25%+0.25 ppOffice REITs0.16%+0.16 ppReal Estate Services0.11%+0.11 ppTimber REITs0.10%+0.10 ppOther Specialized REITs0.05%+0.04 ppHotel & Resort REITs0.04%+0.04 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Self-Storage REITs
Self-Storage REITs · weight
0.25%
Industry change · 12M
+0.25 pp
Self-Storage REITs · contribution
+0.249 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 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 |
|---|---|---|---|---|---|---|---|
| Public Storage → PSA | United States | $49.4bn | 0.177% | +0.095 pp | +0.177 pp | +44.5% | Yes |
| Extra Space Storage → EXR | United States | $20.0bn | 0.072% | +0.039 pp | +0.072 pp | +60.1% | 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.