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
Self-Storage REITs0.30%+0.04 ppMulti-Family Residential REITs0.36%+0.03 ppRetail REITs0.52%+0.02 ppHealth Care REITs0.32%+0.01 ppIndustrial REITs0.21%+0.01 ppTimber REITs0.17%+0.01 ppHotel & Resort REITs0.10%+0.01 ppData Center REITs0.33%-0.01 ppOffice REITs0.19%+0.01 ppReal Estate Services0.10%+0.01 ppOther Specialized REITs0.06%+0.00 ppTelecom Tower REITs0.74%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Self-Storage REITs
Self-Storage REITs · weight
0.30%
Industry change · 12M
+0.04 pp
Self-Storage REITs · contribution
+0.043 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 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 |
|---|---|---|---|---|---|---|---|
| Public Storage → PSA | United States | $36.9bn | 0.224% | +0.021 pp | +0.030 pp | +9.3% | Yes |
| Extra Space Storage → EXR | United States | $12.1bn | 0.074% | +0.009 pp | +0.014 pp | +16.3% | 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.