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 REITs0.33%-0.10 ppIndustrial REITs0.22%-0.07 ppSelf-Storage REITs0.17%-0.07 ppMulti-Family Residential REITs0.18%-0.05 ppHealth Care REITs0.32%+0.05 ppRetail REITs0.29%-0.04 ppData Center REITs0.28%-0.03 ppOffice REITs0.05%-0.03 ppOther Specialized REITs0.06%-0.02 ppReal Estate Services0.18%+0.02 ppHotel & Resort REITs0.10%-0.02 ppTimber REITs0.04%-0.01 ppSingle-Family Residential REITs0.04%-0.01 pp
3 · Sub-industry
Inside Self-Storage REITs
Self-Storage REITs · weight
0.17%
Industry change · 12M
-0.07 pp
Self-Storage REITs · contribution
-0.066 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 |
|---|---|---|---|---|---|---|---|
| Public Storage → PSA | United States | $51.7bn | 0.107% | -0.015 pp | -0.038 pp | -11.0% | No |
| Extra Space Storage → EXR | United States | $30.5bn | 0.063% | -0.010 pp | -0.027 pp | -15.4% | 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.