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 REITs0.29%+0.03 ppMulti-Family Residential REITs0.36%+0.03 ppIndustrial REITs0.21%+0.02 ppRetail REITs0.51%+0.01 ppTimber REITs0.17%+0.01 ppOffice REITs0.19%+0.01 ppOther Specialized REITs0.06%+0.01 ppReal Estate Services0.09%+0.01 ppData Center REITs0.34%+0.00 ppTelecom Tower REITs0.74%-0.00 ppHealth Care REITs0.30%-0.00 ppHotel & Resort REITs0.09%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.74%
Industry change · 12M
-0.00 pp
Telecom Tower REITs · contribution
-0.003 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 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 |
|---|---|---|---|---|---|---|---|
| Crown Castle → CCI | United States | $41.0bn | 0.252% | -0.009 pp | -0.009 pp | -9.7% | No |
| American Tower → AMT | United States | $60.1bn | 0.369% | +0.008 pp | +0.008 pp | -7.2% | No |
| SBA Communications → SBAC | United States | $18.7bn | 0.115% | -0.002 pp | -0.002 pp | -8.2% | 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.