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 REITs0.79%+0.05 ppSelf-Storage REITs0.28%+0.03 ppMulti-Family Residential REITs0.36%+0.02 ppRetail REITs0.51%+0.01 ppOffice REITs0.19%+0.01 ppReal Estate Services0.10%+0.01 ppIndustrial REITs0.21%+0.01 ppHealth Care REITs0.30%-0.01 ppOther Specialized REITs0.06%+0.00 ppHotel & Resort REITs0.08%-0.00 ppData Center REITs0.34%+0.00 ppTimber REITs0.16%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.79%
Industry change · 12M
+0.05 pp
Telecom Tower REITs · contribution
+0.049 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 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 |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $64.1bn | 0.393% | +0.032 pp | +0.032 pp | -1.6% | Yes |
| Crown Castle → CCI | United States | $44.6bn | 0.274% | +0.012 pp | +0.012 pp | -1.9% | Yes |
| SBA Communications → SBAC | United States | $19.9bn | 0.122% | +0.005 pp | +0.005 pp | -2.1% | 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.