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 Industrials
Aerospace & Defense4.00%+4.00 ppIndustrial Machinery & Supplies & Components1.14%+1.14 ppIndustrial Conglomerates1.05%+1.05 ppRail Transportation0.96%+0.96 ppAir Freight & Logistics0.79%+0.79 ppElectrical Components & Equipment0.66%+0.66 ppConstruction Machinery & Heavy Transportation Equipment0.63%+0.62 ppBuilding Products0.62%+0.62 ppHuman Resource & Employment Services0.45%+0.45 ppEnvironmental & Facilities Services0.41%+0.41 ppAgricultural & Farm Machinery0.39%+0.39 ppPassenger Airlines0.24%+0.24 ppResearch & Consulting Services0.21%+0.21 ppTrading Companies & Distributors0.14%+0.14 ppDiversified Support Services0.12%+0.12 ppCargo Ground Transportation0.11%+0.11 ppConstruction & Engineering0.09%+0.09 ppHeavy Electrical Equipment0.09%+0.09 ppData Processing & Outsourced Services0.07%+0.07 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.96%
Industry change · 12M
+0.96 pp
Rail Transportation · contribution
+0.956 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 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 |
|---|---|---|---|---|---|---|---|
| Union Pacific Corporation → UNP | United States | $142.7bn | 0.489% | -0.046 pp | +0.489 pp | +28.6% | Yes |
| CSX Corporation → CSX | United States | $72.9bn | 0.250% | +0.158 pp | +0.250 pp | +37.6% | Yes |
| Norfolk Southern → NSC | United States | $63.7bn | 0.218% | -0.035 pp | +0.218 pp | +36.4% | 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.