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 & Defense2.22%-1.78 ppIndustrial Conglomerates0.81%-0.24 ppBuilding Products0.46%-0.16 ppIndustrial Machinery & Supplies & Components1.03%-0.12 ppElectrical Components & Equipment0.59%-0.07 ppHuman Resource & Employment Services0.50%+0.06 ppPassenger Airlines0.19%-0.05 ppEnvironmental & Facilities Services0.45%+0.04 ppAir Freight & Logistics0.75%-0.04 ppHeavy Electrical Equipment0.06%-0.03 ppRail Transportation0.93%-0.03 ppAgricultural & Farm Machinery0.36%-0.03 ppConstruction & Engineering0.12%+0.03 ppResearch & Consulting Services0.19%-0.02 ppConstruction Machinery & Heavy Transportation Equipment0.60%-0.02 ppCargo Ground Transportation0.12%+0.01 ppTrading Companies & Distributors0.13%-0.01 ppData Processing & Outsourced Services0.06%-0.00 ppDiversified Support Services0.11%-0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.93%
Industry change · 12M
-0.03 pp
Rail Transportation · contribution
-0.029 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 2022 · 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 |
|---|---|---|---|---|---|---|---|
| Norfolk Southern → NSC | United States | $59.0bn | 0.203% | -0.019 pp | -0.016 pp | -0.9% | No |
| CSX Corporation → CSX | United States | $69.2bn | 0.238% | -0.032 pp | -0.012 pp | +1.2% | No |
| Union Pacific Corporation → UNP | United States | $141.9bn | 0.488% | -0.044 pp | -0.001 pp | +6.0% | 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.