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 & Defense2.45%+0.26 ppRail Transportation0.85%-0.16 ppConstruction Machinery & Heavy Transportation Equipment0.72%+0.12 ppIndustrial Conglomerates0.81%-0.09 ppAir Freight & Logistics0.69%-0.09 ppAgricultural & Farm Machinery0.43%+0.04 ppDiversified Support Services0.14%+0.04 ppHeavy Electrical Equipment0.03%-0.03 ppHuman Resource & Employment Services0.46%+0.03 ppBuilding Products0.53%-0.03 ppConstruction & Engineering0.12%+0.02 ppTrading Companies & Distributors0.15%+0.02 ppIndustrial Machinery & Supplies & Components1.12%+0.02 ppEnvironmental & Facilities Services0.41%+0.01 ppResearch & Consulting Services0.19%-0.01 ppElectrical Components & Equipment0.63%+0.01 ppPassenger Airlines0.21%-0.01 ppCargo Ground Transportation0.13%+0.00 ppData Processing & Outsourced Services0.06%-0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.85%
Industry change · 12M
-0.16 pp
Rail Transportation · contribution
-0.160 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2023 · 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 | $125.5bn | 0.430% | -0.001 pp | -0.099 pp | -14.6% | No |
| CSX Corporation → CSX | United States | $65.0bn | 0.222% | +0.006 pp | -0.033 pp | -8.5% | No |
| Norfolk Southern → NSC | United States | $56.9bn | 0.195% | +0.007 pp | -0.028 pp | -7.8% | 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.