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
Passenger Ground Transportation0.38%+0.38 ppIndustrial Conglomerates0.68%-0.19 ppAerospace & Defense2.41%-0.17 ppAgricultural & Farm Machinery0.33%-0.13 ppIndustrial Machinery & Supplies & Components1.21%+0.12 ppAir Freight & Logistics0.57%-0.10 ppHuman Resource & Employment Services0.41%-0.09 ppRail Transportation0.81%-0.09 ppDiversified Support Services0.23%+0.08 ppEnvironmental & Facilities Services0.49%+0.05 ppConstruction Machinery & Heavy Transportation Equipment0.77%+0.05 ppTrading Companies & Distributors0.17%+0.03 ppPassenger Airlines0.17%-0.02 ppElectrical Components & Equipment0.67%+0.02 ppData Processing & Outsourced Services0.07%+0.02 ppConstruction & Engineering0.13%+0.02 ppBuilding Products0.52%+0.01 ppResearch & Consulting Services0.19%+0.01 ppCargo Ground Transportation0.13%+0.01 ppHeavy Electrical Equipment0.02%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.81%
Industry change · 12M
-0.09 pp
Rail Transportation · contribution
-0.090 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Dec 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 |
|---|---|---|---|---|---|---|---|
| Norfolk Southern → NSC | United States | $53.5bn | 0.159% | +0.010 pp | -0.046 pp | -1.6% | Yes |
| CSX Corporation → CSX | United States | $68.5bn | 0.204% | -0.002 pp | -0.031 pp | +13.5% | Yes |
| Union Pacific Corporation → UNP | United States | $149.7bn | 0.447% | +0.032 pp | -0.013 pp | +21.6% | 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.