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 & Defense2.55%+0.35 ppIndustrial Machinery & Supplies & Components0.89%-0.20 ppAir Freight & Logistics0.30%-0.12 ppHeavy Electrical Equipment0.33%+0.11 ppHuman Resource & Employment Services0.29%-0.11 ppRail Transportation0.51%-0.10 ppDiversified Support Services0.27%-0.10 ppConstruction & Engineering0.23%+0.08 ppConstruction Machinery & Heavy Transportation Equipment0.82%+0.08 ppEnvironmental & Facilities Services0.39%-0.08 ppResearch & Consulting Services0.11%-0.06 ppIndustrial Conglomerates0.52%-0.06 ppCargo Ground Transportation0.09%-0.05 ppPassenger Ground Transportation0.39%+0.04 ppPassenger Airlines0.16%-0.03 ppTrading Companies & Distributors0.20%+0.02 ppAgricultural & Farm Machinery0.24%-0.02 ppBuilding Products0.54%-0.01 ppElectrical Components & Equipment0.62%-0.01 ppData Processing & Outsourced Services0.05%-0.01 pp
3 · Sub-industry
Inside Construction & Engineering
Construction & Engineering · weight
0.23%
Industry change · 12M
+0.08 pp
Construction & Engineering · contribution
+0.082 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 2025 · 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 |
|---|---|---|---|---|---|---|---|
| Emcor → EME | United States | $30.3bn | 0.059% | +0.059 pp | +0.059 pp | +51.8% | Yes |
| Quanta Services → PWR | United States | $67.0bn | 0.131% | +0.004 pp | +0.027 pp | +49.1% | Yes |
| Jacobs Solutions → J | United States | $18.6bn | 0.036% | +0.001 pp | -0.004 pp | +12.7% | 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.