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 & Defense2.70%+0.50 ppConstruction Machinery & Heavy Transportation Equipment0.94%+0.22 ppConstruction & Engineering0.30%+0.17 ppHeavy Electrical Equipment0.39%+0.15 ppHuman Resource & Employment Services0.26%-0.13 ppIndustrial Machinery & Supplies & Components0.95%-0.11 ppDiversified Support Services0.27%-0.08 ppRail Transportation0.53%-0.08 ppResearch & Consulting Services0.11%-0.06 ppEnvironmental & Facilities Services0.40%-0.05 ppIndustrial Conglomerates0.55%-0.04 ppBuilding Products0.51%-0.04 ppTrading Companies & Distributors0.19%+0.03 ppPassenger Airlines0.19%-0.02 ppCargo Ground Transportation0.11%-0.02 ppData Processing & Outsourced Services0.04%-0.02 ppAgricultural & Farm Machinery0.27%-0.01 ppAir Freight & Logistics0.35%-0.01 ppElectrical Components & Equipment0.61%-0.01 ppPassenger Ground Transportation0.32%+0.01 pp
3 · Sub-industry
Inside Construction & Engineering
Construction & Engineering · weight
0.30%
Industry change · 12M
+0.17 pp
Construction & Engineering · contribution
+0.166 pp
Company participation
75%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2026 · 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 |
|---|---|---|---|---|---|---|---|
| Comfort Systems USA → FIX | United States | $40.3bn | 0.077% | +0.077 pp | +0.077 pp | +162.4% | Yes |
| Emcor → EME | United States | $32.3bn | 0.062% | +0.002 pp | +0.062 pp | +61.2% | Yes |
| Quanta Services → PWR | United States | $70.8bn | 0.135% | +0.004 pp | +0.034 pp | +54.5% | Yes |
| Jacobs Solutions → J | United States | $16.1bn | 0.031% | -0.006 pp | -0.008 pp | -1.6% | 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.