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 & Defense2.56%+0.47 ppConstruction Machinery & Heavy Transportation Equipment0.85%+0.14 ppHeavy Electrical Equipment0.36%+0.14 ppConstruction & Engineering0.27%+0.13 ppIndustrial Machinery & Supplies & Components0.92%-0.10 ppHuman Resource & Employment Services0.28%-0.10 ppBuilding Products0.50%-0.07 ppDiversified Support Services0.27%-0.07 ppAir Freight & Logistics0.32%-0.07 ppIndustrial Conglomerates0.52%-0.06 ppElectrical Components & Equipment0.57%-0.06 ppRail Transportation0.53%-0.05 ppResearch & Consulting Services0.11%-0.05 ppPassenger Ground Transportation0.33%+0.04 ppTrading Companies & Distributors0.19%+0.04 ppEnvironmental & Facilities Services0.41%-0.03 ppCargo Ground Transportation0.10%-0.02 ppAgricultural & Farm Machinery0.25%-0.01 ppData Processing & Outsourced Services0.05%-0.01 ppPassenger Airlines0.20%-0.01 pp
3 · Sub-industry
Inside Construction & Engineering
Construction & Engineering · weight
0.27%
Industry change · 12M
+0.13 pp
Construction & Engineering · contribution
+0.129 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Dec 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 |
|---|---|---|---|---|---|---|---|
| Comfort Systems USA → FIX | United States | $32.9bn | 0.064% | +0.064 pp | +0.064 pp | +120.9% | Yes |
| Emcor → EME | United States | $27.4bn | 0.054% | -0.005 pp | +0.054 pp | +35.1% | Yes |
| Quanta Services → PWR | United States | $62.9bn | 0.123% | -0.000 pp | +0.017 pp | +33.7% | No |
| Jacobs Solutions → J | United States | $15.7bn | 0.031% | -0.005 pp | -0.006 pp | +1.1% | 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.