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
Industrial Conglomerates0.29%-0.25 ppConstruction Machinery & Heavy Transportation Equipment0.93%+0.23 ppAerospace & Defense2.39%-0.19 ppConstruction & Engineering0.33%+0.17 ppPassenger Ground Transportation0.26%-0.15 ppElectrical Components & Equipment0.74%+0.13 ppIndustrial Machinery & Supplies & Components0.82%-0.12 ppEnvironmental & Facilities Services0.33%-0.12 ppDiversified Support Services0.21%-0.11 ppBuilding Products0.46%-0.11 ppHuman Resource & Employment Services0.26%-0.09 ppResearch & Consulting Services0.08%-0.06 ppRail Transportation0.58%+0.05 ppCargo Ground Transportation0.14%+0.05 ppHeavy Electrical Equipment0.42%+0.05 ppAir Freight & Logistics0.32%+0.04 ppTrading Companies & Distributors0.27%+0.03 ppData Processing & Outsourced Services0.03%-0.03 ppAgricultural & Farm Machinery0.29%+0.03 ppPassenger Airlines0.18%-0.01 pp
3 · Sub-industry
Inside Trading Companies & Distributors
Trading Companies & Distributors · weight
0.27%
Industry change · 12M
+0.03 pp
Trading Companies & Distributors · contribution
+0.029 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 |
|---|---|---|---|---|---|---|---|
| Ferguson Enterprises → FERG | United States | $43.4bn | 0.072% | +0.072 pp | +0.072 pp | -1.0% | Yes |
| Fastenal → FAST | United States | $56.6bn | 0.094% | +0.006 pp | -0.024 pp | +1.5% | Yes |
| United Rentals → URI | United States | $65.0bn | 0.108% | +0.000 pp | -0.019 pp | +9.4% | 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.