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 & Defense2.06%-2.04 ppIndustrial Conglomerates0.90%-0.30 ppAir Freight & Logistics0.76%-0.14 ppConstruction Machinery & Heavy Transportation Equipment0.58%-0.11 ppIndustrial Machinery & Supplies & Components1.11%-0.11 ppHeavy Electrical Equipment0.09%+0.09 ppPassenger Airlines0.21%-0.07 ppRail Transportation0.99%+0.05 ppBuilding Products0.60%+0.05 ppEnvironmental & Facilities Services0.42%+0.03 ppCargo Ground Transportation0.14%+0.03 ppDiversified Support Services0.11%-0.02 ppConstruction & Engineering0.11%+0.02 ppHuman Resource & Employment Services0.47%+0.02 ppResearch & Consulting Services0.24%+0.01 ppAgricultural & Farm Machinery0.36%+0.01 ppTrading Companies & Distributors0.14%+0.01 ppElectrical Components & Equipment0.63%-0.01 ppData Processing & Outsourced Services0.07%-0.01 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.47%
Industry change · 12M
+0.02 pp
Human Resource & Employment Services · contribution
+0.015 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2021 · 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 |
|---|---|---|---|---|---|---|---|
| Automatic Data Processing → ADP | United States | $97.3bn | 0.329% | +0.033 pp | +0.012 pp | +35.4% | Yes |
| Paychex → PAYX | United States | $43.0bn | 0.145% | +0.007 pp | +0.003 pp | +31.2% | 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.