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 & Defense2.33%-1.90 ppIndustrial Conglomerates0.87%-0.22 ppRail Transportation1.02%+0.14 ppIndustrial Machinery & Supplies & Components1.03%-0.14 ppAir Freight & Logistics0.72%-0.14 ppBuilding Products0.48%-0.09 ppConstruction Machinery & Heavy Transportation Equipment0.63%-0.08 ppHuman Resource & Employment Services0.49%+0.08 ppEnvironmental & Facilities Services0.46%+0.06 ppPassenger Airlines0.26%-0.05 ppHeavy Electrical Equipment0.05%-0.02 ppCargo Ground Transportation0.12%+0.02 ppConstruction & Engineering0.11%+0.01 ppElectrical Components & Equipment0.61%-0.01 ppData Processing & Outsourced Services0.06%-0.01 ppResearch & Consulting Services0.21%-0.00 ppAgricultural & Farm Machinery0.42%-0.00 ppDiversified Support Services0.11%+0.00 ppTrading Companies & Distributors0.14%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.49%
Industry change · 12M
+0.08 pp
Human Resource & Employment Services · contribution
+0.079 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2022 · 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 | $91.1bn | 0.330% | +0.038 pp | +0.041 pp | +18.9% | Yes |
| Paychex → PAYX | United States | $45.8bn | 0.165% | +0.023 pp | +0.038 pp | +33.1% | 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.