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
Construction Machinery & Heavy Transportation Equipment0.75%+0.17 ppRail Transportation0.85%-0.17 ppIndustrial Conglomerates0.77%-0.10 ppAir Freight & Logistics0.70%-0.09 ppIndustrial Machinery & Supplies & Components1.16%+0.07 ppAgricultural & Farm Machinery0.44%+0.05 ppHeavy Electrical Equipment0.03%-0.04 ppDiversified Support Services0.14%+0.04 ppTrading Companies & Distributors0.17%+0.03 ppAerospace & Defense2.51%+0.03 ppElectrical Components & Equipment0.64%+0.03 ppConstruction & Engineering0.13%+0.03 ppEnvironmental & Facilities Services0.42%+0.02 ppHuman Resource & Employment Services0.46%+0.01 ppPassenger Airlines0.22%-0.01 ppResearch & Consulting Services0.18%-0.01 ppBuilding Products0.53%+0.01 ppCargo Ground Transportation0.13%-0.00 ppData Processing & Outsourced Services0.06%-0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.46%
Industry change · 12M
+0.01 pp
Human Resource & Employment Services · contribution
+0.013 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 2023 · 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 | 0.320% | -0.052 pp | +0.022 pp | +9.6% | No |
| Paychex → PAYX | United States | $39.8bn | 0.140% | -0.012 pp | -0.009 pp | -4.8% | 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.