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 Information Technology
Technology Hardware, Storage & Peripherals8.16%-1.83 ppSystems Software6.57%-1.44 ppApplication Software3.04%-0.49 ppSemiconductors3.26%-0.45 ppIT Consulting & Other Services1.23%-0.16 ppSemiconductor Materials & Equipment0.42%-0.11 ppCommunications Equipment0.89%-0.08 ppElectronic Equipment & Instruments0.39%-0.03 ppElectronic Components0.14%-0.02 ppElectronic Manufacturing Services0.14%-0.02 ppInternet Services & Infrastructure0.13%-0.02 ppTechnology Distributors0.09%+0.00 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.14%
Industry change · 12M
-0.02 pp
Electronic Components · contribution
-0.020 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 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 |
|---|---|---|---|---|---|---|---|
| Corning Inc. → GLW | United States | $29.3bn | 0.100% | +0.004 pp | -0.020 pp | -15.1% | Yes |
| Amphenol → APH | United States | $11.9bn | 0.041% | +0.001 pp | +0.001 pp | +1.4% | 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.