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
Systems Software2.82%-1.45 ppSemiconductors1.92%-1.30 ppApplication Software1.80%-0.99 ppIT Consulting & Other Services0.95%-0.79 ppCommunications Equipment0.83%-0.48 ppTechnology Hardware, Storage & Peripherals1.26%-0.43 ppSemiconductor Materials & Equipment0.15%-0.20 ppElectronic Manufacturing Services0.10%-0.10 ppElectronic Components0.10%-0.08 ppElectronic Equipment & Instruments0.10%-0.06 ppInternet Services & Infrastructure0.10%-0.03 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.10%
Industry change · 12M
-0.08 pp
Electronic Components · contribution
-0.076 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 2018 · 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 | $27.1bn | 0.088% | -0.049 pp | -0.067 pp | +9.3% | No |
| Amphenol → APH | United States | $3.6bn | 0.011% | -0.008 pp | -0.009 pp | +2.4% | 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.