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 Software5.68%+1.16 ppApplication Software3.34%+0.37 ppTechnology Hardware, Storage & Peripherals1.85%-0.14 ppElectronic Equipment & Instruments0.30%+0.13 ppIT Consulting & Other Services1.62%-0.11 ppSemiconductor Materials & Equipment0.26%-0.09 ppCommunications Equipment1.56%+0.08 ppInternet Services & Infrastructure0.20%+0.06 ppSemiconductors3.36%+0.03 ppElectronic Manufacturing Services0.18%-0.02 ppElectronic Components0.16%+0.00 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.16%
Industry change · 12M
+0.00 pp
Electronic Components · contribution
+0.003 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2019 · 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 | $25.1bn | 0.140% | +0.052 pp | +0.002 pp | +20.7% | Yes |
| Amphenol → APH | United States | $3.7bn | 0.021% | +0.010 pp | +0.001 pp | +20.1% | 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.