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 Software5.82%+3.00 ppApplication Software3.24%+1.44 ppSemiconductors3.16%+1.24 ppIT Consulting & Other Services1.56%+0.61 ppTechnology Hardware, Storage & Peripherals1.73%+0.47 ppCommunications Equipment1.30%+0.47 ppElectronic Equipment & Instruments0.31%+0.21 ppSemiconductor Materials & Equipment0.27%+0.12 ppInternet Services & Infrastructure0.21%+0.11 ppElectronic Manufacturing Services0.17%+0.06 ppElectronic Components0.14%+0.04 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.14%
Industry change · 12M
+0.04 pp
Electronic Components · contribution
+0.037 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $21.7bn | 0.118% | -0.014 pp | +0.031 pp | -14.7% | No |
| Amphenol → APH | United States | $3.3bn | 0.018% | -0.001 pp | +0.006 pp | -6.5% | 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.