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 Software8.22%+1.14 ppApplication Software3.70%+0.88 ppSemiconductors3.59%+0.52 ppTechnology Hardware, Storage & Peripherals9.23%+0.22 ppSemiconductor Materials & Equipment0.49%+0.13 ppCommunications Equipment0.96%+0.10 ppElectronic Equipment & Instruments0.36%-0.02 ppIT Consulting & Other Services1.28%+0.02 ppElectronic Manufacturing Services0.13%-0.01 ppTechnology Distributors0.09%+0.01 ppElectronic Components0.13%-0.01 ppInternet Services & Infrastructure0.12%+0.00 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.13%
Industry change · 12M
-0.01 pp
Electronic Components · contribution
-0.007 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 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 | $26.0bn | 0.087% | +0.018 pp | -0.010 pp | +8.6% | Yes |
| Amphenol → APH | United States | $12.5bn | 0.042% | +0.013 pp | +0.003 pp | +26.8% | 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.