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
Semiconductors11.08%+7.06 ppSystems Software7.30%-1.93 ppTechnology Hardware, Storage & Peripherals8.15%-0.66 ppApplication Software3.47%-0.48 ppIT Consulting & Other Services1.26%-0.15 ppSemiconductor Materials & Equipment0.62%+0.12 ppElectronic Components0.19%+0.07 ppElectronic Equipment & Instruments0.30%-0.04 ppElectronic Manufacturing Services0.14%-0.04 ppTechnology Distributors0.06%-0.03 ppInternet Services & Infrastructure0.15%+0.03 ppCommunications Equipment0.83%-0.03 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.19%
Industry change · 12M
+0.07 pp
Electronic Components · contribution
+0.067 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2025 · 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 |
|---|---|---|---|---|---|---|---|
| Amphenol → APH | United States | $42.7bn | 0.095% | -0.000 pp | +0.050 pp | +41.2% | No |
| Corning Inc. → GLW | United States | $44.6bn | 0.099% | +0.003 pp | +0.017 pp | +65.0% | 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.