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
Semiconductors18.69%+6.47 ppTechnology Hardware, Storage & Peripherals9.29%+2.19 ppSystems Software6.70%-1.66 ppApplication Software2.34%-1.01 ppSemiconductor Materials & Equipment1.51%+0.94 ppCommunications Equipment1.58%+0.57 ppIT Consulting & Other Services0.76%-0.41 ppElectronic Components0.55%+0.33 ppElectronic Equipment & Instruments0.23%-0.06 ppInternet Services & Infrastructure0.10%-0.04 ppElectronic Manufacturing Services0.17%+0.03 ppTechnology Distributors0.03%-0.03 pp
3 · Sub-industry
Inside Electronic Components
Electronic Components · weight
0.55%
Industry change · 12M
+0.33 pp
Electronic Components · contribution
+0.332 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 2026 · 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 | $155.9bn | 0.270% | +0.093 pp | +0.174 pp | +269.3% | Yes |
| Coherent Corp. → COHR | United States | $70.7bn | 0.123% | +0.123 pp | +0.123 pp | +377.9% | Yes |
| Amphenol → APH | United States | $91.5bn | 0.159% | +0.035 pp | +0.035 pp | +66.6% | 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.