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
Semiconductors15.34%+4.26 ppApplication Software2.45%-1.03 ppSemiconductor Materials & Equipment1.19%+0.57 ppSystems Software6.78%-0.52 ppIT Consulting & Other Services0.97%-0.28 ppCommunications Equipment1.09%+0.26 ppTechnology Hardware, Storage & Peripherals7.94%-0.21 ppElectronic Components0.34%+0.14 ppElectronic Equipment & Instruments0.23%-0.08 ppInternet Services & Infrastructure0.10%-0.05 ppElectronic Manufacturing Services0.17%+0.04 ppTechnology Distributors0.03%-0.03 pp
3 · Sub-industry
Inside Communications Equipment
Communications Equipment · weight
1.09%
Industry change · 12M
+0.26 pp
Communications Equipment · contribution
+0.262 pp
Company participation
25%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 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 |
|---|---|---|---|---|---|---|---|
| Arista Networks → ANET | United States | $178.5bn | 0.341% | -0.047 pp | +0.261 pp | +23.0% | No |
| Cisco → CSCO | United States | $309.4bn | 0.592% | +0.026 pp | +0.055 pp | +32.4% | Yes |
| Motorola Solutions → MSI | United States | $67.0bn | 0.128% | -0.004 pp | -0.046 pp | -13.3% | No |
| F5, Inc. → FFIV | United States | $16.0bn | 0.031% | +0.002 pp | -0.008 pp | -7.3% | 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.