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 Communications Equipment
Communications Equipment · weight
1.30%
Industry change · 12M
+0.47 pp
Communications Equipment · contribution
+0.467 pp
Company participation
25%
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 |
|---|---|---|---|---|---|---|---|
| Cisco → CSCO | United States | $200.4bn | 1.090% | -0.207 pp | +0.365 pp | +0.7% | No |
| Motorola Solutions → MSI | United States | $30.0bn | 0.163% | +0.019 pp | +0.096 pp | +43.2% | Yes |
| F5, Inc. → FFIV | United States | $7.7bn | 0.042% | -0.004 pp | +0.005 pp | -31.9% | No |
| Arista Networks → ANET | United States | $1.1bn | 0.006% | -0.001 pp | +0.001 pp | -24.2% | 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.