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 Software2.84%-1.43 ppSemiconductors1.86%-1.36 ppApplication Software1.81%-0.98 ppIT Consulting & Other Services0.95%-0.79 ppCommunications Equipment0.82%-0.50 ppTechnology Hardware, Storage & Peripherals1.23%-0.46 ppSemiconductor Materials & Equipment0.13%-0.22 ppElectronic Manufacturing Services0.10%-0.11 ppElectronic Components0.10%-0.07 ppElectronic Equipment & Instruments0.10%-0.07 ppInternet Services & Infrastructure0.10%-0.03 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Communications Equipment
Communications Equipment · weight
0.82%
Industry change · 12M
-0.50 pp
Communications Equipment · contribution
-0.496 pp
Company participation
25%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 2018 · 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 | $222.4bn | 0.709% | -0.519 pp | -0.463 pp | +19.0% | No |
| Motorola Solutions → MSI | United States | $21.1bn | 0.067% | -0.047 pp | -0.025 pp | +32.6% | No |
| F5, Inc. → FFIV | United States | $12.1bn | 0.039% | -0.025 pp | -0.013 pp | +38.0% | No |
| Arista Networks → ANET | United States | $1.2bn | 0.004% | +0.004 pp | +0.004 pp | -3.6% | 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.