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
Technology Hardware, Storage & Peripherals5.52%+3.40 ppSystems Software4.28%-2.28 ppSemiconductors2.09%-1.28 ppApplication Software2.08%-1.17 ppIT Consulting & Other Services0.74%-0.74 ppCommunications Equipment0.55%-0.60 ppElectronic Equipment & Instruments0.24%-0.10 ppInternet Services & Infrastructure0.10%-0.10 ppElectronic Manufacturing Services0.10%-0.06 ppTechnology Distributors0.05%-0.05 ppElectronic Components0.08%-0.04 ppSemiconductor Materials & Equipment0.28%-0.01 pp
3 · Sub-industry
Inside Communications Equipment
Communications Equipment · weight
0.55%
Industry change · 12M
-0.60 pp
Communications Equipment · contribution
-0.602 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2021 · 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 | $188.4bn | 0.451% | -0.268 pp | -0.511 pp | +0.4% | No |
| Motorola Solutions → MSI | United States | $28.4bn | 0.068% | -0.059 pp | -0.082 pp | -3.7% | No |
| F5, Inc. → FFIV | United States | $12.1bn | 0.029% | -0.010 pp | -0.008 pp | +60.5% | Yes |
| Arista Networks → ANET | United States | $1.5bn | 0.003% | -0.001 pp | -0.002 pp | +37.7% | 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.