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 & Peripherals9.19%-0.77 ppSystems Software7.60%-0.34 ppIT Consulting & Other Services1.22%-0.14 ppSemiconductor Materials & Equipment0.45%-0.05 ppApplication Software3.32%+0.04 ppInternet Services & Infrastructure0.12%-0.03 ppElectronic Equipment & Instruments0.39%-0.03 ppCommunications Equipment0.97%-0.03 ppTechnology Distributors0.09%+0.01 ppSemiconductors3.62%-0.01 ppElectronic Manufacturing Services0.14%-0.00 ppElectronic Components0.14%+0.00 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
7.60%
Industry change · 12M
-0.34 pp
Systems Software · contribution
-0.342 pp
Company participation
75%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 2023 · 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 |
|---|---|---|---|---|---|---|---|
| Microsoft → MSFT | United States | $2146.1bn | 7.322% | +0.871 pp | -0.457 pp | -5.6% | Yes |
| Fortinet → FTNT | United States | $52.1bn | 0.178% | +0.040 pp | +0.141 pp | -2.8% | Yes |
| Gen Digital → GEN | United States | $11.0bn | 0.037% | -0.013 pp | -0.015 pp | -33.9% | No |
| ServiceNow → NOW | United States | $18.9bn | 0.064% | +0.008 pp | -0.011 pp | -16.6% | 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.