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 & Peripherals8.57%+8.57 ppSystems Software7.61%+7.60 ppApplication Software3.96%+3.96 ppSemiconductors3.51%+3.51 ppIT Consulting & Other Services1.36%+1.36 ppCommunications Equipment0.99%+0.99 ppSemiconductor Materials & Equipment0.52%+0.52 ppElectronic Equipment & Instruments0.44%+0.44 ppElectronic Manufacturing Services0.16%+0.16 ppElectronic Components0.15%+0.15 ppInternet Services & Infrastructure0.14%+0.14 ppTechnology Distributors0.09%+0.09 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
7.61%
Industry change · 12M
+7.60 pp
Systems Software · contribution
+7.602 pp
Company participation
75%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 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 |
|---|---|---|---|---|---|---|---|
| Microsoft → MSFT | United States | $2118.6bn | 7.438% | +0.235 pp | +7.430 pp | +35.3% | Yes |
| ServiceNow → NOW | United States | $24.7bn | 0.087% | +0.010 pp | +0.086 pp | +28.3% | Yes |
| Gen Digital → GEN | United States | $14.7bn | 0.052% | -0.004 pp | +0.052 pp | +24.1% | No |
| Fortinet → FTNT | United States | $9.5bn | 0.033% | +0.006 pp | +0.033 pp | +147.9% | 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.