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 Software5.73%+2.89 ppSemiconductors3.19%+1.32 ppApplication Software3.11%+1.30 ppIT Consulting & Other Services1.55%+0.60 ppTechnology Hardware, Storage & Peripherals1.81%+0.58 ppCommunications Equipment1.31%+0.50 ppElectronic Equipment & Instruments0.29%+0.20 ppSemiconductor Materials & Equipment0.28%+0.14 ppInternet Services & Infrastructure0.20%+0.10 ppTechnology Distributors0.09%+0.09 ppElectronic Manufacturing Services0.17%+0.07 ppElectronic Components0.14%+0.03 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
5.73%
Industry change · 12M
+2.89 pp
Systems Software · contribution
+2.894 pp
Company participation
67%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 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 |
|---|---|---|---|---|---|---|---|
| Microsoft → MSFT | United States | $1061.5bn | 5.639% | +0.105 pp | +2.844 pp | +23.5% | Yes |
| Gen Digital → GEN | United States | $14.6bn | 0.078% | +0.005 pp | +0.035 pp | +12.6% | Yes |
| Fortinet → FTNT | United States | $2.6bn | 0.014% | -0.000 pp | +0.014 pp | -16.8% | 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.