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 Software5.30%+0.89 ppApplication Software3.29%+0.39 ppSemiconductors3.21%-0.25 ppTechnology Hardware, Storage & Peripherals1.82%-0.21 ppSemiconductor Materials & Equipment0.24%-0.15 ppIT Consulting & Other Services1.65%-0.13 ppCommunications Equipment1.56%+0.13 ppElectronic Equipment & Instruments0.30%+0.12 ppElectronic Manufacturing Services0.16%-0.06 ppInternet Services & Infrastructure0.19%+0.05 ppElectronic Components0.17%+0.00 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
5.30%
Industry change · 12M
+0.89 pp
Systems Software · contribution
+0.889 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 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 | $904.9bn | 5.198% | +2.411 pp | +0.887 pp | +31.4% | Yes |
| Fortinet → FTNT | United States | $2.9bn | 0.016% | +0.008 pp | +0.016 pp | +56.7% | Yes |
| Gen Digital → GEN | United States | $14.7bn | 0.084% | +0.041 pp | -0.014 pp | -9.8% | 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.