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 Software4.67%+0.41 ppTechnology Hardware, Storage & Peripherals2.07%+0.37 ppSemiconductors3.49%+0.27 ppApplication Software3.04%+0.25 ppCommunications Equipment1.41%+0.09 ppSemiconductor Materials & Equipment0.31%-0.04 ppInternet Services & Infrastructure0.16%+0.03 ppElectronic Components0.16%-0.02 ppElectronic Manufacturing Services0.19%-0.01 ppIT Consulting & Other Services1.73%-0.01 ppElectronic Equipment & Instruments0.17%+0.01 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
4.67%
Industry change · 12M
+0.41 pp
Systems Software · contribution
+0.406 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jun 2018 · 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 | $757.6bn | 4.597% | +0.285 pp | +0.424 pp | +4.7% | Yes |
| Gen Digital → GEN | United States | $12.8bn | 0.078% | -0.021 pp | -0.018 pp | -23.7% | 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.