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
Semiconductors3.41%+0.19 ppTechnology Hardware, Storage & Peripherals1.86%+0.17 ppSystems Software4.42%+0.16 ppApplication Software2.93%+0.14 ppCommunications Equipment1.45%+0.14 ppIT Consulting & Other Services1.79%+0.04 ppSemiconductor Materials & Equipment0.39%+0.04 ppElectronic Manufacturing Services0.22%+0.01 ppInternet Services & Infrastructure0.14%+0.01 ppElectronic Equipment & Instruments0.17%+0.01 ppElectronic Components0.17%-0.00 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
4.42%
Industry change · 12M
+0.16 pp
Systems Software · contribution
+0.156 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 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 | $722.0bn | 4.327% | +0.154 pp | +0.154 pp | -0.8% | Yes |
| Gen Digital → GEN | United States | $16.3bn | 0.098% | +0.002 pp | +0.002 pp | -3.2% | 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.