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
Semiconductors1.78%-1.44 ppSystems Software2.83%-1.44 ppApplication Software1.75%-1.03 ppIT Consulting & Other Services0.86%-0.88 ppCommunications Equipment0.82%-0.50 ppTechnology Hardware, Storage & Peripherals1.24%-0.45 ppSemiconductor Materials & Equipment0.12%-0.23 ppElectronic Manufacturing Services0.09%-0.12 ppElectronic Components0.10%-0.08 ppElectronic Equipment & Instruments0.10%-0.06 ppInternet Services & Infrastructure0.10%-0.03 ppTechnology Distributors0.00%+0.00 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
2.83%
Industry change · 12M
-1.44 pp
Systems Software · contribution
-1.441 pp
Company participation
33%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 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 | $819.9bn | 2.779% | -1.975 pp | -1.393 pp | +13.9% | No |
| Gen Digital → GEN | United States | $11.6bn | 0.039% | -0.034 pp | -0.057 pp | -32.7% | No |
| Fortinet → FTNT | United States | $2.8bn | 0.009% | +0.009 pp | +0.009 pp | +78.5% | 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.