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 Software2.82%-1.45 ppSemiconductors1.92%-1.30 ppApplication Software1.80%-0.99 ppIT Consulting & Other Services0.95%-0.79 ppCommunications Equipment0.83%-0.48 ppTechnology Hardware, Storage & Peripherals1.26%-0.43 ppSemiconductor Materials & Equipment0.15%-0.20 ppElectronic Manufacturing Services0.10%-0.10 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
2.82%
Industry change · 12M
-1.45 pp
Systems Software · contribution
-1.448 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $861.4bn | 2.780% | -1.827 pp | -1.392 pp | +19.8% | No |
| Gen Digital → GEN | United States | $12.5bn | 0.040% | -0.038 pp | -0.056 pp | -25.2% | 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.