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
Technology Hardware, Storage & Peripherals5.52%+3.40 ppSystems Software4.28%-2.28 ppSemiconductors2.09%-1.28 ppApplication Software2.08%-1.17 ppIT Consulting & Other Services0.74%-0.74 ppCommunications Equipment0.55%-0.60 ppElectronic Equipment & Instruments0.24%-0.10 ppInternet Services & Infrastructure0.10%-0.10 ppElectronic Manufacturing Services0.10%-0.06 ppTechnology Distributors0.05%-0.05 ppElectronic Components0.08%-0.04 ppSemiconductor Materials & Equipment0.28%-0.01 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
4.28%
Industry change · 12M
-2.28 pp
Systems Software · contribution
-2.275 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2021 · 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 | $1749.5bn | 4.190% | -3.057 pp | -2.197 pp | +37.7% | Yes |
| Gen Digital → GEN | United States | $12.5bn | 0.030% | -0.028 pp | -0.057 pp | +31.4% | No |
| ServiceNow → NOW | United States | $21.2bn | 0.051% | -0.041 pp | -0.012 pp | +60.6% | No |
| Fortinet → FTNT | United States | $4.7bn | 0.011% | -0.006 pp | -0.008 pp | +25.5% | 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.