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 Software8.56%+1.53 ppTechnology Hardware, Storage & Peripherals9.55%+0.61 ppSemiconductors4.03%+0.58 ppApplication Software4.20%+0.53 ppSemiconductor Materials & Equipment0.59%+0.14 ppCommunications Equipment0.98%+0.04 ppElectronic Equipment & Instruments0.46%+0.03 ppInternet Services & Infrastructure0.15%-0.02 ppElectronic Manufacturing Services0.17%+0.01 ppTechnology Distributors0.09%+0.01 ppIT Consulting & Other Services1.35%-0.01 ppElectronic Components0.15%+0.01 pp
3 · Sub-industry
Inside Systems Software
Systems Software · weight
8.56%
Industry change · 12M
+1.53 pp
Systems Software · contribution
+1.533 pp
Company participation
75%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 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 | $2482.1bn | 8.386% | +0.800 pp | +1.512 pp | +55.7% | Yes |
| Fortinet → FTNT | United States | $10.9bn | 0.037% | +0.002 pp | +0.020 pp | +169.5% | Yes |
| Gen Digital → GEN | United States | $14.5bn | 0.049% | -0.003 pp | +0.003 pp | +39.1% | No |
| ServiceNow → NOW | United States | $25.8bn | 0.087% | +0.002 pp | -0.001 pp | +21.2% | 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.