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
Universe›Information Technology›Semiconductor Materials & Equipment›Semiconductor Materials & Equipment

1 · Sector

Weight and 12M allocation change

Information Technology39.6%+4.74 ppConsumer Discretionary12.3%+1.05 ppUtilities2.7%-0.15 ppFinancials11.2%-0.18 ppIndustrials9.5%-0.27 ppEnergy2.2%-0.34 ppCommunication Services2.1%-0.37 ppReal Estate2.1%-0.48 ppMaterials2.0%-0.52 ppConsumer Staples5.9%-1.08 ppHealth Care10.5%-2.40 pp

2 · Industry

Inside Information Technology

Semiconductors15.99%+3.85 ppSystems Software8.13%+0.62 ppCommunications Equipment1.12%+0.32 ppSemiconductor Materials & Equipment0.84%+0.20 ppIT Consulting & Other Services0.98%-0.16 ppElectronic Components0.32%+0.13 ppTechnology Hardware, Storage & Peripherals8.25%-0.11 ppElectronic Equipment & Instruments0.23%-0.06 ppElectronic Manufacturing Services0.19%+0.05 ppApplication Software3.37%-0.05 ppInternet Services & Infrastructure0.10%-0.03 ppTechnology Distributors0.04%-0.02 pp

3 · Sub-industry

Inside Semiconductor Materials & Equipment

Semiconductor Materials & Equipment0.84%+0.200 pp
Concentrated

Most of this industry's gains came from a few companies.

View all contributions →
Semiconductor Materials & Equipment · weight
0.84%
Industry change · 12M
+0.20 pp
Semiconductor Materials & Equipment · contribution
+0.200 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Oct 2025 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Lam Research →
LRCX
United States$197.8bn0.387%+0.132 pp+0.163 pp+114.0%Yes
Teradyne →
TER
United States$28.5bn0.056%+0.019 pp+0.015 pp+71.9%Yes
Applied Materials →
AMAT
United States$185.7bn0.364%+0.059 pp+0.012 pp+29.7%Yes
KLA Corporation →
KLAC
United States$15.9bn0.031%+0.007 pp+0.010 pp+83.2%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.