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
Latest available · not live
20182026
Universe›Information Technology›Semiconductor Materials & Equipment›Semiconductor Materials & Equipment

1 · Sector

Weight and 12M allocation change

Information Technology43.1%+4.93 ppEnergy3.8%+1.55 ppHealth Care10.6%+0.26 ppMaterials1.9%-0.22 ppCommunication Services2.1%-0.27 ppReal Estate1.8%-0.35 ppIndustrials9.1%-0.58 ppUtilities2.1%-0.61 ppConsumer Staples5.4%-0.78 ppConsumer Discretionary10.3%-1.78 ppFinancials9.7%-2.16 pp

2 · Industry

Inside Information Technology

Semiconductors18.63%+3.92 ppApplication Software1.82%-1.73 ppTechnology Hardware, Storage & Peripherals9.60%+1.63 ppSemiconductor Materials & Equipment1.95%+1.21 ppCommunications Equipment1.54%+0.44 ppSystems Software7.87%-0.41 ppIT Consulting & Other Services0.61%-0.34 ppElectronic Components0.49%+0.20 ppElectronic Manufacturing Services0.22%+0.04 ppInternet Services & Infrastructure0.09%-0.02 ppTechnology Distributors0.03%-0.01 ppElectronic Equipment & Instruments0.24%-0.01 pp

3 · Sub-industry

Inside Semiconductor Materials & Equipment

Semiconductor Materials & Equipment1.95%+1.212 pp
Concentrated

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

View all contributions →
Semiconductor Materials & Equipment · weight
1.95%
Industry change · 12M
+1.21 pp
Semiconductor Materials & Equipment · contribution
+1.212 pp
Company participation
80%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Sep 2026 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
KLA Corporation →
KLAC
United States$254.7bn0.428%+0.359 pp+0.399 pp+81.7%Yes
Applied Materials →
AMAT
United States$405.8bn0.682%-0.316 pp+0.355 pp+151.2%Yes
Lam Research →
LRCX
United States$411.1bn0.691%-0.251 pp+0.351 pp+146.5%Yes
Teradyne →
TER
United States$62.7bn0.105%-0.026 pp+0.061 pp+191.8%Yes
Qnity Electronics →
Q
United States$26.3bn0.044%-0.015 pp+0.044 pp+0.0%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.