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 Technology38.2%+3.54 ppFinancials11.8%+0.88 ppConsumer Discretionary12.1%+0.80 ppIndustrials9.7%-0.00 ppCommunication Services2.4%-0.05 ppUtilities2.7%-0.15 ppEnergy2.3%-0.17 ppMaterials2.1%-0.43 ppReal Estate2.2%-0.45 ppConsumer Staples6.2%-0.90 ppHealth Care10.4%-3.06 pp

2 · Industry

Inside Information Technology

Semiconductors14.71%+3.11 ppTechnology Hardware, Storage & Peripherals7.97%-0.58 ppSystems Software8.28%+0.44 ppCommunications Equipment1.10%+0.33 ppSemiconductor Materials & Equipment0.74%+0.25 ppIT Consulting & Other Services0.95%-0.23 ppApplication Software3.55%+0.16 ppElectronic Components0.29%+0.11 ppElectronic Equipment & Instruments0.25%-0.04 ppElectronic Manufacturing Services0.18%+0.04 ppTechnology Distributors0.04%-0.03 ppInternet Services & Infrastructure0.11%-0.02 pp

3 · Sub-industry

Inside Semiconductor Materials & Equipment

Semiconductor Materials & Equipment0.74%+0.251 pp
Concentrated

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

View all contributions →
Semiconductor Materials & Equipment · weight
0.74%
Industry change · 12M
+0.25 pp
Semiconductor Materials & Equipment · contribution
+0.251 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Lam Research →
LRCX
United States$169.5bn0.339%+0.071 pp+0.315 pp+65.8%Yes
Applied Materials →
AMAT
United States$163.1bn0.327%+0.010 pp-0.061 pp+2.4%Yes
Teradyne →
TER
United States$21.9bn0.044%+0.013 pp-0.007 pp+3.3%Yes
KLA Corporation →
KLAC
United States$14.2bn0.028%+0.003 pp+0.004 pp+40.6%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.