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 Technology36.6%+3.08 pp Industrials10.0%+0.39 pp Communication Services2.7%+0.26 pp Materials2.4%+0.12 pp Energy2.5%+0.04 pp Utilities2.6%-0.06 pp Real Estate2.1%-0.26 pp Consumer Staples6.3%-0.46 pp Consumer Discretionary12.3%-0.81 pp Financials11.4%-1.15 pp Health Care11.0%-1.15 pp

2 · Industry

Inside Information Technology

Semiconductors15.34%+4.26 pp Application Software2.45%-1.03 pp Semiconductor Materials & Equipment1.19%+0.57 pp Systems Software6.78%-0.52 pp IT Consulting & Other Services0.97%-0.28 pp Communications Equipment1.09%+0.26 pp Technology Hardware, Storage & Peripherals7.94%-0.21 pp Electronic Components0.34%+0.14 pp Electronic Equipment & Instruments0.23%-0.08 pp Internet Services & Infrastructure0.10%-0.05 pp Electronic Manufacturing Services0.17%+0.04 pp Technology Distributors0.03%-0.03 pp

3 · Sub-industry

Inside Semiconductor Materials & Equipment

Semiconductor Materials & Equipment1.19%+0.572 pp

Concentrated

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

View all contributions →

Semiconductor Materials & Equipment · weight

1.19%

Industry change · 12M

+0.57 pp

Semiconductor Materials & Equipment · contribution

+0.572 pp

Company participation

100%

of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Jan 2026 · 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
Lam Research → LRCX	United States	$291.5bn	0.558%	+0.170 pp	+0.326 pp	+190.7%	Yes
Applied Materials → AMAT	United States	$255.6bn	0.489%	+0.125 pp	+0.163 pp	+80.5%	Yes
Qnity Electronics → Q	United States	$20.1bn	0.039%	+0.039 pp	+0.039 pp	+0.0%	Yes
Teradyne → TER	United States	$37.8bn	0.072%	+0.016 pp	+0.030 pp	+109.1%	Yes
KLA Corporation → KLAC	United States	$18.7bn	0.036%	+0.005 pp	+0.014 pp	+95.1%	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.