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 Technology41.9%+7.32 pp Energy2.5%+0.19 pp Consumer Discretionary11.8%-0.20 pp Materials2.0%-0.21 pp Communication Services2.4%-0.32 pp Real Estate2.0%-0.41 pp Utilities2.4%-0.43 pp Industrials9.6%-0.50 pp Health Care9.7%-1.47 pp Consumer Staples5.7%-1.52 pp Financials9.8%-2.46 pp

2 · Industry

Inside Information Technology

Semiconductors18.69%+6.47 pp Technology Hardware, Storage & Peripherals9.29%+2.19 pp Systems Software6.70%-1.66 pp Application Software2.34%-1.01 pp Semiconductor Materials & Equipment1.51%+0.94 pp Communications Equipment1.58%+0.57 pp IT Consulting & Other Services0.76%-0.41 pp Electronic Components0.55%+0.33 pp Electronic Equipment & Instruments0.23%-0.06 pp Internet Services & Infrastructure0.10%-0.04 pp Electronic Manufacturing Services0.17%+0.03 pp Technology Distributors0.03%-0.03 pp

3 · Sub-industry

Inside Semiconductor Materials & Equipment

Semiconductor Materials & Equipment1.51%+0.940 pp

Concentrated

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

View all contributions →

Semiconductor Materials & Equipment · weight

1.51%

Industry change · 12M

+0.94 pp

Semiconductor Materials & Equipment · contribution

+0.940 pp

Company participation

100%

of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

May 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	$397.9bn	0.690%	+0.289 pp	+0.455 pp	+296.7%	Yes
Applied Materials → AMAT	United States	$357.3bn	0.619%	+0.214 pp	+0.334 pp	+189.2%	Yes
Teradyne → TER	United States	$58.6bn	0.102%	+0.033 pp	+0.073 pp	+377.4%	Yes
Qnity Electronics → Q	United States	$32.7bn	0.057%	+0.020 pp	+0.057 pp	+0.0%	Yes
KLA Corporation → KLAC	United States	$25.1bn	0.044%	+0.016 pp	+0.021 pp	+155.5%	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.