SMH · WMTMT

Oct 5Oct 6Oct 7Oct 8Oct 9

30-minute bars · index reconstructed live from member prices

Breadth

21 / 25

stocks fell with the index

Concentration

35%

of the decline from SKHY, INTC, NVDA

Biggest driver

SKHY −3.57

class="svelte-77tdkt">13, −13.38%

Biggest offset

AVGO +0.46

class="svelte-77tdkt">4, +1.80%

What drove it

25 members · detractors first · 1W · residual 5.4bp within 60bp gate

The SMH fell 4.32% (−27.27 pts) on the week in a broad selloff: 21 of 25 stocks fell, with SKHY out front at −3.57 points.

Read the latest market-close note: Goldman and Microsoft Push the Dow to a Large Gain While Telecoms Sink Communication Services

+1.1 pts from 4 gainers−28.3 pts from 21 losers

net −27.3 pts · losers outweigh gainers 26.9 to 1

Stock

Points

Return

SMHsum of all 25 stocks

−27.3

−4.32%

SKHYclass="svelte-77tdkt">13

−3.6

−13.38%

INTCclass="svelte-77tdkt">10

−3.5

−12.26%

NVDAclass="svelte-77tdkt">1

−2.5

−2.00%

TSMclass="svelte-77tdkt">2

−2.5

−4.13%

LRCXclass="svelte-77tdkt">12

−2.2

−8.24%

AMATclass="svelte-77tdkt">7

−1.7

−6.11%

AMDclass="svelte-77tdkt">3

−1.6

−4.07%

KLACclass="svelte-77tdkt">9

−1.4

−5.47%

ASMLclass="svelte-77tdkt">11

−1.2

−4.66%

QCOMclass="svelte-77tdkt">15

−1.1

−5.07%

MUclass="svelte-77tdkt">5

−1.1

−4.27%

TXNclass="svelte-77tdkt">8

−1.1

−3.42%

ARMclass="svelte-77tdkt">21

−1.0

−13.40%

TERclass="svelte-77tdkt">18

−0.9

−11.21%

ADIclass="svelte-77tdkt">14

−0.7

−2.63%

STMclass="svelte-77tdkt">23

−0.6

−9.08%

NXPIclass="svelte-77tdkt">22

−0.4

−6.62%

MCHPclass="svelte-77tdkt">24

−0.4

−7.10%

ONclass="svelte-77tdkt">25

−0.3

−8.67%

MPWRclass="svelte-77tdkt">19

−0.3

−3.71%

ALABclass="svelte-77tdkt">20

−0.2

−2.32%

CDNSclass="svelte-77tdkt">16

+0.0

+0.42%

MRVLclass="svelte-77tdkt">6

+0.1

+1.10%

SNPSclass="svelte-77tdkt">17

+0.4

+4.10%

AVGOclass="svelte-77tdkt">4

+0.5

+1.80%

Cap weighting, illustrated

class="svelte-77tdkt">1 and class="svelte-77tdkt">20 moved almost identically (−2.00% vs −2.32%), yet NVDA moved the SMH 9.9× as much. In a cap-weighted index, the bigger company's weight turns the same percentage move into far more points.

Attribution map

slicing the −27.27 pt move · cell size = points contributed · color = direction, intensity = return

SKHY−3.6 pts(−13.4%)

INTC−3.5 pts(−12.3%)

NVDA−2.5 pts(−2.0%)

TSM−2.5 pts(−4.1%)

LRCX−2.2 pts(−8.2%)

AMAT−1.7 pts(−6.1%)

AMD−1.6 pts(−4.1%)

KLAC−1.4 pts

ASML−1.2 pts(−4.7%)

QCOM−1.1 pts(−5.1%)

MU−1.1 pts

TXN−1.1 pts

ARM−1.0 pts

TER−0.9 pts(−11.2%)

ADI−0.7 pts(−2.6%)

STM−0.6 pts(−9.1%)

AVGO+0.5 pts

SNPS+0.4 pts

NXPI−0.4 pts

MCHP−0.4 pts

ALAB

MRVL

Concentration curve

cumulative share of the −27.27 pt move · sorted by contribution

When they drove it

cumulative points through the period

Breadth

member returns, this period

−15%−10%−5%0%

From −13.40% (ARM) to +4.10% (SNPS). Equal-weight, the SMH would be −5.24% vs the actual −4.32%; the gap is what cap weighting did.

By sector

point contribution · sums to −27.27 pts

Unknown25

−27.3

The year, session by session

every trading day of 2026 · hover for the move

JANFEBMARAPRMAYJUNJULAUGSEPOCT

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What drove it

Attribution map

Concentration curve

When they drove it

Breadth

By sector

The year, session by session

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