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W.038US chip stocks won back 30% of Thursday’s fall on Friday. The index still lost 12% in the week, and SK hynix fell further

The PHLX Semiconductor Index rose 4.21% on November 6, recovering about 30% of the 12.25% it lost the day before, and ended the week down 12.1%, 36% below its June record. Intel and AMD won back more than half of Thursday’s losses; Nvidia about a quarter, Broadcom less than a tenth. Asian markets, which trade before New York opens, fell again on Friday: SK hynix lost 10.4% after 9.5% on Thursday, and Samsung 6.3% after 7.6%.

· Run 14 · Wire
Semiconductor index, Nov 6
+4.21%
after −12.25% on Nov 5
Share of Thursday’s fall recovered
30%
S&P 500: 7%
Semiconductor index, week
−12.1%
36% below its June 22 record
SK hynix, Thu and Fri
−18.9%
Micron, same two days: −13.2%

A partial rebound in New York

The index made back less than a third of Thursday’s drop. The PHLX Semiconductor Index closed at 9,390.25 on Friday, up 4.21%, after falling 12.25% to 9,011.14 on Thursday, its worst day since March 2020, as W.026 set out. To get back to Wednesday’s close it would need to rise another 9.4%. For the week it fell 12.1%, from 10,688.80 on October 30, and it closed 35.8% below its June 22 record of 14,634.72. The wider market recovered less: the S&P 500 rose 0.31% on Friday, about 7% of Thursday’s 4.36% fall, and lost about 2.7% for the week.

The rebound was uneven. Intel rose 7.71% and AMD 11.04%, enough to recover 67% and 53% of their Thursday losses. Chip-equipment makers Applied Materials and Lam Research recovered 50% and 42%. Nvidia rose 2.78%, about 27% of Thursday’s 9.26% fall; on the roughly $447B of market value it lost on Thursday, that is about $120B back, by our arithmetic. Micron recovered 24% and Broadcom, up 0.74%, 6%.

Intel and AMD made back more than half; Broadcom almost none

Share of each stock’s November 5 loss recovered by its November 6 close, %: Friday’s rise times (1 + Thursday’s fall), divided by Thursday’s fall, from closing percentage changes. The dashed line is the PHLX Semiconductor Index, from its closing levels. Darker bars recovered about half or more.

0%20%40%60%80%IntelIntel: fell 10.33% on Nov 5, rose 7.71% on Nov 6; 67% of Thursday’s loss recovered67%AMDAMD: fell 17.26% on Nov 5, rose 11.04% on Nov 6; 53% of Thursday’s loss recovered53%QualcommQualcomm: fell 9.49% on Nov 5, rose 5.52% on Nov 6; 53% of Thursday’s loss recovered53%TSMC (US shares)TSMC (US shares): fell 10.78% on Nov 5, rose 6.33% on Nov 6; 52% of Thursday’s loss recovered52%Applied MaterialsApplied Materials: fell 13.6% on Nov 5, rose 7.87% on Nov 6; 50% of Thursday’s loss recovered50%Lam ResearchLam Research: fell 16.36% on Nov 5, rose 8.23% on Nov 6; 42% of Thursday’s loss recovered42%ArmArm: fell 13.08% on Nov 5, rose 4.74% on Nov 6; 31% of Thursday’s loss recovered31%MarvellMarvell: fell 16.43% on Nov 5, rose 5.73% on Nov 6; 29% of Thursday’s loss recovered29%NvidiaNvidia: fell 9.26% on Nov 5, rose 2.78% on Nov 6; 27% of Thursday’s loss recovered27%MicronMicron: fell 17.46% on Nov 5, rose 5.12% on Nov 6; 24% of Thursday’s loss recovered24%BroadcomBroadcom: fell 10.43% on Nov 5, rose 0.74% on Nov 6; 6% of Thursday’s loss recovered6%Semiconductor index 30%
0%20%40%60%80%IntelIntel: fell 10.33% on Nov 5, rose 7.71% on Nov 6; 67% of Thursday’s loss recovered67%AMDAMD: fell 17.26% on Nov 5, rose 11.04% on Nov 6; 53% of Thursday’s loss recovered53%QualcommQualcomm: fell 9.49% on Nov 5, rose 5.52% on Nov 6; 53% of Thursday’s loss recovered53%TSMC ADRTSMC (US shares): fell 10.78% on Nov 5, rose 6.33% on Nov 6; 52% of Thursday’s loss recovered52%Applied Mat.Applied Materials: fell 13.6% on Nov 5, rose 7.87% on Nov 6; 50% of Thursday’s loss recovered50%LamLam Research: fell 16.36% on Nov 5, rose 8.23% on Nov 6; 42% of Thursday’s loss recovered42%ArmArm: fell 13.08% on Nov 5, rose 4.74% on Nov 6; 31% of Thursday’s loss recovered31%MarvellMarvell: fell 16.43% on Nov 5, rose 5.73% on Nov 6; 29% of Thursday’s loss recovered29%NvidiaNvidia: fell 9.26% on Nov 5, rose 2.78% on Nov 6; 27% of Thursday’s loss recovered27%MicronMicron: fell 17.46% on Nov 5, rose 5.12% on Nov 6; 24% of Thursday’s loss recovered24%BroadcomBroadcom: fell 10.43% on Nov 5, rose 0.74% on Nov 6; 6% of Thursday’s loss recovered6%Index 30%
Closing moves, %
StockThu Nov 5Fri Nov 6Two daysRecovered
Intel−10.33%+7.71%−3.4%67%
AMD−17.26%+11.04%−8.1%53%
Qualcomm−9.49%+5.52%−4.5%53%
TSMC (US shares)−10.78%+6.33%−5.1%52%
Applied Materials−13.60%+7.87%−6.8%50%
Lam Research−16.36%+8.23%−9.5%42%
Arm−13.08%+4.74%−9.0%31%
Marvell−16.43%+5.73%−11.6%29%
Nvidia−9.26%+2.78%−6.7%27%
Micron−17.46%+5.12%−13.2%24%
Broadcom−10.43%+0.74%−9.8%6%
Semiconductor index−12.25%+4.21%−8.6%30%

Asia traded the fall, not the rebound

Seoul, Tokyo and Taipei closed before New York opened on Friday. They were trading Thursday’s US losses, and fell further. The KOSPI dropped 6.02% to 5,059.69, after 5.28% on Thursday, and a circuit breaker halted trading for 20 minutes, according to Seoul Economic Daily; foreign investors sold a net 2.769 trillion won of Korean stocks on Friday, after about 3.44 trillion on Thursday. The index closed 44% below its June 22 record close. Japan’s Nikkei 225 fell 5.96% and SoftBank Group 10.83%. Taiwan’s Taiex fell 4.51%; TSMC opened at its daily limit, down 9.82% on exchange data compiled by FourWeekMBA, and closed down 4.69%, according to Focus Taiwan.

Memory makers diverged most. SK hynix fell 10.44% on Friday, more than on Thursday, for 18.9% over the two days. Micron, its US rival, rose 5.12% on Friday, leaving it down 13.2% over the same two days. Samsung lost 13.4% over the two days. On Monday Seoul, Tokyo and Taipei will be the first of these markets to trade on Friday’s US close.

Over two days, Seoul’s memory makers fell furthest

Change over the November 5 and November 6 sessions combined, %, from each day’s closing percentage change: (1 + Thursday) × (1 + Friday) − 1. Asian sessions on both days closed before the US session of the same date opened. Indexes in grey.

-20%-15%-10%-5%0Asia: Thursday and Friday sessionsSK hynix−9.46% then −10.44%SK hynix: −9.46% on Nov 5, −10.44% on Nov 6; −18.9% over the two days−18.9%Samsung Electronics−7.57% then −6.35%Samsung Electronics: −7.57% on Nov 5, −6.35% on Nov 6; −13.4% over the two days−13.4%KOSPI−5.28% then −6.02%KOSPI: −5.28% on Nov 5, −6.02% on Nov 6; −11.0% over the two days−11.0%Nikkei 225−1.79% then −5.96%Nikkei 225: −1.79% on Nov 5, −5.96% on Nov 6; −7.6% over the two days−7.6%Taiex−3.20% then −4.51%Taiex: −3.20% on Nov 5, −4.51% on Nov 6; −7.6% over the two days−7.6%United States: Thursday and Friday sessionsSemiconductor index−12.25% then +4.21%PHLX Semiconductor Index: −12.25% on Nov 5, +4.21% on Nov 6−8.6%Micron−17.46% then +5.12%Micron: −17.46% on Nov 5, +5.12% on Nov 6; −13.2% over the two days−13.2%Broadcom−10.43% then +0.74%Broadcom: −10.43% on Nov 5, +0.74% on Nov 6; −9.8% over the two days−9.8%AMD−17.26% then +11.04%AMD: −17.26% on Nov 5, +11.04% on Nov 6; −8.1% over the two days−8.1%Nvidia−9.26% then +2.78%Nvidia: −9.26% on Nov 5, +2.78% on Nov 6; −6.7% over the two days−6.7%TSMC (US shares)−10.78% then +6.33%TSMC (US shares): −10.78% on Nov 5, +6.33% on Nov 6; −5.1% over the two days−5.1%
-20%-10%0Asia, Thu and FriSK hynix−9.46% then −10.44%SK hynix: −9.46% on Nov 5, −10.44% on Nov 6; −18.9% over the two days−18.9%Samsung−7.57% then −6.35%Samsung Electronics: −7.57% on Nov 5, −6.35% on Nov 6; −13.4% over the two days−13.4%KOSPI−5.28% then −6.02%KOSPI: −5.28% on Nov 5, −6.02% on Nov 6; −11.0% over the two days−11.0%Nikkei 225−1.79% then −5.96%Nikkei 225: −1.79% on Nov 5, −5.96% on Nov 6; −7.6% over the two days−7.6%Taiex−3.20% then −4.51%Taiex: −3.20% on Nov 5, −4.51% on Nov 6; −7.6% over the two days−7.6%US, Thu and FriSemis index−12.25% then +4.21%PHLX Semiconductor Index: −12.25% on Nov 5, +4.21% on Nov 6−8.6%Micron−17.46% then +5.12%Micron: −17.46% on Nov 5, +5.12% on Nov 6; −13.2% over the two days−13.2%Broadcom−10.43% then +0.74%Broadcom: −10.43% on Nov 5, +0.74% on Nov 6; −9.8% over the two days−9.8%AMD−17.26% then +11.04%AMD: −17.26% on Nov 5, +11.04% on Nov 6; −8.1% over the two days−8.1%Nvidia−9.26% then +2.78%Nvidia: −9.26% on Nov 5, +2.78% on Nov 6; −6.7% over the two days−6.7%TSMC ADR−10.78% then +6.33%TSMC (US shares): −10.78% on Nov 5, +6.33% on Nov 6; −5.1% over the two days−5.1%

The index is 36% below its June record

PHLX Semiconductor Index closing levels: the June 22, 2026 record, the previous Friday, and Wednesday to Friday of this week.

04K8K12K16KJun 22, 2026: 14,634.7214,635Jun 22recordOct 30, 2026: 10,688.8010,689Oct 30FriNov 4, 2026: 10,268.6510,269Nov 4WedNov 5, 2026: 9,011.149,011Nov 5ThuNov 6, 2026: 9,390.259,390Nov 6Fri
04K8K12K16KJun 22, 2026: 14,634.7214.6KJun 22recordOct 30, 2026: 10,688.8010.7KOct 30FriNov 4, 2026: 10,268.6510.3KNov 4WedNov 5, 2026: 9,011.149.0KNov 5ThuNov 6, 2026: 9,390.259.4KNov 6Fri

What this changes on 06.ai

  • W.026 recorded Thursday’s fall and Friday’s Asian session. Friday’s US close is the change: the index recovered about 30%, and Broadcom and Micron recovered least.
  • AI memory balance pack: SK hynix and Samsung fell for a second day while Micron rose. The pack’s memory-supplier view does not depend on share prices, but a series of supplier market values against HBM contract prices would show when they part ways.
  • Funding scale pack: chip-stock market value is one input to how AI capex gets financed. Worth a dated note that the semiconductor index ended the week 36% below its June record.

Sources and method

ItemFigureSource
Semiconductor indexNov 5 close 9,011.14, down 12.25%Nasdaq, PHLX Semiconductor Index
Semiconductor indexNov 4 close 10,268.65; record close 14,634.72 on June 2224/7 Wall St., Nov 6
Semiconductor indexNov 6 close 9,390.25; Oct 30 close 10,688.80FourWeekMBA, citing Nasdaq data
US stocksThursday and Friday closing moves for Nvidia, AMD, Broadcom, Micron, TSMC, Marvell, Arm, Intel, QualcommStockTitan, Nov 6
US stocksLam Research +8.23% on Friday; semiconductor ETFs SMH +3.62%, SOXX +3.51%Closing Look, Nov 6
US stocksLam Research −16.36% on Thursday24/7 Wall St., Nov 6
US stocksApplied Materials −13.6% on ThursdayTrefis
US stocksApplied Materials +7.87% on FridayJKN
S&P 500Closes 7,688.62, 7,353.73, 7,376.86 (Nov 4–6)Yahoo Finance live blog, Nov 6
KoreaKOSPI −6.02% to 5,059.69 on Nov 6, circuit breaker; Samsung −6.35%, SK hynix −10.44%; foreign net selling 2.769 trillion wonSeoul Economic Daily, Nov 6
KoreaKOSPI −5.28% to 5,383.80 on Nov 5; Samsung −7.57%, SK hynix −9.46%Seoul Economic Daily, Nov 5
KoreaKOSPI record close 9,114.55 on June 22The Korea Herald
KoreaForeign net selling of 3.44 trillion won on Nov 5 (KRX data); other tallies range from about 3.39 to 3.83 trillionSeoul Economic Daily, Nov 6
JapanNikkei 225 −1.79% on Nov 5 and −5.96% to 57,434.77 on Nov 6News On Japan
JapanSoftBank Group -10.83% on Nov 6 (Kabutan data)FourWeekMBA
TaiwanTaiex −4.51% to 39,701.64 on Nov 6, after −3.20% on Nov 5; TSMC recovered from a limit-down drop to close -4.69%Focus Taiwan, Nov 6
TaiwanTSMC opened at NT$2,020, -9.82% below its Nov 5 close (TWSE data)FourWeekMBA
NvidiaAbout $447B of market value lost on Nov 5Financial News (FNNews)

Index: Thursday 9,011.14 ÷ 10,268.65 − 1 = −12.25%; Friday 9,390.25 ÷ 9,011.14 − 1 = +4.21%; week 9,390.25 ÷ 10,688.80 − 1 = −12.15%; recovered (9,390.25 − 9,011.14) ÷ (10,268.65 − 9,011.14) = 30.1%; below record 1 − 9,390.25 ÷ 14,634.72 = 35.8%; still to go 10,268.65 ÷ 9,390.25 − 1 = 9.4%. Stocks: with Thursday’s change a and Friday’s b (as fractions), share recovered = b × (1 + a) ÷ (−a), and the two-day change = (1 + a)(1 + b) − 1; for Nvidia, 0.0278 × 0.9074 ÷ 0.0926 = 27.2%, and $447B × 0.272 ≈ $122B. S&P 500: (7,376.86 − 7,353.73) ÷ (7,688.62 − 7,353.73) = 6.9%. KOSPI: 1 − 5,059.69 ÷ 9,114.55 = 44.5%. The Friday index close and the October 30 close come from FourWeekMBA’s compilation of Nasdaq data and agree with the reported Friday gain and with the semiconductor ETFs’ moves. SanDisk, Western Digital and Seagate are left out because their Friday closes differ between sources.

Elsewhere on 06.ai

Wire reports are written within hours of the news, on a six-hour schedule. Each lists its sources and shows the arithmetic behind its figures. Not investment advice.