SK Hynix was last trading over 25% higher in Seoul on Friday, with Samsung Electronics rising more than 20%, as investors rushed back into semiconductor stocks after blockbuster earnings from Amazon and Microsoft revived the AI spending frenzy.
Who Gets Lifted, Who Gets Left Behind
The biggest winners were the chip heavyweights that sit closest to the machinery of corporate AI spending. SK Hynix was on course for its best day on record if gains held. Samsung Electronics climbed more than 20%. LG Innotek advanced 11.2%, and Seoul Semiconductor rose 7.8%. In Japan, the same speculative wave hit hard: Advantest climbed nearly 18%, Tokyo Electron gained almost 9%, Disco rose over 13%, Lasertec advanced more than 12% and Renesas Electronics added over 10%. SoftBank Group, which owns Arm and serves as a key artificial intelligence proxy, jumped more than 9%.
The rally came after a bruising sell-off earlier this week, when semiconductor stocks were battered by concerns over lofty AI valuations and signs of intensifying competition from Chinese memory chipmakers. The market had already shown how quickly the hype machine can turn on itself. Then the money came roaring back.
What the Big Tech Numbers Did
The iShares Semiconductor ETF (SOXX) surged more than 8% overnight as investors piled back into AI-linked chipmakers after stronger-than-expected cloud results from Amazon and Microsoft. Amazon jumped more than 9% in extended trading after reporting second-quarter revenue that beat analysts' expectations, driven by continued strength in its cloud-computing business. Microsoft had rallied 16% during Thursday's regular session after reporting faster-than-expected Azure cloud growth.
That cloud growth mattered because it reassured investors that AI infrastructure spending remains robust. In plain terms, the market heard that the bosses of cloud and chip capital still plan to keep feeding the machine. The result was a fresh burst of buying, and a sharp reversal from the week’s earlier panic.
Andrew Jackson, head of equity strategy at Ortus Advisors, said Microsoft's stronger-than-expected quarterly results "sparked a huge rebound for risk-on and AI," helping reverse the recent sell-off in technology stocks. He wrote in a note on Friday that investors were reassured after Azure cloud revenue beat expectations while management kept capital spending "in check," noting that a "'spend at all costs' mentality has been punished by the market."
Who Sets the Pace
That note lays out the logic of the whole arrangement. A handful of giant firms announce earnings. Traders and strategists read the numbers. Capital floods in or runs out. Workers, consumers and everyone else get the consequences after the fact.
The market’s mood swing also exposed how dependent these chip names have become on the fortunes of a few U.S. tech giants. Amazon and Microsoft did not just report earnings. They set off a chain reaction across Seoul and Tokyo, where chipmakers tied to the AI boom were rewarded for staying inside the approved spending script.
The phrase "in check" says plenty. Not growth for people. Not stability for communities. Just disciplined spending that keeps investors calm and the machine humming. When the numbers please the market, the stock prices soar. When they don’t, the sell-off comes first and the damage lands somewhere below the boardroom.
The whole episode shows how corporate power moves across borders with no vote, no consent, and no meaningful say from the people who live with the fallout. One day the sector is battered. The next day it’s celebrated. The bosses keep their control either way, and the market calls it confidence.