Why South Korea’s KOSPI fell far harder than semiconductor profits justified



Analysis Why South Korea’s KOSPI fell far harder than semiconductor profits justified Record margin borrowing and concentrated retail ownership magnified an otherwise conventional market correction Jesse JamesJuly 29, 2026 SHARE COPY LINK FACEBOOK X LINKEDIN MASTODON A semiconductor chip (Sept. 1, 2022) against a backdrop of stock market charts (April 25, 2025) \| Image: Unsplash, Unsplash, edited by Korea Pro The KOSPI’s retreat exposed how record retail borrowing and extreme concentration in two semiconductor companies could turn a change in market expectations into a forced-selling cycle. The index closed 2025 at 4,214.17 and more than doubled over the next six months, reaching a record close of 9,114.55 on June 22. It then fell to 5,647.65 by Wednesday morning. Near the peak, Samsung Electronics and SK Hynix represented almost 55% of the KOSPI’s total market value, while outstanding margin loans reached a record $26.7 billion (38.63 trillion won) two trading sessions after the index topped. The rally rested on © Korea Risk Group. All rights reserved. No part of this content may be reproduced, distributed, or used for commercial purposes without prior written permission from Korea Risk Group. LATEST ANALYSIS 01Why South Korea cannot rebalance growth without stronger regional clusters 02Samsung, SK Hynix rejection exposes South Korea’s chip-grid financing problem 03Trump’s Cheongung social media post tests Seoul’s refusal to arm to Ukraine 04Lee Jae Myung risks public trust as South Korea rewires its justice system 05South Korea turns to Central Asia as Iran war tests its energy resilience 06Houthi seizure of Mokha sharpens South Korea’s Hormuz deployment dilemma 07Japan’s stronger yen may cut Korea’s import bill while raising funding costs 08South Korea leans on Europe as Hormuz deployment choices grow narrower

Analysis

Why South Korea’s KOSPI fell far harder than semiconductor profits justified

Record margin borrowing and concentrated retail ownership magnified an otherwise conventional market correction

Jesse JamesJuly 29, 2026

Why South Korea’s KOSPI fell far harder than semiconductor profits justified

A semiconductor chip (Sept. 1, 2022) against a backdrop of stock market charts (April 25, 2025) | Image: Unsplash, Unsplash, edited by Korea Pro

The KOSPI’s retreat exposed how record retail borrowing and extreme concentration in two semiconductor companies could turn a change in market expectations into a forced-selling cycle.

The index closed 2025 at 4,214.17 and more than doubled over the next six months, reaching a record close of 9,114.55 on June 22. It then fell to 5,647.65 by Wednesday morning.

Near the peak, Samsung Electronics and SK Hynix represented almost 55% of the KOSPI’s total market value, while outstanding margin loans reached a record $26.7 billion (38.63 trillion won) two trading sessions after the index topped.

The rally rested on

LATEST ANALYSIS

01Why South Korea cannot rebalance growth without stronger regional clusters
02Samsung, SK Hynix rejection exposes South Korea’s chip-grid financing problem
03Trump’s Cheongung social media post tests Seoul’s refusal to arm to Ukraine
04Lee Jae Myung risks public trust as South Korea rewires its justice system
05South Korea turns to Central Asia as Iran war tests its energy resilience
06Houthi seizure of Mokha sharpens South Korea’s Hormuz deployment dilemma
07Japan’s stronger yen may cut Korea’s import bill while raising funding costs
08South Korea leans on Europe as Hormuz deployment choices grow narrower

Why South Korea’s KOSPI fell far harder than semiconductor profits justified

LATEST ANALYSIS

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Jesse James