Samsung Electronics Surges 11.54%, KOSPI Reclaims 8,300 Points
Claire Weston
Samsung Electronics surged 11.54% and SK Hynix jumped 8.57%, lifting KOSPI back to 8,371 — just four trading days after the index hit circuit breakers twice and cratered to 7,445.
How big was the semiconductor rally?
Samsung Electronics closed up 11.54%, its sharpest single-day gain in recent memory and the single largest contributor to KOSPI's move.
SK Hynix — the world's leading supplier of HBM (high-bandwidth memory, the chips that feed data to AI processors) — rose 8.57%, amplifying Samsung's pull on the index.
This means → the two stocks account for roughly 30% of KOSPI's weighting. When they move together, the index follows almost mechanically.
The market hit circuit breakers four days ago — what changed?
On June 8, Korean equities triggered two circuit breakers in a single session, plunging over 8% and driving KOSPI to an intraday low of 7,445.
Four trading days later the index closed at 8,371.97, a bounce of more than 12% from that trough.
In plain terms = last week was full-blown panic selling; this week turned into a rush to buy back in. The swing is extreme by any historical standard.
What is driving the rebound?
The core catalyst is a rapid reset in AI memory-chain demand expectations — the market is once again pricing in sustained HBM orders rather than a demand cliff.
Brokerages had already raised targets in early June: Samsung to ₩610,000, SK Hynix to ₩4,000,000, arguing both were undervalued after the crash.
This means → institutional money is buying a valuation gap, not chasing momentum. The logic is mean-reversion, not a confirmed trend change.
Can the rally last? What should investors watch?
Signal one: whether trading volume in Samsung and SK Hynix stays elevated. If volume fades, the bounce may be no more than a technical snap-back from oversold levels.
Signal two: whether KOSPI can hold above 8,300 — the psychological level that separates "recovery" from "bull market restart."
Signal three: global AI-semiconductor demand trends and foreign-fund flows. Whether Korean equities reach new highs ultimately depends on whether offshore capital keeps coming in.
Content is for reference only, not financial advice.