First, a fact that’s been overlooked: this rebound came from a deep hole, not from the foot of a mountain.

On May 11 this year, KOSPI hit a record high of 7,822 points, at one point gaining 85.6% year to date and leading global markets. Before today’s open, the index was just above 5,000 points—down more than 30% from its peak. So today’s big bullish candle is essentially an oversold recovery, not the start of a trend.

What happened today

On November 10, KOSPI opened up 4.55% at 5,247 points, with gains widening to 5.5% around 9:15 and touching 5,297 points. Because the gains came so quickly, the Korea Exchange triggered a buy-side sidecar for KOSPI at 9:06, halting programmatic buying. KOSDAQ followed at 9:10—its first such trigger in nine trading days.

Samsung Electronics rose nearly 6%, topping 201,000 won; SK Hynix gained more than 9%, to 1,239,000 won. KOSDAQ also rose more than 4%.

The catalyst wasn’t in Seoul, but in New York

Overnight, U.S. stocks rose: the Dow +2.15% (52,389 points), the S&P 500 +2.35%, and the Nasdaq +2.74%. The Philadelphia Semiconductor Index surged 6.85% in a single day. AMD rose 13.26%, Broadcom 8.78%, and Micron 6.25%; only Nvidia fell against the trend, down 4.27%—showing this wasn’t a broad rally across all AI stocks, but a targeted recovery in memory and semiconductors.

Pay attention to the flow of funds: institutions were net buyers of 257.5 billion won in KOSPI, while retail investors and foreign investors were net sellers (269.4 billion / 17 billion won). The won weakened at the same time, to 1,345.3. Foreign investors haven’t returned, so this is still just “institutional bargain-hunting + short covering.”

Is this a rebound or a new rally?
My view: a short-term rebound is more likely.
There are three reasons: the driver was a single day of external market sentiment, buying was concentrated in the two heavyweight stocks, and foreign investors are still selling.

But we can’t be bearish in the medium term—the fundamentals are genuinely strong:
SK Hynix Q2 revenue was 79.3 trillion won, with operating profit of 60.5 trillion won and an operating margin of 76%; first-half revenue surpassed 100 trillion won for the first time;
Samsung Q2 operating profit was 89.49 trillion won, up 1,813% year over year, with the DS division contributing 99.7%;
Both companies agree that memory supply will remain tight from the second half of 2026 through 2027, with new capacity not coming online effectively until 2028. JPMorgan and Goldman Sachs have both raised their KOSPI targets to 9,000 points.

The problem is that the strong fundamentals have already been priced in once. Both companies posted record results in July, yet their stocks fell that day—SK Hynix was down 5.64%. The market has grown desensitized to “earnings beats”; what’s missing now is “incremental growth,” not “another confirmation.”

The four areas I’m watching most

1️⃣ The purest HBM play—SK Hynix. HBM4 is already in mass production, and it has signed five-year long-term contracts with more than a dozen cloud providers, giving it the strongest pricing power while supply is locked up.
2️⃣ A catch-up story at a valuation discount—Samsung. It was first to begin mass production of HBM4 in February, expects HBM4 revenue to more than triple quarter over quarter in Q3, and also benefits from the stabilizing effects of its foundry and consumer businesses.
3️⃣ The “picks and shovels” of equipment, materials, and packaging and testing—Hanmi Semiconductor, EO Technics, SEMES, as well as Micron, SanDisk, Seagate, and Western Digital in the memory supply chain. During an upcycle, their upside and predictability are often better than those of finished-product makers.
4️⃣ A perspective for crypto investors—tokenized stocks. The NYSE has just designated Avalanche as the main chain for clearing and settling tokenized securities, and Dinari already has more than 250 tokenized U.S. stocks. A market like Korean equities—with Asian trading hours, limited access for foreign investors, and currency friction—is precisely where 24/7 on-chain trading has the greatest potential.

Three variables to watch closely

U.S. October CPI (due tonight; a higher-than-expected reading would immediately derail this rebound), cloud providers’ AI capex guidance, and HBM4 yields and deliveries. Add one domestic risk: KOSPI is too dependent on Samsung and Hynix; the index is practically leveraged to these two stocks, and if either runs into trouble, the index has no cushion.

In short: this is a high-quality oversold rebound, but it doesn’t yet qualify as a new rally. For the trend to take hold, three things need to happen at once: foreign investors return, CPI comes in within expectations, and capex guidance is revised upward.

The above is a summary of public information, not investment advice. Markets carry risk; manage your own positions 🙏

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