SK Hynix Down 5.72%, Hanmi Semiconductor Down 4.72%: Why Did Korea's HBM Stocks Fall While US Chips Rose?

SK Hynix -5.72%, Hanmi Semiconductor -4.72%.

SK Hynix is right in the middle of a joint slide in HBM-related stocks.

These figures are headline values as of 2026-10-23 14:30 KST, taken intraday, so they are not final.

Retail investor:

"US chips rose, so why are we falling?"

Fair question. That's the most puzzling part of today.

How far did the KOSPI fall at the October 22 close?

KOSPI: 5,533.77 (-3.52%)

KOSDAQ: 764.10 (-3.62%)

Both are confirmed closing levels for October 22.

After an index drop of over 3%, it's hard to look at chips in isolation.

How much did HBM stocks fall together?

SK Hynix: -5.72%

Hanmi Semiconductor: -4.72%

Headlines report that Samsung Electronics and SK Hynix fell together, with KOSPI and KOSDAQ also lower.

HBM is high-performance memory stacked alongside AI chips.

This isn't one stock's story. The whole HBM group shook together.

What drove the SK Hynix decline?

Here's what the headlines confirm.

→ Nvidia and others fell on concerns about AI chip demand

→ Loop Capital downgraded on worries about slowing iPhone demand

Details beyond that aren't confirmed, so we won't overstate it.

Still, the demand worry clearly spread across the chip sector.

US chips rose, so why did Korea diverge?

US IT and semiconductors: +1.67%

US industrials: +0.91%

US communication services: -1.11%

US chips gained on the latest trading day, while Korean HBM names fell.

All we can confirm is that the direction split.

So, up or down?

Downside pressure

• SK Hynix - -5.72%, HBM leader weak
• Hanmi Semiconductor - -4.72%, equipment names down too
• December rate-hike bets - 72%, rate pressure persists

Holdings up

• US IT and semiconductors - +1.67%, strength in the prior session
• October rate hold - 94%, low near-term uncertainty
• AI chips - growth potential after next year

Both sides have numbers, so check today's closing figures again.

Just for reference.

PickStock

※ This article is for informational purposes only and is not investment advice.
※ Investment decisions and responsibility rest with the investor.
※ Figures are as of the time of writing and may change.

This article is for informational purposes only and is not investment advice.