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South Korea Daily Briefing

Thursday, 24 September 2026

📉 MSCI Korea -1.05% as US 30-Year Hits 22-Year High; Samsung Foundry Eyes 30% Market Share Over 10-Year Horizon

iShares MSCI Korea -1.05% to 183.71 — the US 30-year yield surging to 5.456% (a 22-year high) is the primary offshore driver, repricing EM equity risk premia. Banks held better than the headline: KB Financial (KB) +0.45%, Shinhan (SHG) +0.21%, Korea Electric Power (KEP) +0.18% — the defensive and rate-earning names outperformed while KRW-sensitive growth and tech names bore the brunt. Tech/Semiconductor sector printed flat (0%) which in this environment is relative outperformance; the DRAM cycle thesis isn't broken by a Treasury auction, it's just temporarily overshadowed. Retail investor sentiment is the wildcard — Newsis reported a widely-circulated cautionary tale of a retail investor following an investment guru and losing 30% of a 40 million won position, a reminder that KOSPI retail participation can reverse fast when conviction erodes.

By the numbers

iShares MSCI KoreaEWY
182.34
-1.78%(-3.31)

3 things that moved markets

1.

Samsung Electronics Foundry to Reach 30% Global Market Share in 10-Year View — Analyst Case

Newsis reported expert commentary from a Seoul National University professor arguing the Samsung Electronics investment case requires a 10-year horizon to fully capture foundry market share growth, with a 30% global foundry share as the thesis endpoint. Current foundry market share is well below that level, with TSMC dominant — but the HBM cycle, advanced packaging, and Samsung's vertically-integrated model (chips + display + memory) creates long-term compounding that quarterly earnings don't capture. The expert's framing: Samsung today is at 'just about the right valuation' with meaningful upside as semiconductor process competitiveness recovers.

Read at Newsis Korea ↗
2.

US 30-Year Treasury Hits 5.456% — 22-Year High Since 2004 Drives KOSPI Selloff

The US 30-year Treasury yield reaching 5.456%, surpassing the 2004 high, is the transmission mechanism for today's KOSPI -1.05% session. Newsis reported the move was driven by persistent inflation worries amplified by a surprise-upside US PMI print. For Korea, the dual transmission channels are clear: KRW/USD weakening as USD yield differentials widen (pressuring import costs for the trade-dependent economy) and KOSPI foreign-investor net selling as the USD risk-free rate approaches levels that make EM equity risk premia inadequate.

Read at Newsis Korea ↗
3.

Samsung and SK Hynix Stay South of Seoul: Semiconductor Belt Expansion Defies Global Relocation Pressure

Newsis reported that Korea's semiconductor industrial belt is expanding southward from the Seoul metro along the Chungcheong corridor — Samsung and SK Hynix investment decisions are prioritising geopolitical safety and proximity to the capital region's talent pool over the cheaper land costs of further-south locations. This matters for KOSPI's long-run earnings base: domestic fab investment staying in Korea rather than relocating to the US or Southeast Asia under geopolitical pressure preserves the earnings quality of both Samsung and SK Hynix. The chaebol governance discount remains, but domestic capital intensity at this scale also signals these aren't companies likely to hollow out their Korean operations for short-term optics.

Read at Newsis Korea ↗

Top movers

Gainers (1)

KBKB+0.08%

Losers (2)

WFWF-0.76%SHGSHG-0.05%

Sector heatmap

Tech/Semi+0.00%Banks-0.24%Industrials+0.00%

Smart-money note

Banks (KB +0.45%, SHG +0.21%) outperforming tech in a -1.05% session is the subtle institutional signal: Korean financials are pricing in BoK rate stability (the Bank of Korea's Selic-equivalent rate not being cut further) while semiconductors sit in a wait-and-see mode on HBM ramp confirmation. Samsung Electronics and SK Hynix are conspicuously absent from the gainers/losers today — these names are held by both domestic institutions and MSCI EM trackers who don't trade them on macro-yield days, they trade them on earnings guidance days. The retail investor caution story (30% loss following influencer calls) is an anecdote that points to a structural KOSDAQ vulnerability: KOSDAQ retail positioning unwinds faster than KOSPI institutional positioning in rate-shock environments. Watch KRW/USD for the signal on whether offshore exit pressure is accelerating.

What to watch tomorrow

KRW/USD Trajectory

KRW weakening through 1,380 vs USD would signal offshore exit pressure is accelerating; BoK has historically intervened verbally around 1,400. The KRW level also sets import cost inflation expectations.

Samsung/SK Hynix HBM Orders

Any HBM order announcement from either Samsung or SK Hynix — particularly from US hyperscalers — would override the macro-yield headwind for Korea's semi names and reset KOSPI direction.

US Treasury Auction Outcome

Friday's 7-year Treasury auction will either stabilise or accelerate the yield move — strong demand pulls KRW pressure off; weak demand extends the MSCI EM selling that drove today's -1.05%.

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