Asian equities traded cautiously on Friday, but the week's action highlighted a clear divergence between South Korea's KOSPI and Japan's Nikkei 225. The KOSPI slipped 0.5% and is on track for a 5% weekly loss, while the Nikkei 225 fell 0.9% yet remains poised to end the week up 1.2%. Both markets are heavily exposed to the AI hardware cycle, but Korea's concentrated memory-chip trade has absorbed far more damage.
Korea's chip-heavy index under pressure
The KOSPI is heading for its seventh consecutive weekly decline after Thursday's 4.6% plunge, when Samsung Electronics and SK Hynix tumbled 6.3% and 10.4%, respectively. The selloff followed renewed weakness in US storage and semiconductor shares, reviving concerns that AI-related growth may already be priced in. Korea's vulnerability is partly structural: Samsung and SK Hynix accounted for roughly 53% of the KOSPI's market value when the index crossed 9,000 in June. Their gains helped the benchmark more than double in the first half, but that same concentration now magnifies every reversal in memory-chip sentiment.
Investors are also questioning capital allocation and whether record cash generation will translate into larger shareholder returns. That leaves the KOSPI unusually sensitive to earnings guidance and shifts in Wall Street's AI trade, even while demand for high-bandwidth memory remains strong. The recent sharp drop in Samsung and SK Hynix underscores how quickly sentiment can turn.
Nikkei's weekly gain masks fragility
The Nikkei 225 has shown more resilience than Seoul, but its weekly advance masks a fragile exporter trade. Friday's weakness was concentrated in AI-linked names: Lasertec dropped nearly 10%, SoftBank Group lost more than 6%, and Screen Holdings fell over 4% in early trading, pressured by higher energy costs and semiconductor concerns. The yen adds another layer of tension. It traded near 158.5 per dollar after last week's rare joint intervention by Japan and the US briefly drove it from above 163 to around 155. A weaker yen supports exporters' overseas earnings, but rapid depreciation lifts import costs and raises the risk of further official action.
The Nikkei is therefore caught between two opposing forces. Yen weakness helps large exporters, while intervention-driven strength can compress their earnings outlook. Its weekly gain looks firmer than the KOSPI's, but it remains vulnerable to a sharp move in US yields or the currency. As noted in our earlier coverage of the AI selloff and Fed uncertainty, the path of US monetary policy is a key swing factor.
Payrolls and oil could decide the next leg
Investors are now awaiting US payrolls data, with economists expecting about 80,000 jobs added in July after a 57,000 increase in June, and unemployment holding at 4.2%. Futures markets placed the chance of a September Federal Reserve rate cut near 57% on Thursday, leaving the report capable of shifting bond yields and technology valuations. JPMorgan economist Michael Feroli expects a strong number to be difficult for equities because it would reinforce the case for higher-for-longer rates. A softer report could provide relief by pulling Treasury yields lower and reducing pressure on expensive growth stocks.
Oil prices are another wildcard. Brent rose 1% to $83.38 a barrel after gaining 3.8% on Thursday, as renewed Houthi attacks and proposed Iranian restrictions on vessels in the Strait of Hormuz revived supply concerns. Although crude remained down sharply for the week, a sustained rebound would increase costs for Japanese and Korean companies and complicate the inflation outlook.
For now, the KOSPI remains the clearer expression of stress in Asia's AI trade. The Nikkei is holding up better, but that cushion could disappear if payrolls lift yields, oil keeps climbing, or the yen becomes disorderly again. As we've seen in recent rebounds and pullbacks, the two indices often move in tandem, but this week's divergence highlights the importance of market structure and currency dynamics.
This article is for informational purposes only and does not constitute financial advice.
