Latest / International Business with Fexingo: Global Trade, Cross-Border Deals, and Multinational Operations / How US-Korea Semiconductor Links Drive Tech Stock Chaos
Transcript
- Lucas: South Korea's Kospi just suffered its worst single-day drop in over a decade—down 10 percent today alone. The trigger? SK Hynix, one of the world's two dominant memory chip makers, cratered 13 percent. And here's the thing: U.S. tech futures are sliding in sympathy. This isn't a coincidence. Luna: So we're seeing that headline from CNBC this morning—US and Korean tech stocks are now tightly linked and that could worry investors. How tight are we talking? Lucas: Tighter than most people realize. The Korea ETF, EWY, is down nearly 7 percent in just five days. The Nasdaq has dropped 3.5 percent over the same stretch. But the relationship goes deeper than daily correlation. These two economies are literally wired together through semiconductor supply chains. Luna: Right—South Korea makes about 60 percent of the world's memory chips. And those chips go into everything from Nvidia's AI accelerators to Apple's iPhones. Lucas: Exactly. So when SK Hynix—which is Samsung's main rival in high-bandwidth memory—gets hammered, it sends a signal through the entire tech ecosystem. Today's sell-off was reportedly triggered by fears that AI chip demand is slowing, plus new U.S. export controls that are muddying the outlook for Korean chipmakers. Luna: But the U.S. is also a huge buyer of those chips. So a drop in Korean chip stocks hits U.S. companies that depend on them. It's a two-way street. Lucas: That's the feedback loop. When the U.S. restricts which AI chips can be exported to China, it directly affects Korean manufacturers like SK Hynix and Samsung, because they assemble and test many of those chips. Then Korean stocks drop, which spooks global tech investors, who then sell U.S. tech stocks. That feeds back into demand expectations. Luna: And it's not just AI chips. Memory chip prices have been volatile too. There's been oversupply in DRAM and NAND flash for a couple of quarters now. Lucas: That's right. The memory cycle is notoriously cyclical. After a boom in 2024 driven by AI and data center buildout, we're now seeing a correction. SK Hynix warned of weaker than expected demand for conventional memory. That compounds the export control headwinds. Luna: And all of this is happening against the backdrop of a widening U.S. trade deficit. Exports are up, but imports are rising even faster. The latest goods and services trade deficit hit 77-point-6 billion dollars in May, up from 54-point-6 billion in the prior month. Lucas: Ironically, part of that deficit is driven by tech imports—including chips from Korea. The U.S. buys far more semiconductors from Korea than it sells to them. So when Korean chip stocks tank, it actually has a direct impact on U.S. import values and corporate input costs. Luna: Speaking of the show, if you're finding these connections useful—maybe for your job or just to understand the world a bit better—we keep Fexingo ad-free and accessible because of listeners like you. A couple of dollars a month at buy me a coffee dot com slash fexingo genuinely makes a difference in keeping these conversations going. Luna: Yeah, it's a small gesture that really helps us keep the lights on without sponsors. Alright, back to the chip saga. Lucas: So for investors, the key question is: how do you diversify when the two biggest tech markets are so correlated? The traditional play was to hold U.S. tech and some emerging market exposure separately, but that buffer is eroding. Luna: There are ETFs that try to isolate different parts of the semiconductor supply chain. But as we've seen, when a single company like SK Hynix drops 13 percent, it takes down the whole sector. Lucas: One approach is to look at other geographies that are less tied to the us korea chip axis. For instance, India's semiconductor manufacturing push is still early stage, but the country's tech services sector is more independent. The India ETF, INDA, was actually flat over the past week. Luna: And the broader emerging market picture is mixed. China's FXI is up almost 2 percent in five days—decoupling from the Korea-driven selloff. That suggests investors are rotating, at least partly. Lucas: But trade policy is a wild card. The U.S. is increasingly using export controls as a geopolitical tool, and that creates regulatory risk for any company in the crosshairs. The Biden administration's latest rules on AI chip exports—expected to be finalized this quarter—could further restrict what Korean foundries can make for Chinese clients. Luna: So the feedback loop might get tighter before it loosens. What about the dollar? We saw the trade-weighted dollar index tick down slightly to 120-point-7, but it's still very strong. That hurts Korean exporters too, because their products become more expensive in dollar terms. Lucas: Exactly. The strong dollar amplifies the pain for Korean chipmakers. Their revenues are in dollars but costs are in won. So a 6.8 percent drop in EWY this week partly reflects currency headwinds. The won has weakened to 1,637 per dollar. Luna: It's a perfect storm: weakening chip demand, export controls, a strong dollar, and a cyclical downturn in memory. No wonder the Kospi is in freefall. Lucas: And the U.S. tech selloff adds another layer. When Apple briefly became the world's most valuable company again yesterday, passing Nvidia, it felt like a rotation within tech. But today's action suggests broader risk-off sentiment. The VIX is probably spiking. Luna: So for the average listener who holds a tech-heavy portfolio—say an S&P 500 index fund or a Nasdaq tracker—what's the takeaway? Lucas: First, understand that your tech exposure is also Korean chip exposure. Second, don't assume that geographic diversification inside tech is sufficient. Third, keep an eye on trade policy announcements. A single export control rule change can ripple through the entire supply chain. Luna: And if you're in international business, this correlation means you need to monitor both Washington and Seoul for supply chain risk. It's no longer just about tariffs. Lucas: Exactly. The era of decoupling is giving way to something more complex—an interdependence that amplifies shocks. The us korea semiconductor link is the clearest example today. Luna: We'll be watching the next few sessions to see if the Kospi stabilizes and whether U.S. tech can shake off the spillover. Thanks for joining us. Lucas: And if you want to dive deeper into any of these supply chain links, we've covered related angles in past episodes—like how AI chip export controls are rewiring global supply chains. That's episode 138. Luna: For now, keep your eyes on SK Hynix and the export control news. That's the canary in the coal mine.