KOSPI jumps 3% as Treasury yields spike, raising Asia risk question

South Korea's KOSPI jumped more than 3% on reopening after a holiday, lifting MSCI's Asia-Pacific index outside Japan by 0.8% as US Treasury yields spiked.

"DRAM and NAND industry demand continues to significantly exceed industry supply," Sanjay Mehrotra, chief executive officer at Micron Technology, said on the company's fiscal third-quarter call, pointing to the memory tightness driving the regional advance.

Memory and storage names led the rally. SanDisk climbed 8% to $1,778, Western Digital rose 6% to $540, and Micron gained 5% to $1,017, back above $1,000 for the first time since July 23. The Roundhill Memory ETF advanced 5% to $60.20, up 106% since its April 2 debut, while Seagate Technology has gained 254% year to date.

The divergence between rising equities and spiking Treasury yields is the crux. Higher global yields typically pressure emerging-market equities by tightening financial conditions and lifting the discount rate on growth assets. If Asia is mispricing that rate risk, a correction could follow, with Nvidia's earnings on Aug. 26 the next test of whether the AI-driven memory demand story holds.

The KOSPI's return to a bull market reflects a regional bid concentrated in semiconductor names. Samsung Electronics and SK Hynix, the two heaviest weights on the index, have been the primary beneficiaries of the memory shortage narrative, with SK Hynix shares climbing 4% to $173. The index had already risen 2% overnight before the holiday and 4.4% in a prior session, extending a run that has outpaced most regional peers.

The Treasury yield spike complicates the picture. Wall Street ended Friday slightly lower, with the S&P 500 slipping 0.2% to 7,786 and the Nasdaq dropping 0.3% to 26,729, after retail sales fell 0.6% in July against expectations for a 0.1% gain. The softer consumer data raised concerns about the health of the US economy even as bond yields climbed, with the expiry of the US-Iran ceasefire adding to oil-price pressure that feeds inflation expectations.

The Mispricing Question

The question is whether Asian equities have priced in the rate risk embedded in the Treasury move. Higher yields raise the cost of capital for growth-heavy markets, and emerging-market equities are typically the first to feel the squeeze. Yet the KOSPI's 3% jump suggests investors are looking through the yield spike to the memory supply-demand imbalance.

Bank of America reiterated a Buy rating on Micron with a $1,550 target, projecting fiscal 2030 earnings per share of $200 to $250 against a Street consensus peak of $160 to $170, arguing memory is entering a structurally stronger phase. RBC Capital Markets raised its SanDisk target to $1,600 and Wells Fargo lifted its to $1,550, both keeping neutral ratings.

What to Watch

Memory and storage names remain 15% to 30% below their June highs after a July pullback driven by profit-taking and concerns about more efficient models out of China. RBC and Wells Fargo, both keeping neutral ratings on SanDisk, flag that much of the multi-year demand outlook is already priced in, creating resistance to further gains. Whether the KOSPI holds its gains will depend on DRAM and NAND pricing trends into the tight conditions Micron guides toward beyond calendar 2027, and on Nvidia's Aug. 26 earnings as the next event for the AI trade.

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