SK Hynix lost 15 percent in a single Seoul session to open the week, its largest one-day decline on record, and the fall was violent enough to halt the KOSPI for 20 minutes before trading resumed.
The trigger was a brokerage note rather than a shipment miss. Korea Investment & Securities published a second-quarter profit estimate 8 percent below consensus, citing "slower-than-expected HBM4 (high-bandwidth memory) shipments and heavy reliance on HBM contracts," and the American memory complex followed the anchor stock down. Micron, SanDisk and Western Digital each fell 6 percent, Seagate slipped 4 percent to $869, and the Roundhill Memory ETF dropped 9 percent to $57.52. That fund holds 73 percent of its assets in Samsung, SK Hynix and Micron, so a product bought for diversification amplified the move instead.
Whiplash followed. SK Hynix's US-listed ADR surged 27 percent to $193.92 the next day, then gave back 5 percent to $184.50 in the following session as SanDisk fell 6 percent to $1,658, Western Digital slipped 4 percent to $541 Micron eased 3 percent to $953, and the Roundhill fund settled at $59. 24/7 Wall St. described the selling as "traders lock in gains after a parabolic run" at the end of "one of the strongest rallies in semiconductors this year," and reported no negative catalyst behind it.
The run those traders were protecting explains the twitchiness. SanDisk entered the pullback up 640 percent for the year, Micron up 244 percent, Western Digital up 238 percent and Seagate up 231 percent. Citi held its Buy rating on Western Digital with an $800 target through the volatility, a target that sat above the stock even after the swings. The wrappers around the trade drew a warning of their own, with the same coverage flagging "daily-reset geared single-stock ETFs designed only for short-term trading" that "can lose an investor's full principal in a single session."
Foundry results gave the week its second story. TSMC reported second-quarter revenue of $40.2 billion with a 67.7 percent gross margin and a 60.3 percent operating margin, and guided the third quarter to between $44.6 billion and $45.8 billion, according to the figures on its investor-relations site. A Seeking Alpha analysis read the release as "A Warning Shot" for Nvidia, an argument the next Nvidia report will test, while Oppenheimer named Nvidia, Broadcom and Marvell among its top chip stocks heading into earnings season.
Demand-side voices pushed back all week. Micron chief executive Sanjay Mehrotra guided fiscal fourth-quarter revenue to "$50 billion, plus or minus $1 billion" on multi-year supply agreements, with HBM4 in what the company describes as high-volume shipment. Whether HBM4 volumes track closer to Mehrotra's schedule or to the Korean brokerage's doubts is now the live question under every one of these tickers, and the geared single-stock funds that reset daily around SK Hynix all but guarantee the answer will arrive loudly.
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