SKHX Stays Pinned as Foreign Selling Turns the Broadcom Shock Into a Full-Session Flush

From Open Shock to Full-Session Flush

The catalyst was never a Korea story at the source. After its June 3 close, Broadcom guided fiscal Q3 AI chip revenue to roughly $16 billion against a ~$17.2 billion consensus — about 7% light — and that single in-line-not-blowout print was enough to break the reflexive bid under the entire memory complex. Korea opened straight into it. The KOSPI tripped a sell-side circuit breaker minutes after the bell once KOSPI 200 futures fell 5%, and the index never recovered, closing down 5.54% at 8,160.59 after trading more than 6% lower intraday.

SK Hynix bore the brunt. The stock was down 7.44% to ₩2.127 million early before sellers leaned harder into the close, finishing down 9.92% at ₩2.07 million. The leverage products amplified it as usual — single-stock leverage ETFs plunged around 14% as Samsung and SK Hynix, now over 40% of the index weight, unwound in tandem. The SKHX perp tracked the move and then some, printing $1,356 against a morning low near $1,325; the 14-hour window straddled the prior record-high leg, so the perp shows a deeper cut than the underlying.

Foreigners Are the Story Now

By the close, this stopped being about Broadcom and became about positioning. Foreign investors net sold ₩4.3 trillion on the main board on June 5 alone, extending a run that totals roughly ₩27 trillion in net selling over six sessions. Zoom out and the picture is starker: since the start of May, foreigners have dumped about $22 billion of Korean equities, with roughly $12 billion of that in SK Hynix alone.

That is what a crowded-trade flush looks like. SK Hynix was the single most-owned expression of the 2026 AI-memory thesis, which makes it the first place fast money raises cash when the narrative wobbles. The Broadcom guide didn't break demand — it gave a heavily-positioned foreign book the excuse to de-risk a name that had run to a trillion-dollar valuation. For the SKHX perp, there's a second layer: the oracle converts the KRW share price to USD, so KRW weakness during a foreign-outflow episode stacks currency drag on top of the equity drop.

What the Selloff Didn't Touch

The thesis underneath is intact, which is why this reads as a valuation and positioning reset rather than a demand-side break. Just a day before the rout, SK Hynix told investors it had received "tremendously positive" feedback on its proposed US listing, citing strong demand for the advanced memory needed to run AI data centers. The company plans to issue ADRs within 2026 off a confidential filing that one source said in March could raise as much as $14 billion.

The open question is concentration risk, not memory demand. Analysts are openly asking whether South Korea has become too dependent on the AI boom now that two chipmakers drive the entire index. As long as the foreign book keeps selling, the SKHX perp will trade the flow rather than the fundamentals — and the modest bounce off the morning low says the forced part of the selling may be slowing, not that it's done.