American Depositary Receipt shares of SK Hynix Inc. (NASDAQ:SKHY) have rallied more than 50% from their July lows, now almost reclaiming the highs last seen in the session after the company’s initial public offering.

The ADRs changed hands near $187 Tuesday morning, up about 6% on the session and roughly 50% above the July 30 low of $124.72.

SK Hynix priced its Nasdaq listing at $149 on July 9, closed its debut session at $168.01, then climbed to roughly $194 on July 13, its first day of regular-way trading, before tumbling to as low as $124.80 in late July.

What happened in between explains why the recovery matters more than the round trip.

The Fear Was Never About the Numbers

The listing was the largest ever completed in the U.S. by a foreign company, raising $26.5 billion. The following day, SK Hynix’s Seoul-listed shares fell 15.4%, their worst session in nearly two decades.

Then, at the end of July, the company reported the most profitable quarter in its history — second-quarter revenue of 79.32 trillion won, about $59 billion, with an operating margin of 76% and revenue up 257% from a year earlier.

Investors sold that too.

What the market was pricing in was the possibility that the memory cycle had peaked and that cheaper, more efficient artificial intelligence models would eventually require less hardware rather than more.

That argument ran into OpenAI’s GPT-6 Astra, released Sept. 3.

Astra is built to run long multistep tasks on its own instead of answering a single question, an approach the industry calls agentic.

Longer tasks hold far more data in memory at once, which means each query consumes more chips, not fewer.

Korean chip stocks turned immediately. SK Hynix rose more than 7% in Seoul on Monday, after an 8.1% jump in the U.S. listing the previous Friday. Samsung Electronics Co. Ltd. (OTC:SSNLF) gained about 4%.

The product at the center of this is high-bandwidth memory, or HBM, the stacked memory chips that feed data to AI accelerators fast enough to keep them working.

Without enough of it, a processor sits idle. SK Hynix is the primary HBM supplier to Nvidia Corp. (NASDAQ:NVDA) and held roughly 58% of that market in the first quarter.

Ten Days of Inventory Left

The second catalyst arrived the same week. KB Securities reported Monday that Samsung and SK Hynix are each holding fewer than 10 days of finished memory inventory. Together, the two account for about 64% of global DRAM revenue.

The cause is mechanical. HBM4, the newest generation now shipping, consumes roughly three times the wafer capacity of conventional DRAM for the same output.

Every wafer moved to AI memory is supply removed from phones and PCs, which is why prices have kept rising through a stretch when analysts expected them to soften.

TrendForce put second-quarter global DRAM revenue at $154.73 billion, up 59.5% from the first quarter.

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