SK Hynix's $26.5B bet: biggest foreign IPO ever, worst timing possible

SK Hynix just did something no foreign company has done before: raised $26.5 billion in a single U.S. public offering. The previous record holder? Alibaba, with $25 billion back in 2014. This isn't just bigger—it's a full lap around the competition.

On July 10, the South Korean memory chip maker sold 177.9 million American depositary shares at $149 each. Investors showed up so hard the offering was oversubscribed seven times over, which is finance speak for "everyone wanted in." The stock popped 14% on day one, because apparently that's what happens when you're the company making the chips that make AI actually work.

SK Hynix makes high-bandwidth memory—HBM—the specific silicon that feeds data to the processors training your favorite large language models. They own 56.4% of that market. Put another way: if AI infrastructure were a restaurant, SK Hynix would be the chef, the sous chef, and half the line cooks.

The math is straightforward. Data centers are exploding. AI needs memory chips. Memory chips need to be made faster and in more volume than anyone thought possible six months ago. SK Hynix's chairman told CNBC that customers aren't asking for more capacity—they're telling him "that's not enough, man, and well, we need more." Even after SK Hynix promised to double capacity in five years.

So what's the catch? Timing. The company just locked in $26.5 billion at what might be peak enthusiasm for AI infrastructure plays. The money funds a $390 billion chip cluster in Yongin, South Korea, plus advanced packaging plants and equipment. Noble stuff. Necessary stuff. But also stuff that takes years to build.

Here's what keeps analysts up at night: tech sentiment is fragile. If AI earnings disappoint—and they could, because we're still in the "everyone's buying chips because everyone else is" phase—share prices start falling around the back half of 2027. SK Hynix will be halfway through a decade-long capital commitment, holding a stock that was priced for perfection.

Maybe they nailed the timing. Maybe geopolitics stays stable enough for them to actually build what they promised. Or maybe they just pulled off the largest foreign IPO in history right before the music stopped. Either way, it's the most expensive corporate poker move in recent memory.