Start with the chain, because the chain is the whole story. At the top is SK Group chairman Chey Tae-won. Below him sits SK Inc., then SK Square, then SK Hynix, then a US holding company called AI Co., and at the bottom, Solidigm. Three of those companies already trade on the stock market. The Solidigm duplicate listing fight is about whether the bottom one becomes the fourth.
It moved from rumor to plan last week. Solidigm, the flash memory unit SK Hynix bought from Intel, has picked Goldman Sachs and Morgan Stanley to lead a US IPO, Bloomberg reported on Oct. 7. The listing could come as soon as 2027, raise about $10 billion and value the company at up to $100 billion. SK Hynix says no specific plan has been confirmed.
Why investors hate a “duplicate listing”
A duplicate listing is when a parent company and its own subsidiary are both listed. It sounds harmless. But think about what an SK Hynix share already is: a slice of everything SK Hynix owns, including Solidigm. If Solidigm gets its own ticker, investors who want the flash memory story can buy it directly. They no longer need the parent. Over time the parent tends to trade at a discount to the value of what it holds.
In Korea this is not theory. It is one of the most cited reasons for the so-called Korea discount, the gap between Korean stock prices and similar companies elsewhere. I wrote about that gap when SK Hynix listed in New York. Many retail investors still remember 2022, when LG Chem listed its battery business, LG Energy Solution, and a lot of LG Chem holders felt the value they owned had walked out the door.
Korea changed the rule. The rule stops at the border.
Regulators responded. Since August, the Financial Services Commission has allowed parent-subsidiary listings at home only as exceptions, the Korea Times reported.
Solidigm would not list at home. It is a California company and would list in the US, so the Korea Exchange never screens the deal. What does cross the border is a set of duties for the parent’s board. The FSC’s own guidelines say five specific duties for a parent company’s board also apply when a listed parent lists a subsidiary overseas. In plain words: the board must show it thought about existing shareholders. Regulators say penalties can come after the listing if it didn’t.
That is why the Solidigm duplicate listing debate has turned into a pressure campaign rather than a legal block. A retail shareholder platform called Act says it will ask the Korea Exchange how its rules apply to overseas listings. Lawmaker Ahn Cheol-soo has publicly asked Chey to explain the plan.
What SK Hynix shareholders gain and lose
There are two honest sides here.
The gain: memory chips eat cash. SK Hynix has to pay for HBM, server DRAM and enterprise SSDs at the same time. If outside investors put $10 billion into Solidigm, that money builds Solidigm’s factories instead of coming out of SK Hynix’s pocket.
The loss: new Solidigm shares mean SK Hynix owns a smaller slice of Solidigm’s future profits. And those profits are no longer small.
Why now: the turnaround
SK Hynix agreed in 2020 to buy Intel’s NAND flash business for about $9 billion and paid in two stages. The timing looked terrible at first. Solidigm lost 3.3 trillion won in 2022 and 4 trillion won in 2023, and by the end of 2023 its equity was below zero.
Then AI data centers started buying huge solid-state drives, the storage that holds the data AI models pull from. In the first half of 2026, Solidigm made 5.84 trillion won in net profit on 12.25 trillion won in sales, according to SK Hynix’s semiannual report. That is almost 48 won of profit for every 100 won of sales.
A business that was underwater three years ago is now worth listing. That is exactly what makes shareholders upstream nervous. The same chairman whose divorce case put SK’s ownership in the headlines now sits at the top of a chain that may get one link longer.
My take: One company, four tickers.
Not advice. Just how I see it.