SK Hynix overtakes Samsung Electronics as South Korea's most valuable company for first time since 2000

SK Hynix has overtaken Samsung Electronics to claim the top spot on South Korea's stock market by market capitalization — the first time since 2000 that a company other than Samsung has held the position. The milestone reflects SK Hynix's rapid ascent on the back of surging demand in the AI semiconductor market.

According to Korea Exchange, SK Hynix's market cap stood at 2,084.65 trillion won (approximately $1.36 trillion) as of 12:51 p.m. Monday, edging out Samsung Electronics' 2,084.2 trillion won by 456.1 billion won. Analysts attributed the gap to strong investor expectations tied to growth in the AI semiconductor sector.

Samsung Electronics had held the top market cap position on the domestic bourse continuously since 2000. Before that, Korea Electric Power Corp. dominated the ranking for much of the 1990s, with KT Corp briefly taking the lead in 1999. Samsung Electronics ranked third at the time, behind Korea Electric Power and Posco, but quickly grew to claim the top spot from 2000 onward. Monday's development ends a reign of roughly 25 years and seven months.

The reversal accelerated alongside the growth of the AI semiconductor market. Samsung Electronics' share price surged approximately 498 percent from 59,800 won a year ago to a closing price of 354,000 won on Friday, while SK Hynix soared 1,024 percent over the same period. As of Monday, SK Hynix shares were up 5.82 percent, while Samsung Electronics gained just 0.71 percent.

However, when Samsung Electronics' preferred shares — which carry a combined market cap of 184 trillion won — are included, the total gap between the two companies remains wider in Samsung's favor.

Analysts say SK Hynix's early dominance in the high-bandwidth memory (HBM) market has been decisive. The company has established itself as a key supplier to Nvidia, positioning it as a direct beneficiary of the global buildout of AI infrastructure.

Samsung Electronics, by contrast, operates a far broader portfolio spanning smartphones, home appliances and displays in addition to semiconductors, which analysts say has diluted the impact of the AI memory boom on its overall valuation.

SK Hynix's plans to pursue a US American depositary receipt (ADR) listing have also fueled investor sentiment. Securities analysts expect the listing, if realized, to significantly improve access for foreign investors and potentially open the door to inclusion in global semiconductor indexes, providing a further boost to the company's valuation.

The shift does not reflect weakness at Samsung Electronics, which is also trading near record-high valuations. Rather, SK Hynix's emergence as the biggest beneficiary of the AI semiconductor boom has been strong enough to flip the market cap rankings between the two companies.

Industry observers say AI semiconductor competitiveness and HBM market share will be the key variables determining how the market cap contest between the two companies unfolds going forward.

The change at the top of the Kospi for the first time in 27 years has prompted investors to look for signals embedded in the shift. A recent analysis suggested that a market downturn could follow if SK Hynix's market cap were to surpass Samsung Electronics'.

In a recent report, Lee Jae-man, an analyst at Hana Securities, said the moment SK Hynix's market cap overtakes Samsung Electronics' would mark "the end signal for the current bull market driven by rising corporate earnings."

Lee argued that the market cap reversal is occurring at a time when market expectations for SK Hynix have run well ahead of the company's actual earnings — a sign that excessive optimism has become broadly priced into the market.

The dot-com bubble of 2000 is frequently cited as a cautionary parallel. At the time, US networking equipment maker Cisco Systems climbed to the top of global market cap rankings on inflated earnings expectations, only to collapse sharply — helping to trigger the broader bursting of the market bubble.