The $696 Billion Milestone: SK Hynix's Record Rally Meets a $14 Billion Production Bet

SK Hynix crosses $696B market cap as AI-driven HBM demand fuels record profits, with Q1 operating margin at 71.5% and next-gen HBM4 production starting November.

The numbers coming out of SK Hynix are staggering by any measure. On Monday, the South Korean chipmaker's market capitalization crossed the 1,000 trillion won threshold for the first time — equivalent to roughly $696 billion — after shares surged 12.52 percent to 1,447,000 won. The rally has been nothing short of extraordinary: the stock has more than doubled since the start of the year, gaining approximately 114 percent, and sits nearly 184 percent above its 52-week low from October 2025.

Behind the historic valuation sits an earnings machine operating at full throttle. SK Hynix posted an operating profit of 37.6 trillion won in the first quarter, a record high, with an operating margin of 71.5 percent. Eugene Investment & Securities estimates that DRAM and HBM now account for more than 60 percent of the company's total revenue, and projects server memory demand will grow at least 60 percent by 2027. The brokerage expects second-quarter operating profit to hit 63.7 trillion won when the company reports in July.

The rally has pulled the broader South Korean market along with it. The KOSPI index climbed 5.12 percent to 6,937 points, putting it within striking distance of the psychologically important 7,000 level. Foreign investors piled in aggressively on Monday, buying a net $2.1 billion worth of Korean stocks — the second-largest daily inflow since October 2025 — with SK Hynix alone absorbing $1.24 billion of that total. Institutional investors were also net buyers, while retail investors sold on balance.

Brokerages have responded with a flurry of target price upgrades. Daol Investment & Securities raised its target from 1.6 million won to 2.1 million won, while Korea Investment & Securities and KB Securities set targets of 2.05 million won and 2.0 million won, respectively.

Yet the company is not merely riding a wave of AI euphoria. It is making concrete, multibillion-dollar bets on the next generation of memory technology. In the M15X factory in Cheongju, test equipment has begun rolling in two months ahead of schedule. SK Hynix has invested roughly $14 billion in the facility, which will produce both the current flagship HBM3E chips and the upcoming HBM4 generation. Mass production is slated to begin in November.

The technological centerpiece is a validated 12-layer HBM memory stack using hybrid bonding — a process that connects memory layers directly without traditional contact points, delivering higher speeds and lower heat generation. To scale this technology, SK Hynix has ordered a custom-built inline system from Applied Materials and Besi, costing around $15 million. It marks the first time the company has procured such equipment explicitly for volume manufacturing.

The timing aligns with an aggressive push by major US technology companies into AI infrastructure. Amazon, Microsoft, and Alphabet are each planning budgets of roughly $200 billion this year, while Meta Platforms is spending up to $145 billion. SK Hynix captures a mid-single-digit percentage of those massive outlays, benefiting directly from Nvidia's strategic shift toward physical AI applications such as robotics and autonomous systems.

According to Counterpoint Research, SK Hynix already controls 62 percent of global HBM shipments. Bank of America rates the stock as a sector favorite and forecasts the entire HBM market will reach nearly $55 billion this year. UBS expects SK Hynix to capture around 70 percent of the HBM4 segment within Nvidia's upcoming Rubin platform.

Not everyone is betting on a straight line higher. An analyst at Hana Securities cautioned that semiconductor stocks typically run hard just before earnings releases, but the momentum in earnings revisions has recently faded. A seasonal pullback, he warned, is likely. The true test of the stock's momentum will come in July, when SK Hynix reports second-quarter results — and the market sees whether the production machine in M15X can deliver on its promises.