The $73 Billion Question: Can SK Hynix's 71.5% Margins Survive Its Own Expansion?

The numbers coming out of Seoul are almost too good to be true. SK Hynix has shattered every record in its history books during the first quarter of 2026, posting 52.6 trillion won in revenue and an operating profit of 37.6 trillion won. That works out to an eye-watering 71.5 percent operating margin — a sequential jump of 1,300 basis points that would make most industrial companies weep with envy.

The engine behind this performance is High Bandwidth Memory, the specialized chips that make Nvidia's AI accelerators tick. But SK Hynix isn't just riding the wave — it's building the next one. The company has confirmed that its entire DRAM, NAND and HBM production for 2026 is already spoken for, with the bulk of those chips heading straight to Nvidia. Counterpoint Research estimates SK Hynix now controls roughly 62 percent of global HBM shipments.

A Factory the Size of a Small City

The M15X megafab in Cheongju represents more than 20 trillion won of investment, and it just kicked off pilot operations. The first clean room is complete, with mass production volumes expected to flow by November 2026. The facility will handle both the current HBM3E flagship and the next-generation HBM4, alongside production lines for sixth-generation 10-nanometer DRAM destined for the HBM4E variant that follows.

A second clean room should be finished before year-end. When M15X reaches full capacity by mid-2027, SK Hynix expects it to churn out roughly 50,000 twelve-inch wafers per month. That's just the appetizer: the first fab in the Yongin semiconductor cluster is slated for completion in May 2027, adding another 350,000 wafers monthly at full tilt and pushing total capacity toward 900,000 wafers per month.

Should investors sell immediately? Or is it worth buying SK Hynix?

The 3 Million Won Bet

The stock closed at 1,680,000 KRW on May 7, a fresh 52-week high that extends a year-to-date rally of roughly 148 percent. In the past 30 days alone, shares have surged 60 percent. SK Securities has thrown down the gauntlet with a 3 million won price target, arguing that a price-to-earnings ratio of ten and sharply higher profit forecasts for 2026 and 2027 justify the call.

That target sits in a different universe from the analyst consensus. MarketScreener pegs the average price target at around 1.77 million won, with the most bullish call among its tracked analysts at 2.5 million won. The SK Securities projection assumes HBM shortages persist, AI margins stay elevated and investors finally accept a higher valuation multiple for memory chip earnings — none of which is guaranteed.

Barclays maintains its overweight rating, noting that the supply-demand gap in memory chips shows "no signs of improvement whatsoever." The bank's view echoes a broader Wall Street thesis: the hyperscalers are still spending like there's no tomorrow. Meta has lifted its capital expenditure ceiling to $145 billion, while Microsoft plans $190 billion for calendar 2026.

Cash Pile and Concentration Risk

SK Hynix ended the quarter with a net cash position of 35 trillion won — a war chest that funds the aggressive capacity buildout without straining the balance sheet. But the company's success has created an uncomfortable dynamic in the Korean stock market. Together with Samsung Electronics, SK Hynix now accounts for 42.2 percent of the entire KOSPI market capitalization, a concentration that has nearly doubled in a year.

The central question hanging over the stock is whether operating margins above 70 percent are sustainable when the industry is flooding the market with new capacity. The M15X fab alone will add meaningful supply by late 2026, and the Yongin cluster's 350,000 monthly wafers represent a capacity addition that could reshape pricing dynamics across the memory industry.

SK Hynix at a turning point? This analysis reveals what investors need to know now.

What Comes Next

The next catalyst for the entire semiconductor sector arrives on May 20, when Nvidia reports its fiscal first-quarter results. Analysts expect at least 80 percent revenue growth and a strong forward outlook to sustain the current rally. For SK Hynix specifically, the critical test will be whether HBM can command structurally higher pricing power than the boom-and-bust cycles that have historically defined DRAM markets.

The company has already demonstrated that customers are willing to pay up for guaranteed supply. But the M15X expansion, the Yongin cluster and the broader industry capacity ramp all point toward a market that will look very different 18 months from now. The question isn't whether SK Hynix can keep growing — it's whether the margins that have made this stock a standout can survive the company's own success.

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