SK Hynix Stock Rallies 12% as AI Spending Drives Chip Demand

TLDR

• SK Hynix stock jumped 12% Monday, driven by foreign buying after strong U.S. tech earnings.
• Major U.S. tech firms reaffirmed heavy investment plans in AI data centers last week.
• Samsung Electronics lagged behind, weighed down by the threat of an 18-day worker strike starting May 21.
• SK Hynix has a labor stability advantage, having already resolved profit-sharing disputes with employees.
• Citigroup has cut its expectations for Samsung, while analysts see growing opportunity for SK Hynix.

SK Hynix stock opened the week on a strong note, jumping 12% on Monday as foreign investors piled in following a wave of upbeat earnings from major U.S. tech companies.

The buying was fueled by confidence that AI data center spending is not slowing down. Several big U.S. tech firms reported solid quarterly results last week and reaffirmed their capital expenditure plans for AI infrastructure.

SK Hynix is a key supplier of high-bandwidth memory (HBM), the type of advanced chip that powers AI accelerators. Strong signals from the demand side tend to move the stock quickly.

Samsung’s Labor Troubles Weigh on Rival

While SK Hynix rallied, bigger rival Samsung Electronics underperformed. Samsung’s stock struggled to keep pace with the broader chip sector rally.

The reason comes down to labor risk. On April 23, Samsung’s union held a large-scale protest, demanding a bigger slice of profits from the company’s chip division. An earlier proposal from Samsung — which included bonuses and wage increases — was rejected.

Now the union has threatened an 18-day work stoppage starting May 21 if no deal is reached. That threat is sitting uneasily with investors at a time when AI memory demand is growing fast.

Samsung has said it plans to keep talking with the union and is prepared to manage any potential disruption to production. But analysts are not fully convinced that will be enough to contain the financial impact.

Research firm Citigroup has already lowered its expectations for Samsung, citing the potential cost of concessions or additional bonus schemes. Any extra labor costs could squeeze margins in a business that has recently been posting strong profits from AI-related demand.

SK Hynix Holds an Edge

SK Hynix does not have the same problem. The company settled its own profit-sharing dispute with employees earlier, giving it a labor stability advantage that is now showing up in its stock price relative to Samsung.

Other chipmakers in the region are also benefiting from the positive mood. MediaTek and ASE Technology Holding both saw stronger price performance as sentiment around AI chip demand improved.

The broader backdrop is one where demand for advanced memory chips remains healthy. AI data centers continue to require large volumes of HBM, and SK Hynix is well-positioned as a leading supplier.

Samsung’s semiconductor division has been posting strong financial results, driven by the same AI tailwinds. But the labor situation is creating a layer of uncertainty that investors are pricing in right now.

For SK Hynix, Monday’s 12% move reflects the combination of strong sector tailwinds and a cleaner internal picture. No strike threat, no unresolved wage dispute — just a chip company riding the wave of AI infrastructure spending.

Citigroup’s downgrade of Samsung expectations and the growing attention on SK Hynix as a relative winner in the space were among the most recent analyst developments heading into the week.

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