Samsung and SK Hynix shares fall on $1.3T chip plans

Samsung Electronics and SK Hynix shares dropped sharply on Monday, June 29, 2026, as investors weighed reported decade-long spending plans of up to 2,000 trillion won ($1.3 trillion) on semiconductors, AI data centers, and related infrastructure. The sell-off came ahead of and during a presidential briefing where South Korea unveiled its Three Mega Projects, leaving shareholders to ask whether mega investments will protect long-term chip leadership or strain balance sheets.

Key Takeaways

• Samsung fell 4.7% and SK Hynix slipped 3.1% on Monday as markets reacted to reports of combined 10-year spending plans worth up to $1.3 trillion.
• President Lee Jae Myung unveiled the Three Mega Projects with Samsung and SK leaders, targeting chip hubs, AI data centers, and physical AI outside Seoul.
• Samsung Electronics and SK Hynix are each expected to build two new fabrication plants in South Korea's southwestern Jeolla region.
• The government framed the plan as a response to AI-driven chip demand and competition from Taiwan, China, and Japan.
• Investors are balancing strategic upside against concerns about capital intensity and whether AI spending is overheating.

Why did Samsung and SK Hynix shares fall on Monday?

Shares of Samsung Electronics and SK Hynix plunged on Monday after reports surfaced that the pair were expected to unveil investment plans worth more than a trillion dollars, according to CNBC. Samsung Electronics' stock was down 4.7%, while SK Hynix was 3.1% lower.

For investors, the reaction was about scale, timing, and execution risk. When two of South Korea's most important listed companies signal a decade of extraordinary capital spending, markets often price in higher future costs and uncertain returns before they celebrate strategic ambition. The BBC noted that some investors have raised concerns about the huge amounts of money being poured into AI, which has triggered volatility in related shares.

What are South Korea's Three Mega Projects?

South Korea has unveiled plans for about $1 trillion of investments to build out the country's chip manufacturing and artificial intelligence capabilities in the coming years, the BBC reported. The initiative is part of the country's Three Mega Projects to develop new chip production hubs, data centres, and robotics technology.

President Lee Jae Myung announced the plans in a televised event alongside the leaders of Samsung and SK Hynix, the country's two largest chipmakers. He said the plan is aimed at rejuvenating the economies of areas outside the capital Seoul, where most advanced factories are concentrated. "We must secure the core elements of AI faster than any other country," Lee said. "Semiconductors, physical AI, and AI data centres are the triple axis for a great leap forward."

The announcement comes as regional rivals like Taiwan, China, and Japan are investing heavily in chip factories as the AI boom pushes up demand for semiconductors.

How much are Samsung and SK Hynix planning to spend?

According to CNBC, Samsung Electronics and SK Hynix were expected to unveil major investment plans of up to 2,000 trillion won ($1.3 trillion) over the next 10 years, as reported by the Korea Economic Daily. The investment plans were announced during a government briefing held Monday and chaired by President Lee Jae Myung, the presidential office said Sunday.

The Maeil Business Newspaper reported that Samsung Group would announce a 1,000 trillion won ($646 billion) investment program spanning the next decade. That blueprint was said to cover semiconductor fabs, AI data centers, advanced packaging, batteries, and displays, including roughly 300 trillion won for new fabs in southwestern South Korea, 360 trillion won for the Yongin semiconductor cluster, and more than 350 trillion won for AI data centers. CNBC noted that the report did not clarify whether those figures overlap.

The BBC described the national package at about $1 trillion, a slightly lower headline figure than some Korean media estimates. That gap matters for investors tracking capex assumptions.

Where will the new chip fabs be built?

Reuters reported that Samsung Electronics and SK Hynix will invest in two new fabrication sites in South Korea, according to the government. Samsung Electronics and SK Hynix will each construct two state-of-the-art fabrication plants in Jeolla Province, creating what officials described as a second national semiconductor cluster to complement the existing production belt around the Seoul metropolitan area.

The BBC said the companies are expected to build a semiconductor manufacturing hub in the southwest of the country. Lee also announced plans to build other AI infrastructure hubs outside of Seoul, spreading investment beyond the capital region.

What does this mean for your investments in chip stocks?

If you hold semiconductor names directly or through index funds, Monday's move is a reminder that even strategic news can hit prices in the short term. Samsung and SK Group count customers such as Nvidia among the biggest beneficiaries of AI infrastructure spending, and SK Hynix's stock market valuation topped $1 trillion in May, driven by the boom in AI data centres, the BBC reported. Yet that strength did not prevent a sharp one-day decline when spending headlines dominated.

Heavy investment can secure market share when demand is strong, but it can also compress free cash flow and pressure returns if chip prices soften or projects slip. That is why markets sometimes sell first when trillion-dollar figures enter the conversation. If you are building a portfolio around AI, semiconductors, or passive income from diversified equity exposure, separate headline totals from investable reality. Watch official filings, capex guidance, and fab timelines. For broader context on sector swings, see our Wealth Hacks & Passive Income coverage.

Are investors right to worry about an AI spending bubble?

The policy case is straightforward. The surge in demand for chips to power AI has contributed to global semiconductor tightness, and Samsung and SK Hynix have been among the biggest beneficiaries of spending on AI infrastructure. U.S. tech giants including Google, Amazon, and Meta have said they will spend $650 billion on the technology this year, the BBC reported.

The investment case is less one-sided. Some investors have raised concerns about whether enormous AI-related spending is sustainable, especially when stock prices already reflect years of optimistic growth. Monday's declines suggest the market is weighing South Korea's attempt to lock in chip leadership against the risk that capital budgets are outpacing near-term profits. The next phase for investors is tracking how much of the announced plan turns into committed spending—and whether the returns justify the check.