Hello, I am a specialized writer for Daily Stock. Today, we will analyze the power infrastructure value chain, where KOSPI foreign inflows are highly concentrated in tandem with AI CAPEX investments by Nasdaq Big Tech companies.
Key Summary
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As massive AI capital expenditures (CAPEX) from Nasdaq Big Tech companies focus on resolving power bottlenecks, energy and power grid infrastructure companies are emerging as market leaders in the KOSPI market.
Foreign investors are heavily net buying SMR (Small Modular Reactor) and ESS (Energy Storage System) related stocks such as Doosan Enerbility and Samsung SDI, driving the KOSPI's upward momentum.
Despite the pressure of the US 10-year Treasury yield (US10Y) and a strong dollar (DXY), the K-power grid value chain, which has secured substantial order backlogs, offers distinct valuation appeal compared to Nasdaq growth stocks.
Under the high exchange rate environment (KRW/USD at 1,467.80), FX gains in export-heavy power equipment and battery sectors also act as a major catalyst for the inflow of funds.
Current Situation Summary
As of April 19, 2026, the KOSPI closed at 6,191.92, continuing its historical strength, while the Nasdaq index also recorded a phenomenal 24,468.48.
The core theme of the recent market is a structural expansion beyond pure AI semiconductor chipsets into the 'power value chain' required for data center operations.
According to Daily Stock's proprietary Fear & Greed Index, the KOSPI is currently in the Greed phase (61.4), showing a rapid recovery in sentiment from Extreme Fear (17.7) just one month ago.
The Nasdaq Fear & Greed Index is also at the Greed level (68.1), completely escaping the Extreme Fear phase (16.1) from three months prior and strongly reflecting expectations for the Big Tech infrastructure investment cycle.
KOSPI's top foreign net buying list is dominated by AI power infrastructure-related stocks such as Doosan Enerbility, Samsung SDI, and HD Hyundai Electric at the very top.
South Korean hardware and heavy industry infrastructure companies, which had been relatively marginalized compared to US S&P 500 growth stocks or the Philadelphia Semiconductor Index (SOX), are now fully enjoying the trickle-down effect of the Nasdaq CAPEX rally.
Financial Analysis
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As Big Tech's construction of AI data centers accelerates, the order backlogs of KOSPI power equipment and energy companies are breaking all-time high records since their inception.
The extra-high voltage transformer and SMR sectors have positioned themselves as highly profitable core cash cows, directly translating into immediate improvements in operating profit margins.
| Rank | Foreign Net Buying Highlight Stocks | Core AI Value Chain Relevance | Estimated 2026 Revenue Growth (YoY) | Supply and Demand Momentum |
|---|---|---|---|---|
| 1 | Doosan Enerbility | Power supply via SMR & gas turbines for Big Tech | +24.5% | Expectations for mega SMR orders |
| 2 | Samsung SDI | High-capacity ESS for data center backups | +18.2% | Expansion of North American ESS projects |
| 3 | HD Hyundai Electric | North American extra-high voltage transformer replacement cycle | +31.0% | Securing long-term supply contracts |
| 4 | LS ELECTRIC | Switchgear and integrated power infrastructure solutions | +22.8% | Ongoing benefits from power bottlenecks |
(* Specific revenue estimates, excluding same-day market prices, utilize the latest securities firm consensus average as of April 19, 2026.)
In particular, Samsung SDI is excellently offsetting the EV demand slowdown by expanding sales of high-capacity ESS for data centers, further strengthening its financial soundness.
Doosan Enerbility possesses strong momentum to simultaneously achieve top-line growth and a profit turnaround as its cooperation with major SMR companies in the US materializes.
Valuation
The AI software and Big Tech companies currently leading the Nasdaq 100 index are trading at an average forward P/E (Price-to-Earnings ratio) of over 30 to 40 times.
Conversely, the KOSPI power equipment and energy sectors, which supply essential energy to these entities, remain at multiples of 10 to 20 times, highlighting their relative undervaluation appeal.
In a macro environment where the US 10-year Treasury yield (US10Y) continues to stay high, the discount rate on future cash flows increases, potentially limiting the multiple expansion of high-PER tech stocks.
Therefore, KOSPI infrastructure stocks, which guarantee Earnings Per Share (EPS) growth based on clear earnings visibility, are acting as a stable safe haven for global smart money.
The rise in the KRW/USD exchange rate (1,467.80) due to the strong Dollar Index (DXY) is a favorable variable that maximizes the KRW-converted performance of export-driven power equipment firms.
This ultimately couples with upward earnings revisions, supporting a powerful virtuous cycle rally that stimulates passive foreign fund inflows.
Expert & Institutional Analysis
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Wall Street and major domestic securities firms agree that "the second act of AI innovation is not a battle for chipsets, but a race to secure 'power' and 'cooling' infrastructure," noting that upgraded CAPEX guidances from Nasdaq Big Techs prove this point.
Large institutional investors diagnose that as the pace of Big Tech data center construction hits power grid limits, the structural strength of SMR and extra-high voltage transformer-related stocks will extend long-term beyond a mere cyclical trend.
Regarding the core background of the KOSPI surpassing the 6,100 mark, one investment bank analyzed it as "not a simple liquidity rally, but a process of structural revaluation of Korean hardware companies within the global AI value chain."
The prevailing assessment is that the foundational strength of the overall Korean stock market has leveled up as the profit contribution of the power equipment sector combined with the existing boom in the semiconductor cycle.
Risk Factors
The most critical risk to watch is the possibility that Big Tech companies may preemptively slow down their CAPEX investments if concerns over delayed AI service monetization materialize.
Should this scenario unfold, power and infrastructure orders would be deferred, and the order momentum held by related stocks in the KOSPI market could also be severely impaired.
Furthermore, if expectations for Federal Reserve rate cuts recede and Treasury yields spike further, the VIX (Volatility Index) could soar, and the risk of global funds exiting emerging market equities cannot be ruled out.
Heightened domestic-first policies or power grid regulations arising from political uncertainties, such as the US presidential election, are also potential flashpoints that could pressure the profit margins of domestic exporters.
Investment Perspective Summary
The current supply-demand market dynamic of the KOSPI should be interpreted as the result of a massive paradigm shift where Nasdaq-driven AI innovation is translating into physical infrastructure demand.
Investors might consider a barbell strategy—maintaining long-term investments in US growth stocks while concurrently incorporating KOSPI power/energy stocks that enjoy substantial trickle-down effects at the lower end of the value chain.
However, given the unprecedented volatility in macro variables (exchange rates, interest rates), it is advisable to time market entries by carefully checking quarterly order disclosures and earnings guidances rather than blindly chasing prices.
Ultimately, it is time to remember that an earnings-driven market—where companies proven by numbers, not just expectations, defend their multiples—has arrived, warranting a review of portfolio fundamentals.
Frequently Asked Questions
Q1. How can I check the top foreign net buying stocks on the KOSPI?
You can track daily and cumulative foreign net buying data in real-time through the Korea Exchange (KRX) Information Data System or the 'Trading Trends by Investor' menu on major brokerage firms' HTS/MTS.
Q2. Why do Nasdaq Big Tech CAPEX investments affect KOSPI power equipment stock prices?
When Big Tech companies inject massive capital (CAPEX) to build AI data centers, immense power is required to resolve bottlenecks. During this process, orders flock to globally competitive South Korean transformer, ESS, and SMR companies.
Q3. Isn't it unfavorable for investment given the current high KRW/USD exchange rate?
Normally, a high exchange rate raises concerns about foreign capital outflows. However, for export-centric power equipment and energy sectors that receive most of their revenue in dollars overseas, it provides a positive defensive effect by significantly boosting KRW-converted earnings.
Q4. Why are tech stocks hit when the US 10-year Treasury yield (US10Y) rises?
When Treasury yields rise, the market's risk-free rate increases, meaning a larger discount rate is applied when discounting a company's future growth value to its present value. This relatively diminishes the multiple appeal of tech stocks that are highly valued based on high growth expectations.
Q5. What exactly does the concern over delayed AI monetization mean?
It refers to a situation where global companies are spending astronomical costs to build AI infrastructure, but fail to generate sufficient free cash flow exceeding the invested costs in the end-user service areas utilizing it. This is a key risk that could directly lead to a reduction in Big Tech investments in the future.