Top 10 Weekly Market Sectors & Stocks — April 21, 2026

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Key Weekly Sectors

• Semiconductors: The Q1 earnings release for SK Hynix is the biggest event this week, especially after the company hit a 52-week high on April 14, driving the index upward. Lee Sang-jun, an analyst at NH Investment & Securities, advises focusing on semiconductor earnings as the market shifts its attention from war to corporate performance. The 2026 KOSPI net profit forecast has jumped to about 592 trillion won, with large-cap semiconductor stocks leading the charge.

• AI Connectivity & AI Energy: As key themes for April, "AI Connectivity" and "AI Energy" are reshaping market leadership, with AI infrastructure and power-related stocks performing well. Power equipment stocks, in particular, led the market alongside semiconductors during the April 14 rebound.

• Defense & Bio: Amid lingering Middle East geopolitical risks, foreign investors have been buying heavily into Samsung SDI, construction, defense, and bio stocks. These sectors are gaining attention as they offer a hedge against geopolitical risk while holding promise for long-term growth.

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Top 10 Promising Stocks for Next Week

1. SK Hynix With its Q1 earnings report imminent, the stock is a key market mover. Having reached a 52-week high on April 14, it remains a bellwether for the memory chip rally and broader market direction.

2. Samsung Electronics Acting as a pillar for KOSPI large-caps, the stock finished higher on April 14. It is a major contributor to the record-breaking KOSPI profit forecast and is poised for revaluation as we enter the Big Tech earnings season.

3. Hanwha Systems The company will hold its Q1 earnings IR session via conference call and webcast on April 27 at 3:30 PM and will re-disclose its corporate value enhancement plan. As a defense sector play, it is expected to attract significant attention before and after the announcement.

4. Woorinet Topped the "Top 10 Highest Returns" list for the 30-day period from March 20 to April 19, 2026, with a gain of +61.99%. The stock has surged due to strong demand for communication network equipment.

5. Mirae Asset Venture Investment Ranked 2nd on the same 30-day performance list with a return of +59.7%, driven by capital inflows into venture and AI investment themes.

6. TMC Ranked 3rd on the same list with a +54.18% return, benefiting from shared themes in technology, supply chains, and policy incentives.

7. OLED & Automotive FPCB Firms (including wireless charging modules) Identified as a promising play for April 2026, with key drivers including "FPCBs for humanoid robots + wireless charging modules," "earnings growth via OLED expansion," and "expansion into automotive, IT, and robotics." 2027 revenue is projected at 704 billion won (+36%), with operating profit expected to jump +119%.

8. Power Equipment Stocks A sector that led the market alongside semiconductors on the April 14 rebound. The AI energy theme continues to fuel long-term growth expectations, with heavy buying from both foreign and institutional investors.

9. Securities Stocks Recorded as a key sector driving the index alongside semiconductors and power equipment during the April 14 rebound. These stocks are expected to benefit from increased trading volume and a return of market liquidity.

10. LG Innotek Confirmed as a target of 10 consecutive days of heavy buying by pension funds. This sustained interest signals long-term supply/demand stability, with the stock gaining attention for its performance momentum in smartphone and automotive components.

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Market Macro Environment & Strategy

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Geopolitical Risks and Macro Factors

The most significant variable for the domestic market this week is the progress of the second round of ceasefire talks between the US and Iran. Between April 14 and 15, the New York market reflected a partial easing of the "war premium" from the Middle East, a moderation in inflation shocks, initial quality checks of the earnings season, and the sustainability of the AI investment cycle.

On April 14, speculation about a potential second US-Iran meeting in Pakistan helped restore risk appetite, leading to a geopolitical risk thaw. The KOSPI climbed +2.74% and the KOSDAQ +2.00% that day, bolstered by strong buying from both foreign and institutional investors.

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KOSPI Band and Strategy

NH Investment & Securities has projected a KOSPI weekly band of 5,700–6,400 for the week of April 20–24. Optimism is running high as the 2026 KOSPI net profit forecast has surged to a record-breaking 592 trillion won.

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Supply/Demand and Strategy Points

• Joint Buying by Foreigners/Institutions: Foreign and institutional investors acted in concert to support the market during the April 14 rebound. Foreigners focused on defense and bio, while pension funds concentrated on specific stocks like LG Innotek.
• Strategy: Analysts suggest preparing for short-term volatility based on the progress of Middle East geopolitical tensions and earnings releases from firms like SK Hynix and Hanwha Systems. Long-term trend-following strategies in AI semiconductors, power equipment, and defense sectors remain valid.
• Exchange Rates: Currency fluctuations amid Middle East tensions are expected to act as an additional variable for the KOSPI's direction.

⚠️ This article is informational content based on publicly available brokerage reports and economic media coverage and does not constitute investment advice. All investment decisions are the sole responsibility of the reader.