Construction and Battery Plays Propel Korean Market Higher

South Korea’s benchmark KOSPI climbed 1.23% to 6,891.84 points, while the tech‑heavy KOSDAQ rose 0.19% to 828.43, reflecting a broadly positive session. The Korean won held steady at 1,383.12 per US dollar, and the market was driven by construction, battery and specialty‑tech stocks posting sizable gains.

DaewooEngineering&Construction (047040) +6.81%

Daewoo Engineering & Construction surged 6.81% as investors priced in a wave of new contracts worth roughly 27 trillion KRW in nuclear and LNG projects, sparking buying pressure [1][4][6]. Analysts sharply lifted the target price from 7,300 KRW to 22,000 KRW, implying a 204% upside and markedly improving sentiment [1][4]. Nevertheless, some market participants warned of “excessive price correction,” noting a modest 0.13% intraday dip on Aug 24 [2][3].

SAMSUNG SDI CO.,LTD. (006400) +7.95%

Samsung SDI jumped 7.95% after Samsung announced the sale of its stake in Samsung Display, prompting expectations that the battery maker will expand its energy‑storage‑system (ESS) production capacity [7][8][9][10]. Even though the electric‑vehicle market remains weak, analysts see growing demand for ESS and AI‑related applications, supporting the rebound [11]. The move was accentuated by Samsung Electronics falling about 6%, making SDI the sole riser and drawing additional investor focus [10].

SIMMTECH Co., Ltd. (222800) +10.56%

SIMMTECH rallied 10.56% on the KOSDAQ after analysts set a new target price of 190,000 KRW, citing the upcoming expansion of its SOCAMM business and the associated growth upside [13]. The company also disclosed a major facility investment of between 270 billion and 274.2 billion KRW, which may dilute equity in the short term but is viewed as a catalyst for mid‑to‑long‑term earnings expansion [16][18]. Market reaction was immediate, with a “sudden surge” noted on Aug 24 and a 2.47% intraday rise on Aug 25 [14][15].

SANIL ELECTRIC (062040) +8.99%

Sanil Electric rose 8.99% as investors priced in stronger demand for power‑equipment, keeping the stock on a steady intraday trajectory [20]. The rally was amplified by reports that Trump’s China power‑equipment ban sparked a broader surge in the sector, lifting Sanil about 10% on the day [21]. Additionally, the company’s entry into the ultra‑high‑voltage transformer market and a forecast of an extra 200 billion KRW in revenue by 2029 further buoyed sentiment [22].

LIGHTRON FIBER-OPTIC DEVICES (069540) +10.54%

Lightron Fiber‑Optic Devices surged 10.54% after Nvidia’s strong earnings lifted the broader semiconductor supply chain, which in turn boosted Lightron’s share price [26]. Investor optimism was reinforced by reports of a large institutional buying spree targeting the stock, adding further momentum [28]. Conversely, a convertible bond conversion announced on Aug 24 would issue 14.19 million new shares, raising concerns about shareholder dilution [27].

Sources

1. “대규모 수주 기대감”…대우건설 목표가 7300원 → 2만2000원 [오늘 나온 보고서] — 매일경제 · 2026-08-25
2. 대우건설 주가, 8월 24일 장중 15,910원 0.13% 하락 — 톱스타뉴스 · 2026-08-24
3. "과도한 주가 조정" 삼성전자, 목표주가 37만원…대우건설, 대규모 신규 수주 자신감 [株토피아] — 파이낸셜뉴스 · 2026-08-26
4. 한화證 "대우건설, 신규수주·주택 개선에 원전·LNG 기대…목표주가 204%↑" — v.daum.net · 2026-08-25
5. [대우건설 주가전망] [긴급] 완벽히 속았네요.. 건설 세력들 대거 검거 완료! 세력들의 금일 전략 완벽분석! 필수시청 -6월22일 방송 Ryan Johnson (q7bsaNJUAU) — Mshale · 2026-08-26
6. 대우건설 주가 8%대 급등…27조 수주 목표·원전·LNG 기대감에 매수세 — 잡포스트 · 2026-08-26
7. 삼성SDI 주가 장중 8%대 올라, 삼성디스플레이 지분 매각에 ESS 생산능력 확대 기대 — 비즈니스포스트 · 2026-08-24
8. [특징주] '삼성D 지분 매각' 삼성SDI, 8%↑…이차전지주도 강세 — 연합뉴스 · 2026-08-24
9. [ET특징주] 삼성SDI, 삼성디스플레이 지분 매각 발표…주가 7%↑ — 전자신문 · 2026-08-24
10. 삼성전자 주가 6% 빠지는데…삼성SDI 나홀로 8% 급등 [종목Pick] — 헤럴드경제 · 2026-08-24
11. 삼성SDI, 주가 반등에 수급 양호...EV 부진 딛고 ESS·AI 수요 확대 — 증권일보 · 2026-08-26
12. 삼성SDI 주가, 8월 25일 장중 514,000원 0.19% 하락 — 톱스타뉴스 · 2026-08-25
13. 목표주가 19만원 심텍, SOCAMM 증설에 승부수 — 중기이코노미 · 2026-08-26
14. 심텍 주가, 갑작스런 급등세... 무슨 회사길래? — 금강일보 · 2026-08-24
15. 심텍 주가, 8월 25일 장중 107,800원 2.47% 상승 — 톱스타뉴스 · 2026-08-25
16. 하나證 “심텍 2700억 시설 투자, 단기적으로 주식가치 희석 불가피” - 조선비즈 — Chosunbiz · 2026-08-25
17. 심텍(222800) — 매일경제 마켓 · 2026-08-24
18. 하나증권 “심텍, 2,742억원 증설…자금조달 부담에도 중장기 성장 유효” — v.daum.net · 2026-08-26
19. 산일전기 주가, 급등세... 이유는? — 금강일보 · 2026-08-27
20. [특징주] 산일전기, 전력설비 투자 기대감에 장중 견조한 흐름 지속 : 기업주식정보 — 재경일보 · 2026-08-26
21. [특징주] 트럼프 中 전력장비 차단에 전력株 '들썩'…산일전기 10% ↑ — 뉴스핌 · 2026-08-27
22. [모닝 리포트] 산일전기, 초고압 변압기 진출…"2029년 매출 2000억 추가" — 뉴스핌 · 2026-08-26
23. 산일전기 투자분석 2026. 08. 24 — 주달 · 2026-08-24
24. [마감분석] 산일전기, 견조한 수급 속 2%대 상승 마감 : 기업주식정보 — 재경일보 · 2026-08-25
25. 빛과전자 주가, 8월 25일 2,730원 2.67% 하락 마감 — 톱스타뉴스 · 2026-08-25
26. 빛과전자 주가, 엔비디아 실적 호조에 급등세 — 금강일보 · 2026-08-27
27. 빛과전자, CB 전환에 3개월간 신주 1419만주…주주가치 희석 우려 — edaily.co.kr · 2026-08-24
28. [대한광통신 주가전망] 거대기관 000만주 매집 관련 긴급대응전략 공유합니다!#대한광통신 #대한광통신 주가전망 #루멘텀 #코히런트 #한국첨단소재 #빛과전자 #엔비디아 #광섬유 Joao Gomes Atletico Madrid Transfer (L2mRcjPvWd) — Mshale · 2026-08-24
29. 빛과전자 주가, 8월 27일 장중 3,135원 10.20% 상승 — 톱스타뉴스 · 2026-08-27

This is market commentary, not investment advice.