KOSPI Plunges Over 5% as Select Stocks Rally on Sector Catalysts

The KOSPI closed sharply lower at 6,471.17, down 5.80%, while the KOSDAQ slipped 1.17% to 824.46. Net foreign and institutional selling dominated the KOSPI, yet a handful of stocks posted double‑digit gains on news‑driven buying.

Ananti Inc. (025980) +18.89%

Ananti Inc. chart

Price now₩5,350
Prev close₩4,500
Change+18.89%
Mkt cap₩521B
P/E-12.33
P/B0.7
EPS₩-434
ROE-7.21%
Debt ratio112.66%
52W range₩3,150–10,880

Ananti surged 18.89% after investors linked the stock to heightened expectations of a North‑America summit that could boost inter‑Korean cooperation, lifting related equities [1]. The company was also highlighted as a beneficiary of prospective North‑Korea tourism, drawing focused buying interest [4]. Trading volume exploded, accelerating the rally [6].

HyundaiEngineering&Construction (000720) +5.81%

HyundaiEngineering&Construction chart

Price now₩116,500
Prev close₩110,100
Change+5.81%
Mkt cap₩13.0T
P/E35.09
P/B1.58
EPS₩3,320
ROE4.95%
Debt ratio157.57%
52W range₩54,100–198,400

Analyst consensus — 21 ratings, last 180 days · avg target ₩175,381

Buy20
Hold1
Sell0

Hyundai E&C rose 5.81% on growing optimism ahead of its half‑year earnings, which spurred a buying wave [9]. Anticipation of a U.S. TerraPower small‑modular reactor contract and a partnership with Bill Gates on next‑generation nuclear projects further bolstered sentiment [10][12]. A volatility‑interruption (VI) trigger also activated, prompting a surge of market orders [8].

Micro Contact Solution Co.,Ltd. (098120) +9.66%

Micro Contact Solution Co.,Ltd. chart

Price now₩41,450
Prev close₩37,800
Change+9.66%
Mkt cap₩345B
P/E20.41
P/B4.24
EPS₩2,031
ROE23.12%
Debt ratio21.00%
52W range₩15,500–42,450

Micro Contact Solution jumped 9.66% as foreign investors and institutions simultaneously recorded net purchases, intensifying demand pressure [13]. The broader semiconductor components and materials sector remained strong, and rising demand for test sockets singled out the company as a sector “feature stock,” driving its price higher [14][18].

HD HYUNDAI ENERGY SOLUTIONS CO.,LTD. (322000) +3.85%

HD HYUNDAI ENERGY SOLUTIONS CO.,LTD. chart

Price now₩129,400
Prev close₩124,600
Change+3.85%
Mkt cap₩1.4T
P/E34.78
P/B3.47
EPS₩3,721
ROE16.07%
Debt ratio31.44%
52W range₩41,300–256,000

Analyst consensus — 2 ratings, last 180 days · avg target ₩212,500

Buy2
Hold0
Sell0

HD Hyundai Energy Solutions added 3.85% on sustained net buying from both foreign and institutional investors, reinforcing the upward trend [19][20]. The stock benefited from a perceived tailwind in module and power‑equipment demand, alongside peers such as LS ELECTRIC [21]. Expanding solar generation and ESS (energy‑storage system) projects amplified expectations of explosive growth, further supporting the rally [22].

Doosan Fuel Cell (336260) +9.94%

Doosan Fuel Cell chart

Price now₩39,800
Prev close₩36,200
Change+9.94%
Mkt cap₩2.6T
P/E-24.52
P/B8.86
EPS₩-1,623
ROE-32.18%
Debt ratio270.41%
52W range₩18,230–108,900

Analyst consensus — 6 ratings, last 180 days · avg target ₩62,667

Buy4
Hold2
Sell0

Doosan Fuel Cell surged 9.94% after a large order and an “earning shock” lifted investor confidence, with the company posting a 54% month‑to‑date gain [24][26]. While headlines flagged concerns over potential maximal losses, the impact of that risk could not be quantified from the available reports [28]. Some foreign and institutional selling created a 4% downside pressure, yet the overall momentum remained bullish [29].

Sources

  1. 아난티 주가 장중 16%대 올라, 북미 정상회담 기대감에 남북경협주 강세 — 비즈니스포스트 · 2026-08-19
  2. 아난티 주가, 8월 19일 장중 4,995원 11.00% 상승 — 톱스타뉴스 · 2026-08-19
  3. 아난티 주가, 급등세... 왜? — ggilbo.com · 2026-08-18
  4. [특징주] 아난티, 대북 관광 수혜주 부각… 장 초반 11%대 급등 - 조선비즈 — Chosunbiz · 2026-08-19
  5. [급등주] 아난티, +20.22% 강세 — 전국매일신문 · 2026-08-19
  6. 아난티 18% 급등…남북경협 기대에 거래량 폭발 — 잡포스트 · 2026-08-19
  7. 현대건설 주가 하락 중 — anewsa.com · 2026-08-19
  8. [속보] 현대건설 VI 발동, 주가↑ — CBC뉴스 · 2026-08-19
  9. [특징주] 현대건설, 반기 실적 기대감에 5%대 급등…수급도 동반 유입 : 기업주식정보 — 재경일보 · 2026-08-19
  10. 현대건설, 미 테라파워 SMR 수주 기대…하나證 "원전·데이터센터 유망" — pointe.co.kr · 2026-08-19
  11. 원전 해체주 투심 흔들… 현대건설·비에이치아이는 '함박웃음' — 핀포인트뉴스 · 2026-08-19
  12. 현대건설, 빌 게이츠와 ‘에너지동맹’…차세대원전 최대 8기 짓는다 — 매일경제 · 2026-08-18
  13. [장중수급포착] 마이크로컨텍솔, 외국인/기관 동시 순매수… 주가 +5.16% — 뉴스핌 · 2026-08-19
  14. 마이크로컨텍솔 주가 상한가 기염…반도체 재료·부품주 릴레이 불기둥 — 핀포인트뉴스 · 2026-08-18
  15. 마이크로컨텍솔 주가, 상한가... 왜? — ggilbo.com · 2026-08-18
  16. [특징주]마이크로컨텍솔, 상한가 터치하며 3만 7천 원선 돌파 — 남도일보 · 2026-08-18
  17. [상한가 종목] 삼성공조-STX그린로지스 이어 마이크로컨텍솔-케스피온 등 마감 — 이코노뉴스 · 2026-08-18
  18. [특징주] 마이크로컨텍솔, 반도체 부품株 강세 속 상한가 직행…테스트 소켓 수요 부각 — 와이드경제 · 2026-08-18
  19. [장중수급포착] HD현대에너지솔루션, 외국인/기관 동시 순매수… 주가 +8.43% — 뉴스핌 · 2026-08-19
  20. [장중수급포착] HD현대에너지솔루션, 외국인 6일 연속 순매수행진... 주가 +8.35% — 뉴스핌 · 2026-08-19
  21. HD현대에너지솔루션·LS ELECTRIC 주가 방긋... 모듈 및 전력기기 수혜 부각 — 핀포인트뉴스 · 2026-08-18
  22. 글로벌 신재생 시장 접수하나... HD현대에너지솔루션, 태양광 발전 확대와 ESS 공급 확대로 폭발적 성장 — 핀포인트뉴스 · 2026-08-19
  23. HD현대에너지솔루션 투자분석 2026. 08. 18 — judal.co.kr · 2026-08-18
  24. ‘어닝 쇼크’ 덮은 ‘수주 효과’…두산퓨얼셀 이달 54% 뛰었다 [종목 돋보기] — 서울경제 · 2026-08-17
  25. 두산퓨얼셀, 4거래일 질주 뒤 숨고르기…수주 확대 기대감은 계속 — CBC뉴스 · 2026-08-17
  26. [특징주] 두산퓨얼셀, 수소 경제 기대감에 장중 강세 : 기업주식정보 — 재경일보 · 2026-08-19
  27. 두산퓨얼셀 주가, 8월 19일 39,800원 9.94% 상승 마감 — 톱스타뉴스 · 2026-08-19
  28. 두산퓨얼셀 ‘최대 수주’ 이면에 도사린 ‘최대 적자’ — 한국금융신문 · 2026-08-17
  29. 두산퓨얼셀, 외국인·기관 매도에 4%대 하락 마감 : 기업주식정보 — 재경일보 · 2026-08-18

This is market commentary, not investment advice.