KOSPI Surges Over 4.6% as Tech and Energy Shares Rally

The Korean stock market experienced a powerful rally today, with the benchmark KOSPI surging 4.61% to close at 6,995.39, while the tech-heavy KOSDAQ rose 1.07% to 822.19. Institutional and foreign investors heavily backed the KOSPI with net purchases of KRW 2,649,696 million and KRW 2,552,493 million, respectively, offsetting net selling in the KOSDAQ. The USD/KRW exchange rate closed at 1,349.84.

SK hynix (000660) +8.26%

SK hynix chart

Price now₩1,783,000
Prev close₩1,647,000
Change+8.26%
Mkt cap₩1,302.5T
P/E30.24
P/B10.38
EPS₩58,955
ROE92.68%
Debt ratio32.80%
52W range₩274,000–2,987,000

Analyst consensus — 22 ratings, last 180 days · avg target ₩3,306,818

Buy22
Hold0
Sell0

SK hynix surged 8.26% today, driven by positive momentum in US semiconductor stocks and a general rally among memory chipmakers [1], [3]. Upward revisions for the company's third-quarter earnings outlook further boosted investor sentiment [6]. While upcoming events [2] and Solidigm's potential double-listing [4] remain key variables for future price movements, their direct impact on today's rise is unconfirmed.

Sky Labs Inc. (386380) +30.00%

Price now₩30,550
Prev close₩23,500
Change+30.00%
Mkt cap₩573B
P/E0
P/B0
EPS—
ROE—
Debt ratio—
52W range₩8,200–30,550

Newly listed medical device manufacturer Sky Labs surged 30.00% to hit the daily limit. The stock has shown high volatility since its recent KOSDAQ debut [7], [8], [9], [10], [12]. Positive momentum was also driven by the company sharing clinical trial results for its 'CART' ring-type blood pressure monitor [11]. However, the exact driver behind today's maximum limit-up remains unconfirmed by the headlines.

SKSQUARE (402340) +8.07%

SKSQUARE chart

Price now₩1,125,000
Prev close₩1,041,000
Change+8.07%
Mkt cap₩148.4T
P/E16.93
P/B5.37
EPS₩66,468
ROE85.62%
Debt ratio6.62%
52W range₩151,400–2,189,000

Analyst consensus — 6 ratings, last 180 days · avg target ₩1,880,000

Buy6
Hold0
Sell0

SKSQUARE rose 8.07%, moving in tandem with SK hynix, as both stocks often experience synchronized surges and corrections [13]. Although the stock recently faced downward pressure and target price downgrades due to intensifying competition in the High Bandwidth Memory (HBM) market [14], it rebounded during trading on September 7 [15]. The specific catalyst for today's 8.07% jump is unconfirmed [15], [16].

DOOSAN ENERBILITY (034020) +10.98%

DOOSAN ENERBILITY chart

Price now₩87,900
Prev close₩79,200
Change+10.98%
Mkt cap₩56.3T
P/E665.91
P/B7.23
EPS₩132
ROE2.30%
Debt ratio136.43%
52W range₩57,000–139,200

Analyst consensus — 15 ratings, last 180 days · avg target ₩127,000

Buy15
Hold0
Sell0

DOOSAN ENERBILITY climbed 10.98% today, supported by sustained expectations for nuclear power plant and Small Modular Reactor (SMR) orders [21]. While the market has focused on three key variables surrounding the company's stock [17], the specific details of these variables and the exact drivers behind today's double-digit gain remain unconfirmed by the available headlines.

Doosan Fuel Cell (336260) +13.80%

Doosan Fuel Cell chart

Price now₩49,900
Prev close₩43,850
Change+13.80%
Mkt cap₩3.3T
P/E-30.75
P/B11.11
EPS₩-1,623
ROE-48.11%
Debt ratio345.88%
52W range₩18,230–108,900

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

Buy4
Hold2
Sell0

Doosan Fuel Cell jumped 13.80% following news of a massive KRW 501.4 billion contract to supply phosphoric acid fuel cells (PAFC) for US data centers [23], [24], [25], [28]. This follows a previous announcement on September 4 regarding an KRW 80.3 billion maintenance and service contract [26]. The landmark US deal has ignited strong investor interest in its fuel cell business.

Sources

  1. SK하이닉스 ADR 상장 시초가 '170달러' 회복…메모리 반도체 기업 강세 — 연합인포맥스 · 2026-09-04
  2. 다시 꿈틀대는 SK하이닉스 주가…향후 핵심 이벤트 6가지 — 한국경제 · 2026-09-04
  3. SK하이닉스 주가 장중 5%대 올라, 미국 반도체주 훈풍에 삼성전자도 강세 — 비즈니스포스트 · 2026-09-07
  4. SK하이닉스 '솔리다임 중복상장' D-Day … 주가 향방에 '촉각' — 뉴데일리 · 2026-09-04
  5. SK하이닉스 주가, 급등세... 왜? — 금강일보 · 2026-09-07
  6. 삼성전자·SK하이닉스 3분기 실적 전망 상향…주가도 동반 반등 — v.daum.net · 2026-09-07
  7. [주식] 스카이랩스, 코스닥 입성 첫 날 135% '급등' — 히트뉴스 · 2026-09-04
  8. [특징주] '반지 혈압계' 스카이랩스, 코스닥 상장 첫날 16%대 '상승' — 글로벌이코노믹 · 2026-09-04
  9. [ET특징주] '반지형 혈압계' 스카이랩스, 코스닥 입성 첫날 140%↑ — 전자신문 · 2026-09-04
  10. 스카이랩스, 오늘 코스닥 입성…오전 주가 강세 — 데일리메디 · 2026-09-04
  11. 스카이랩스 주가 19% 급등...CART 혈압계 임상성과 공유 — gukjenews.com · 2026-09-07
  12. [속보] 스카이랩스, 코스닥 상장 주가 16%↓…의료용 기기 제조업체 — CBC뉴스 · 2026-09-05
  13. 210만원→100만원대…닉스·SK스퀘어 주가, 폭등 뒤 폭락 ‘한몸’ — v.daum.net · 2026-09-06
  14. HBM 경쟁 격화, SK스퀘어 주가 급락…증권가 목표가 줄하향 — 내외뉴스통신 · 2026-09-07
  15. SK스퀘어 주가, 9월 7일 장중 1,089,000원 4.61% 상승 — 톱스타뉴스 · 2026-09-07
  16. SK스퀘어(402340) — 매일경제 마켓 · 2026-09-03
  17. 두산에너빌리티 주가 둘러싼 '세가지 변수' [B급기자의 B급리포트] — v.daum.net · 2026-09-04
  18. 두산에너빌리티 주가, 9월 4일 장중 79,400원 0.25% 상승 — 톱스타뉴스 · 2026-09-04
  19. 두산에너빌리티 주가 장중 강보합…8만원선 놓고 공방 — CBC뉴스 · 2026-09-04
  20. 두산에너빌리티 주가 상승 중 — 아시아뉴스통신 · 2026-09-07
  21. 두산에너빌리티 8만원 돌파 후 숨 고르기…원전·SMR 수주 기대는 ‘여전’ — 잡포스트 · 2026-09-04
  22. 두산에너빌리티, 장중 ‘8만빌리티’ 회복…다음장 흐름 주목 — CBC뉴스 · 2026-09-05
  23. [특징주] 두산퓨얼셀, 美 데이터센터용 연료전지 공급…19%대 급등 — 에너지경제신문 · 2026-09-07
  24. [특징주] 두산퓨얼셀, 美 5014억원 수주.. 24%대 '급등' — 글로벌이코노믹 · 2026-09-07
  25. [특징주] 두산퓨얼셀, 5014억원 규모 美데이터센터 연료전지 수주 소식에…급등 - 조선비즈 — Chosunbiz · 2026-09-07
  26. [공시 Pick] 두산퓨얼셀 803억 유지보수계약 공개…주가 3% 넘게 급등 — 뉴스투데이 · 2026-09-04
  27. 두산퓨얼셀 주가, 9월 4일 장중 39,750원 1.92% 상승 — 톱스타뉴스 · 2026-09-04
  28. [뉴스락 주식네비] 두산퓨얼셀, 美 데이터센터 뚫었다... PAFC 수주 본격화 — 뉴스락 · 2026-09-07

This is market commentary, not investment advice.