Korean Markets Rally as Energy and Infrastructure Stocks Lead Gains

The South Korean stock market opened strong during the morning session, with the benchmark KOSPI rising 1.31% to 7,045.82 and the tech-heavy KOSDAQ surging 2.15% to 829.37. Investor sentiment was buoyed by robust sector-specific developments, while the USD/KRW exchange rate hovered at 1,345.38.

Woori Technology, Incorporation (032820) +19.98%

Woori Technology jumped 19.98% during the morning session, driven primarily by a broad rally in the nuclear power sector [4]. The stock gained attention as a volatile nuclear and defense play amid lingering concerns over a prolonged conflict between the US and Iran [5]. On September 8, the stock saw its volatility halt (VI) activated as it surged over 12% [2], following an 8.33% intraday rise to 11,830 KRW [1]. Any internal company developments or contracts contributing to the rise remain unconfirmed.

Doosan Fuel Cell (336260) +19.19%

Doosan Fuel Cell surged 19.19% following a massive 501.4 billion KRW contract to supply fuel cells for US data centers, marking a major breakthrough in the US market [7, 8, 9, 10]. This landmark deal prompted securities firms to upgrade their investment ratings to "Buy" and raise target prices [6, 7]. The stock climbed to 50,550 KRW on September 8 [11]. Specific details regarding the counterparty and contract terms remain unconfirmed.

RF Materials (327260) +22.90%

RF Materials surged 22.90% in the KOSDAQ market, propelled by the company's official regulatory filing announcing a decision to cancel its treasury shares [12]. Treasury share cancellations are typically viewed positively by the market as they increase shareholder value. No other specific drivers or corporate developments were confirmed in the provided disclosures to explain the sharp upward movement.

SUNGHO ELECTRONICS CORP. (043260) +14.83%

Sungho Electronics rose 14.83% during the morning session, supported by simultaneous net buying from both foreign and institutional investors [13]. The stock also benefited from a general upward trend in the optical communication theme, including optical cables and fibers [14]. On September 8, the stock traded at 17,040 KRW, up 7.37% intraday [15]. Additional specific factors behind the sharp price increase remain unconfirmed.

GAONCABLE (000500) +13.19%

Gaon Cable advanced 13.19% on strong expectations of benefiting from US power grid policies and investments [18, 19]. Market optimism surrounding the construction of power grids for AI data centers further fueled the rally, pushing the stock near 250,000 KRW intraday on September 7 [19, 21]. The upward momentum was also backed by simultaneous net buying from foreign and institutional investors [16].

Sources

1. 우리기술 주가, 9월 8일 장중 11,830원 8.33% 상승 — 톱스타뉴스 · 2026-09-08
2. [속보] 우리기술 VI 발동, 주가 도약…12%↑ — CBC뉴스 · 2026-09-08
3. 우리기술 주가, 9월 7일 장중 10,780원 1.41% 상승 — 톱스타뉴스 · 2026-09-07
4. 특징주, 우리기술-원자력발전 테마 상승세에 14.01% ↑ — 매일경제 · 2026-09-08
5. 우리기술 1.24% 상승 마감…미국 이란 전쟁 장기화 속 원전 방산주 변동성 주시 — CBC뉴스 · 2026-09-06
6. 두산퓨얼셀 주가 장중 22%대 급등, 증권가 투자의견 매수로 상향 조정 — 비즈니스포스트 · 2026-09-07
7. 연료전지 본고장 미국 뚫었다…두산퓨얼셀, 목표주가 줄상향에 날개 — 한국경제 · 2026-09-07
8. [특징주] 두산퓨얼셀, 美 데이터센터용 연료전지 공급…19%대 급등 — 에너지경제신문 · 2026-09-07
9. [특징주] 두산퓨얼셀, 美 5014억원 수주.. 24%대 '급등' — 글로벌이코노믹 · 2026-09-07
10. [특징주] 두산퓨얼셀, 5014억원 규모 美데이터센터 연료전지 수주 소식에…급등 - 조선비즈 — Chosunbiz · 2026-09-07
11. 두산퓨얼셀 주가, 9월 8일 장중 50,550원 1.30% 상승 — 톱스타뉴스 · 2026-09-08
12. [공시 Pick] RF머트리얼즈, 자기주식 소각 결정에 상승세 — 뉴스투데이 · 2026-09-08
13. [장중수급포착] 성호전자, 외국인/기관 동시 순매수… 주가 +7.62% — 뉴스핌 · 2026-09-08
14. 특징주, 성호전자-광통신(광케이블/광섬유 등) 테마 상승세에 5.73% ↑ — 매일경제 마켓 · 2026-09-08
15. 성호전자 주가, 9월 8일 장중 17,040원 7.37% 상승 — 톱스타뉴스 · 2026-09-08
16. [장중수급포착] 가온전선, 외국인/기관 동시 순매수… 주가 +11.32% — 뉴스핌 · 2026-09-07
17. 가온전선 주가, 급등세... 왜? — 금강일보 · 2026-09-07
18. [특징주] 가온전선, 美 전력망 정책 수혜 기대에 10%대 상승 마감 — ebn.co.kr · 2026-09-07
19. [특징주] AI 데이터센터·美 전력망 투자 기대…가온전선 8%대 강세 — v.daum.net · 2026-09-07
20. [속보] 가온전선 VI 발동, 주가 도약 — CBC뉴스 · 2026-09-07
21. 가온전선 장중 25만원 육박, 10%대 급등…AI 데이터센터 전력망 기대 ‘후끈’ — 잡포스트 · 2026-09-07

This is market commentary, not investment advice.