KOSPI and KOSDAQ Surge as Battery and Energy Stocks Rally

South Korean markets finished sharply higher on September 9, 2026, with the benchmark KOSPI rising 1.40% to close at 7,051.64 and the tech-heavy KOSDAQ jumping 2.28% to 830.37. Foreign investors were net buyers on the KOSDAQ with KRW 225,308 million, while institutional investors led the KOSPI with net purchases of KRW 942,233 million. The USD/KRW exchange rate settled at 1,345.38.

Woori Technology, Incorporation (032820) +21.25%

Expectations surrounding the construction of eight large-scale nuclear power plants in the United States drove market interest [3][4]. This momentum triggered a volatility interruption (VI) during trading on September 8 and sustained a two-day consecutive intraday surge through September 9 [1][5][6]. The stock rose by 16.00% to reach 13,700 KRW during trading on September 9 [1]. While the nuclear power plant expectations were the primary catalyst, further specific reasons for the sharp rally remain unconfirmed from the available headlines [2].

SAMSUNG SDI CO.,LTD. (006400) +8.30%

Shares surged as expectations grew that the company's earnings have bottomed out, prompting analysts to raise target prices up to 1 million KRW and pushing the stock to a new 52-week high [8]. Market optimism was also fueled by strong expectations for its Energy Storage System (ESS) business [10]. Additionally, Samsung Life Insurance's special account reportedly swept up 16% of Samsung SDI's outstanding shares as the company secures investment resources [12]. The stock rose 6.04% to 562,000 KRW during trading on September 9 [11].

SK Innovation (096770) +11.23%

The stock gained upward momentum following news of an Energy Storage System (ESS) contract secured by its subsidiary, SK On [13]. Investors also reacted to the company's progress in navigating challenges related to its merger with SKIET, which had previously faced hurdles such as the Financial Supervisory Service's request to revise its registration statement and concerns over shareholder protection [13][17][18]. However, the specific catalyst behind the dramatic 11.23% surge on September 9 remains unconfirmed beyond these factors [14][15].

Sammi Metal Products Co., Ltd. (012210) +29.91%

The stock locked in a limit-up gain of 29.91% to close at 13,030 KRW on September 9 [19]. While the exact corporate disclosures or business developments driving this surge remain unconfirmed from available headlines, the stock has shown highly volatile trading. It previously hit a limit-up ceiling on September 7, rising 22.16% after triggering two volatility interruptions (VI) [20][21]. After a minor correction on September 8 [22][23], it triggered two more VIs on September 9 before hitting the upper limit in the afternoon session [24].

GAONCABLE (000500) +16.70%

Shares jumped as the company secured its first-ever export contract for Canada's public power grid, marking a significant entry into the North American public market [27][30]. Investor sentiment was further boosted by policy benefits and investment expectations surrounding AI data centers and U.S. power grid expansions [28][29]. This positive outlook triggered strong buying pressure, with foreign and institutional investors simultaneously net-purchasing the stock, driving an intraday gain of 16.48% on September 9 [25][30].

Sources

1. 우리기술 주가, 9월 9일 장중 13,700원 16.00% 상승 — 톱스타뉴스 · 2026-09-09
2. 우리기술 주가, 급등세... 왜? — 금강일보 · 2026-09-09
3. 우리기술 주가 16% 급등...美 8기 대형원전 건설 '주목' — gukjenews.com · 2026-09-09
4. 우리기술, 美 원전 8기 건설 기대감에 9%대 강세[특징주] — v.daum.net · 2026-09-09
5. [속보] 우리기술 VI 발동, 주가 도약…12%↑ — CBC뉴스 · 2026-09-08
6. 우리기술 주가, 9월 8일 장중 11,830원 8.33% 상승 — 톱스타뉴스 · 2026-09-08
7. AI주식상승확률분석 : 삼성SDI (006400) 주가 전망과 상승확률 분석 — Investing.com 한국어 · 2026-09-07
8. 삼성SDI, ‘실적 저점 통과 기대’ 52주 신고가…목표가 줄상향 ‘100만원’까지 — 쿠키뉴스 · 2026-09-06
9. 삼성SDI 주가 상승 중 — 아시아뉴스통신 · 2026-09-07
10. 삼성SDI 54만원선까지 밀렸다…‘ESS 기대’에도 장중 1%대 약세 — 잡포스트 · 2026-09-07
11. 삼성SDI 주가, 9월 9일 장중 562,000원 6.04% 상승 — 중앙이코노미뉴스 · 2026-09-09
12. 삼성SDI 투자 재원 확보 속 삼성생명 특별계정, 보유주식 16% ‘싹쓸이’ — 경인방송 뉴스 · 2026-09-08
13. [종목 포커스] SK이노베이션, SKIET 합병 딛고 SK온 ESS 계약으로 주가 탄력? — 데일리인베스트 · 2026-09-06
14. SK이노베이션 주가 도약…15만원선 도달 여부 촉각 — CBC뉴스 · 2026-09-09
15. SK이노베이션 주가, 9월 9일 장중 138,700원 0.51% 상승 — 톱스타뉴스 · 2026-09-09
16. SK이노베이션 주가, 9월 8일 장중 138,800원 0.65% 상승 — 톱스타뉴스 · 2026-09-08
17. SK이노베이션·SKIET 합병 ‘제동’…금감원, 증권신고서 정정 요구 — 부산일보 · 2026-09-06
18. SK이노베이션, SKIET 재흡수 합병, 주주보호의 새 기준을 묻다 — ESG경제 · 2026-09-07
19. 삼미금속 주가, 9월 9일 13,030원 29.91% 상승 마감 — 톱스타뉴스 · 2026-09-09
20. [속보] 삼미금속 VI 두차례 발동, 주가 급등 — CBC뉴스 · 2026-09-07
21. 삼미금속 주가, 9월 7일 장중 상한가, 10,200원 22.16% 상승 마감 — 중앙이코노미뉴스 · 2026-09-07
22. 삼미금속 주가, 9월 8일 장중 10,190원 0.10% 하락 — 톱스타뉴스 · 2026-09-08
23. 삼미금속 주가, 9월 8일 장중 10,070원 1.27% 하락 — 중앙이코노미뉴스 · 2026-09-08
24. [속보] 삼미금속 오후장 상한가 도달…앞서 VI 두차례 발동되기도 — CBC뉴스 · 2026-09-09
25. [장중수급포착] 가온전선, 외국인/기관 동시 순매수… 주가 +16.48% — 뉴스핌 · 2026-09-09
26. 가온전선 주가, 급등세... 왜? — 금강일보 · 2026-09-07
27. 가온전선, 캐나다 공공 전력망 첫 진출 소식에 주가 급등 — 2news.co.kr · 2026-09-09
28. [특징주] 가온전선, 美 전력망 정책 수혜 기대에 10%대 상승 마감 — ebn.co.kr · 2026-09-07
29. [특징주] AI 데이터센터·美 전력망 투자 기대…가온전선 8%대 강세 — v.daum.net · 2026-09-07
30. [특징주]가온전선, 캐나다 전력망 첫 수출에 16.48% 뛰어…북미 공공 시장 진출 부각 — 남도일보 · 2026-09-09

This is market commentary, not investment advice.