Mixed Midday Trading as KOSDAQ Gains and KOSPI Slips on Semiconductor Shifts

The Korean stock market displayed mixed performance at midday, with the benchmark KOSPI declining by 0.73% to 7,000.48, while the tech-heavy KOSDAQ rose 0.27% to 832.59. Meanwhile, the USD/KRW exchange rate hovered at 1,340.86. Investors are closely monitoring semiconductor equipment and materials stocks amid sector rebalancing and individual corporate developments.

JUSUNG ENGINEERING Co.,Ltd. (036930) +12.83%

Jusung Engineering jumped 12.83% on the KOSDAQ. The stock benefited from simultaneous net buying by foreign and institutional investors [3, 5], alongside solid semiconductor order flows [4] and a rising trend in the LED equipment theme [6]. While the company has seen consecutive gains [2] and hit 202,000 KRW on September 8 [1], specific additional drivers behind today's double-digit surge remain unconfirmed.

HANMISemiconductorCO.,Ltd. (042700) +3.79%

Hanmi Semiconductor rose 3.79% on the KOSPI. Positive sentiment was driven by the unveiling of its next-generation packaging equipment [8] and massive treasury stock purchases by Chairman Kwak Dong-shin, who bought a cumulative 70.2 billion KRW in his fourth purchase this year [9]. While the stock experienced intraday drops on September 10 [10, 11], the exact reasons for that decline are unconfirmed.

DB HiTek Co.,LTD (000990) +5.38%

DB HiTek climbed 5.38% on the KOSPI. The advance was propelled by growth expectations in next-generation power semiconductor foundries and rising foundry prices [13, 15]. Additionally, market interest grew following the unveiling of its 'Astra' platform [14], while KB Securities highlighted its undervaluation appeal [18]. Strong support also came from simultaneous net buying by foreign and institutional investors [17].

NEXTEEL (092790) +8.94%

Nexteel surged 8.94% on the KOSPI. The stock gained significant traction after being highlighted in local media as a 'whale stock' to watch for the next trading session [21, 22]. This triggered a sharp intraday rise, activating a volatility interruption (VI) mechanism [20]. However, specific corporate developments or earnings-related catalysts explaining the sudden surge remain unconfirmed [19].

TSE CO.,Ltd (131290) +13.59%

TSE surged 13.59% on the KOSDAQ. The stock was boosted by sector rebalancing demand that favored semiconductor materials, components, and equipment [23]. It also benefited from a positive earnings outlook and a 400,000 KRW target price from Shinhan Securities [25], alongside strength in the LED equipment theme [26]. The precise direct trigger for today's sharp rise remains unconfirmed.

Sources

1. 주성엔지니어링 주가, 9월 8일 장중 202,000원 7.91% 상승 — 톱스타뉴스 · 2026-09-08
2. 주성엔지니어링 주가 10%대 급등…3거래일 연속 상승 — CBC뉴스 · 2026-09-08
3. [장중수급포착] 주성엔지니어링, 외국인/기관 동시 순매수… 주가 +7.40% — 뉴스핌 · 2026-09-09
4. [특징주] 주성엔지니어링(036930), 반도체 수주 탄탄…실적 전환 속도 관건 — 인천일보 · 2026-09-06
5. 07일, 외국인 코스닥에서 주성엔지니어링(+4.99%), HPSP(+4.92%) 등 순매수 — 한국경제 · 2026-09-07
6. 특징주, 주성엔지니어링-LED장비 테마 상승세에 3.52% ↑ — 매일경제 마켓 · 2026-09-07
7. 한미반도체 주가, 9월 9일 장중 248,000원 1.43% 상승 — 톱스타뉴스 · 2026-09-09
8. 한미반도체 주가 4% 상승...차세대 패키징 장비 공개 — gukjenews.com · 2026-09-08
9. 한미반도체 곽동신 회장, 자사주 누적 702억원 매수…올해에만 4번째 — 아주경제 · 2026-09-09
10. 한미반도체 주가, 9월 10일 장중 244,250원 2.50% 하락 — 톱스타뉴스 · 2026-09-10
11. 한미반도체 주가 하락 중 — 아시아뉴스통신 · 2026-09-10
12. 한미반도체 주가, 9월 8일 장중 252,500원 4.99% 상승 — 톱스타뉴스 · 2026-09-08
13. [MK시그널] DB하이텍, 차세대 전력반도체 파운드리 성장 기대감 등에 주가 상승세... MK시그널 추천 후 상승률 12.12% 기록 — 매일경제 마켓 · 2026-09-07
14. [특징주] DB하이텍, '아스트라' 공개 후 수혜 기대.. '급등' — 글로벌이코노믹 · 2026-09-07
15. DB하이텍, 장 초반 10%대 급등…파운드리 가격 상승에 주가↑ - 머니투데이 — 머니투데이 · 2026-09-09
16. DB하이텍 주가, 9월 9일 장중 111,900원 8.22% 상승 — 톱스타뉴스 · 2026-09-09
17. [장중수급포착] DB하이텍, 외국인/기관 동시 순매수… 주가 +10.44% — 뉴스핌 · 2026-09-09
18. [키-리포트] KB "DB하이텍, 저평가 매력 부각…가파른 주가 상승" — 뉴스드림 · 2026-09-07
19. 넥스틸 주가, 급등세... 무슨 회사길래? — 금강일보 · 2026-09-10
20. [속보] 넥스틸 VI 발동 주가 급등흐름 — CBC뉴스 · 2026-09-10
21. [고래사냥] 'DB하이텍·동진쎄미켐·넥스틸! 내일장 고래 종목은?! - 머니투데이 — 머니투데이 · 2026-09-09
22. [고래사냥] 'DB하이텍·동진쎄미켐·넥스틸! 내일장 고래 종목은?! — supple.kr · 2026-09-09
23. 주성엔지·티에스이 10% 급등…리밸런싱 수요에 소부장 강세 — 한국경제 · 2026-09-10
24. 티에스이 주가, 9월 7일 261,500원 10.57% 상승 마감 — 중앙이코노미뉴스 · 2026-09-07
25. [리포트 브리핑]티에스이, '실적 추이 및 전망' 목표가 400,000원 - 신한투자증권 — 뉴스핌 · 2026-09-07
26. 특징주, 티에스이-LED장비 테마 상승세에 6.34% ↑ — 매일경제 · 2026-09-07
27. 티에스이(131290) — 씽크풀 AI · 2026-09-07

This is market commentary, not investment advice.