KOSPI Plunges Over 5% at Midday as Selected Sectors Defy Market Downturn

The Korean stock market experienced a sharp downturn by midday, with the benchmark KOSPI plunging 5.66% to 6,481.09, while the tech-heavy KOSDAQ fell a milder 0.33% to 831.45. The Korean Won weakened against the greenback, trading at 1,414.42 USD/KRW. Despite the broader market sell-off, select stocks in tourism, technology, construction, and renewable energy managed to post gains on specific domestic and global catalysts.

Ananti Inc. (025980) +24.22%

Ananti Inc. surged 24.22% during midday trading. The sharp rise was primarily driven by growing anticipation surrounding a potential North Korea-US summit, which boosted investor sentiment for inter-Korean economic cooperation shares [1]. Additionally, expectations that Ananti will benefit as a North Korean tourism play further stimulated market interest [4]. This upward momentum was strongly supported by net buying from both foreign and institutional investors [6]. Other potential drivers, such as earnings or policy changes, remain unconfirmed from the available headlines.

ISUPETASYS (007660) +3.40%

ISUPETASYS rose 3.40% following strengthened positive forecasts from major brokerages. Kiwom Securities raised its target price to 190,000 KRW, noting that previous concerns holding back the stock have been cleared [7]. Furthermore, expectations remain high as the company expands its production capacity to meet surging AI demand, restarting its high-earnings momentum [9]. Although Meritz Securities lowered its target price due to weakness in global peers, it upgraded its profit estimates, which served as a positive catalyst for buyers [10].

GS Engineering & Construction Corp (006360) +3.51%

GS Engineering & Construction Corp gained 3.51% as the company secured a 10 trillion KRW pipeline for AI data centers and expanded its overseas nuclear power business [14][18]. Analysts highlighted the company's strong positioning across "housing, data centers, and nuclear power," leading to target price upgrades and heavy institutional buying [15][17]. Additionally, positive expectations surrounding its upcoming half-year report provided a short-term boost during the session [16].

HD HYUNDAI ENERGY SOLUTIONS CO.,LTD. (322000) +7.22%

HD Hyundai Energy Solutions advanced 7.22% amid strong buying pressure. The stock's rally was fueled by simultaneous net purchases from both foreign and institutional investors, with foreign investors logging six consecutive days of net buying [19][21]. Investor sentiment was further bolstered by the company's projected benefits in the solar module and power equipment sectors [20]. Other specific drivers outside of these factors remain unconfirmed.

OCI Holdings Company Ltd. (010060) +3.49%

OCI Holdings climbed 3.49%, recovering from a 2% decline in the previous session that was triggered by half-year report concerns and supply-demand instability [25]. The rebound was driven by renewed expectations for its half-year earnings and the growth potential of its new business engines [24]. Specific details regarding the nature of these new businesses or the exact causes of the previous supply-demand instability cannot be verified from the available headlines.

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? — 금강일보 · 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. [특징주] 외국인·기관, 아난티·실리콘투 '사자'… 삼성전자·한국전력은 매도 우위 — 뉴스티앤티 · 2026-08-19
7. 키움證, “이수페타시스, 주가 발목 잡던 우려 털어내⋯목표가 19만원” — 이투데이 · 2026-08-18
8. 이수페타시스 주가 7,300원 상승후 장마감 — anewsa.com · 2026-08-18
9. [버핏 리포트] 이수페타시스, AI 수요에 '생산능력'까지 키운다...실적 고공행진 '재시동' - 메리츠 — 버핏연구소 · 2026-08-18
10. 메리츠證 "이수페타시스, 이익 추정치 상향…글로벌 피어 약세에 목표가는 하향" — 파이낸셜뉴스 · 2026-08-19
11. 이수페타시스 주가, 8월 18일 장중 104,500원 9.31% 상승 — 톱스타뉴스 · 2026-08-18
12. 이수페타시스 주가 상승 중 — anewsa.com · 2026-08-19
13. GS건설 주가 하락 중 — anewsa.com · 2026-08-19
14. GS건설, AI 데이터센터 '10조 수주' 파이프라인 확보…해외 신규 원전 확장까지 '겹호재' — 프라임경제 · 2026-08-17
15. [GS건설 주가전망]GS건설 2만 원 찍고 +70% 폭등! 기관이 사상 최대 물량 쓸어담는 3가지 이유 Don Mattingly (ENXleiVGqI) — Mshale · 2026-08-16
16. GS건설, 반기보고서 기대감 속 장중 2%대 강세 : 기업주식정보 — 재경일보 · 2026-08-19
17. "주택·데이터센터·원전 삼박자 갖춘 GS건설, 목표가 상향"[클릭 e종목] — v.daum.net · 2026-08-18
18. [키-리포트] 대신 "GS건설, 데이터센터 사업 확대…성장동력 확보" — newsdream.kr · 2026-08-18
19. [장중수급포착] HD현대에너지솔루션, 외국인/기관 동시 순매수… 주가 +8.43% — 뉴스핌 · 2026-08-19
20. HD현대에너지솔루션·LS ELECTRIC 주가 방긋... 모듈 및 전력기기 수혜 부각 — 핀포인트뉴스 · 2026-08-18
21. [장중수급포착] HD현대에너지솔루션, 외국인 6일 연속 순매수행진... 주가 +8.35% — 뉴스핌 · 2026-08-19
22. HD현대에너지솔루션 투자분석 2026. 08. 18 — 주달 · 2026-08-18
23. OCI홀딩스 주가, 8월 19일 장중 286,000원 4.95% 상승 — 톱스타뉴스 · 2026-08-19
24. OCI홀딩스, 반기 실적 기대감에 상승세...신사업 성장 동력 주목 : 기업주식정보 — 재경일보 · 2026-08-19
25. OCI홀딩스, 반기보고서·수급 불안에 2%대 하락 마감 : 기업주식정보 — 재경일보 · 2026-08-18

This is market commentary, not investment advice.