KOSPI jumps over 2% as semiconductor and shipping stocks lead gains

South Korea’s benchmark KOSPI surged 2.31% to 7,139.42 points, while the KOSDAQ added 0.5% to 868.97. The Korean won traded at 1,415.10 per US dollar, and the market displayed a broadly upbeat tone driven by semiconductor, shipping and specialty chemicals stocks.

SK hynix (000660) +6.44%

SK hynix (000660) jumped 6.44% to 7,139.42 points despite a lack of clear catalyst in the headlines. While the surge was noted, analysts at NH Securities had recently cut their target price, reflecting a prior decline [2][3]. Additionally, a controversy over a subsidiary’s dual‑listing caused the stock to halve in value earlier this week [4]. The rapid rise therefore appears driven by market speculation rather than concrete news, as the headline alone does not explain the move [1].

FOOSUNG CO.,LTD (093370) +11.05%

FOOSUNG Co., Ltd. (093370) surged 11.05% after an early‑session “VI activation” event sparked buying pressure, a mechanism described as a direct catalyst for the jump [8]. The company also reported a 122.8% year‑on‑year increase in first‑half operating profit, driven by strong growth in its semiconductor gas and refrigerant segments, leading to a Q2 earnings surprise that further lifted sentiment [9][10]. These fundamentals together explain the pronounced upward move.

HMM (011200) +7.06%

HMM (011200) climbed 7.06% as securities houses upgraded its 3Q earnings outlook, raising target prices up to 30,000 KRW and fueling investor optimism [12]. The rally was reinforced on August 18 by news that a proposed US‑Iran cease‑fire extension fell through, reviving expectations for shipping demand and pushing the stock up by over 6% [14]. While some analysts issued cautionary notes, the headline‑driven factors clearly underpin the day's gain.

ISUPETASYS (007660) +9.83%

ISUPETASYS (007660) rose 9.83% following a strong Q2 performance, with sales jumping 57% year‑on‑year to 379.9 billion KRW, a result that lifted investor expectations and drove the price higher [20][19]. Although the stock slipped 1.24% on August 14 after the earnings release, the overall upward momentum suggests that the market is absorbing the earnings news and moving beyond the short‑term profit‑taking observed earlier [18]. The robust sales growth thus appears to be the main driver of the recent rally.

Ananti Inc. (025980) +22.66%

Ananti Inc. (025980) surged 22.66% despite a lack of recent news articles or analyst commentary that could clarify the catalyst. The company’s financial snapshot shows a negative P/E of –11.16, a low price‑to‑book ratio of 0.63, and a ROE of –7.21%, indicating weak profitability, while debt stands at 112.66% of equity. Such fundamentals make the sharp gain unusual, and without verifiable headlines the driver of the rally cannot be confirmed.

Sources

1. SK하이닉스 주가, 오늘 왜 급등했나? — Investing.com 한국어 · 2026-08-17
2. "SK하이닉스 주가 하락 반영" SK스퀘어 목표주가↓-NH - 머니투데이 — mt.co.kr · 2026-08-17
3. NH證 SK스퀘어, SK하이닉스 주가 조정 반영…목표가↓ — 아주경제 · 2026-08-17
4. '주가 반토막' SK하이닉스, 손자회사 중복상장 '시끌' — 아이뉴스24 · 2026-08-14
5. "보너스 쏟아부었는데…" SK하이닉스 투자한 직장인 '피눈물' — 한국경제 · 2026-08-14
6. 후성 주가, 8월 14일 12,400원 3.68% 상승 마감 — 톱스타뉴스 · 2026-08-14
7. 후성 주가, 급등세... 왜? — 금강일보 · 2026-08-18
8. [속보] 후성 VI 발동, 주가 장초반↑ — CBC뉴스 · 2026-08-18
9. [특징주] 후성, 상반기 영업익 122.8% 급증…현금흐름은 적자 전환 — 뉴스티앤티 · 2026-08-17
10. [모닝 리포트] "후성, 반도체 가스·냉매 성장에 2분기 '어닝 서프라이즈'" — 뉴스핌 · 2026-08-18
11. 후성 투자분석 2026. 08. 14 — 주달 · 2026-08-14
12. [모닝 리포트] HMM, 3분기 실적 반등 온다…증권가 목표가 최대 3만원 — 뉴스핌 · 2026-08-14
13. HMM주가 상승 중 — 아시아뉴스통신 · 2026-08-18
14. [특징주] HMM, 美-이란 휴전 연장 불발 소식에 6%대↑ — 아이뉴스24 · 2026-08-18
15. HMM (011200) — 씽크풀 AI · 2026-08-14
16. '트럼프 수혜주' HMM 더 갈까…증권가서 나온 뜻밖의 경고 [종목+] — 한국경제 · 2026-08-17
17. HMM, 3분기 ‘성수기 특수’ 예상되지만… iM증권, 투자의견 ‘중립’ 하향 — 한양경제 · 2026-08-15
18. 이수페타시스 주가, 8월 14일 95,600원 1.24% 하락 마감 — 톱스타뉴스 · 2026-08-14
19. 이수페타시스 주가 상승 중 — 아시아뉴스통신 · 2026-08-18
20. [실적속보]이수페타시스, 올해 2Q 매출액 급증 3799억원... 전년동기比 57%↑ (연결) — 씽크풀 AI · 2026-08-14

This is market commentary, not investment advice.