AI Substrate and Export Gains Propel Select Korean Stocks Amid Broad Market Pullback

The KOSPI slipped 1.14% to 6,898.47 and the KOSDAQ fell 2.24% to 845.31, reflecting a cautious tone across the market. Despite the downward bias, a handful of companies posted strong gains driven by sector‑specific catalysts and upbeat earnings expectations.

ISUPETASYS (007660) +7.43%

ISUPETASYS surged 7.43% as its second‑quarter sales jumped 57% year‑on‑year to KRW 379.9 billion, sparking optimism about earnings momentum [3]. At the same time, a sharp rise in demand for AI substrates pushed the share price above the KRW 100,000 level, drawing heightened investor interest [4]. Intraday reports on August 18 noted the stock trading at KRW 104,500 and later at KRW 106,900, confirming the bullish trend [5][6].

SamyangFoods (003230) +6.06%

SamyangFoods rose 6.06% on growing expectations for its "bul‑dak" (spicy chicken) ramen exports, which analysts say could boost overseas sales [7][8]. The company also posted record Q2 results, with global red‑chicken ramen growth cited as a key driver of the recovery [11][12]. In addition, a relatively low price‑to‑earnings multiple of around 12 times was highlighted by securities firms as evidence that the stock remains undervalued, further supporting the price lift [12].

Ananti Inc. (025980) +27.85%

Ananti Inc. jumped 27.85% after a sharp intraday rally that lifted the share to KRW 4,825, a 22.15% increase on August 18 [14]. While the price action itself attracted attention, the headlines do not disclose a specific catalyst, and the underlying reason for the surge remains unconfirmed [13]. Consequently, the move appears driven by speculative buying rather than a disclosed fundamental development.

Micro Contact Solution Co.,Ltd. (098120) +29.55%

Micro Contact Solution surged 29.55% after hitting the daily upper price limit, a move reported across several outlets [15][16]. The rally was reinforced by a broader uptrend in semiconductor materials and component stocks, which lifted the entire sector [16]. Additionally, heightened demand for test sockets—a core product for the company—has raised earnings expectations, further fueling the price jump [18].

Hyundai MARINE & FIRE INSURANCE CO.,LTD (001450) +8.49%

Hyundai Marine & Fire Insurance climbed 8.49% as analysts raised its target price, prompting buying pressure that pushed the stock into the 10% gain range and a 52‑week high [19][20][22][23]. The surge was reinforced by a Q2 earnings surprise that comfortably beat forecasts, boosting confidence in the insurer's performance [21][24]. Moreover, expectations of dividend reinstatement added further momentum to the rally [21].

Sources

1. 이수페타시스 주가, 8월 14일 95,600원 1.24% 하락 마감 — 톱스타뉴스 · 2026-08-14
2. 이수페타시스 주가 상승 중 — 아시아뉴스통신 · 2026-08-18
3. [실적속보]이수페타시스, 올해 2Q 매출액 급증 3799억원... 전년동기比 57%↑ (연결) — 씽크풀 AI · 2026-08-14
4. [특징주] 이수페타시스, AI 기판 수요 견인에 10만원 돌파 : 기업주식정보 — 재경일보 · 2026-08-18
5. 이수페타시스 주가, 8월 18일 장중 104,500원 9.31% 상승 — 톱스타뉴스 · 2026-08-18
6. 이수페타시스 주가, 8월 18일 장중 106,900원 11.82% 상승 — 중앙이코노미뉴스 · 2026-08-18
7. [ET특징주] 라면 해외 성장 기대감… '불닭' 삼양식품, 주가 6%↑ — 전자신문 · 2026-08-18
8. [특징주] 삼양식품, '수출 실적 기대감'에 장초반 강세 — 연합뉴스 · 2026-08-18
9. "삼양식품, 차별화된 경쟁력·성장성 아직 주가에 반영 안돼"-유안타 - 머니투데이 — mt.co.kr · 2026-08-17
10. 삼양식품 주가, 8월 14일 1,270,000원 4.18% 상승 마감 — 톱스타뉴스 · 2026-08-14
11. [이번주 관심주] 삼양식품 2Q 실적발표 완료...글로벌 붉닭 성장으로 전고점 회복할까 — 오피니언뉴스 · 2026-08-17
12. [애널픽] 삼양식품, 사상최대 실적에도 PER 12배...증권가 "여전히 싸다" — 뷰어스 · 2026-08-17
13. 아난티 주가, 급등세... 왜? — 금강일보 · 2026-08-18
14. 아난티 주가, 8월 18일 장중 4,825원 22.15% 상승 — 중앙이코노미뉴스 · 2026-08-18
15. 마이크로컨텍솔 주가, 상한가... 왜? — 금강일보 · 2026-08-18
16. 마이크로컨텍솔 주가 상한가 기염…반도체 재료·부품주 릴레이 불기둥 — 핀포인트뉴스 · 2026-08-18
17. [특징주]마이크로컨텍솔, 상한가 터치하며 3만 7천 원선 돌파 — 남도일보 · 2026-08-18
18. [특징주] 마이크로컨텍솔, 반도체 부품株 강세 속 상한가 직행…테스트 소켓 수요 부각 — 와이드경제 · 2026-08-18
19. [특징주] 현대해상, 목표가 줄상향에 10%대 급등…52주 신고가 — 연합뉴스 · 2026-08-18
20. [특징주] 현대해상, 증권가 목표가 줄상향에 신고가 터치 - g-enews.com — g-enews.com · 2026-08-18
21. 호실적에 현대해상 주가 '쑥'...배당 재개 기대감 커진다 — 논객닷컴 · 2026-08-18
22. 현대해상 주가 장중 10%대 강세, 상반기 이익 개선에 증권가 목표주가 상향 — 비즈니스포스트 · 2026-08-18
23. 현대해상, 2분기 호실적에 목표가도 줄상향…52주 신고가 경신 — 매일신문 · 2026-08-18
24. [특징주]현대해상, 2분기 ‘어닝 서프라이즈’에 주가 10%대 급등…52주 신고가 — 남도일보 · 2026-08-18

This is market commentary, not investment advice.