The South Korean stock market saw a powerful rally on July 21, 2026, with the benchmark KOSPI surging 3.56% to close at 6,747.95, while the tech-heavy KOSDAQ rose 0.49% to 753.34. Foreign and institutional investors heavily bought KOSPI shares, recording net purchases of KRW 295,154 million and KRW 1,374,442 million respectively, while both groups net-sold on KOSDAQ. The day's strong performance was heavily supported by massive gains in major large-cap shares.
SamsungElectronics (005930) +6.15%
| P/E | P/B | EPS | Mkt Cap | ROE | Debt Ratio | 52W Range |
|---|---|---|---|---|---|---|
| 39.46 | 4.05 | 6,564 | ₩1,514.2T | 19.16% | 30.15% | 64,900–374,500 |
Samsung Electronics surged 6.15% despite ongoing downward pressures from 'AI bubble' concerns and the earnings outlooks of global Big Tech firms [4]. Market sentiment has also been influenced by worries over a semiconductor slowdown [1] and the shockwaves from China's AI model 'Kimi K3' [3]. While the stock rebounded strongly after initially starting lower in the previous session [2], the specific and direct catalyst for today's +6.15% surge remains unconfirmed from the available headlines alone [6].
SKSQUARE (402340) +6.46%
| P/E | P/B | EPS | Mkt Cap | ROE | Debt Ratio | 52W Range |
|---|---|---|---|---|---|---|
| 18.85 | 5.98 | 66,468 | ₩165.3T | 55.09% | 7.50% | 130,900–2,189,000 |
SK Square shares gained 6.46% on July 21, 2026. However, the provided headlines only note that the stock's rebound momentum had recently faltered following a sharp five-day decline [7], alongside general investment analysis reports [8]. The specific and direct core drivers behind today's +6.46% surge are not detailed in the available materials, leaving the exact cause of today's upward movement unconfirmed from the headlines alone.
SAMSUNG C&T CORPORATION (028260) +8.19%
| P/E | P/B | EPS | Mkt Cap | ROE | Debt Ratio | 52W Range |
|---|---|---|---|---|---|---|
| 24.25 | 1.13 | 14,165 | ₩55.7T | 5.41% | 49.88% | 155,300–565,000 |
Samsung C&T Corporation jumped 8.19%, driven by the expanding equity value of its stake in Samsung Electronics amid a broader rally in KOSPI large-caps alongside SK Hynix [9, 11]. Additionally, positive sentiment built around expectations that its cumulative annual orders will exceed KRW 10 trillion, bolstered by its sole bid for the Yeouido Mokhwa reconstruction project [12]. Analysts also noted that following a sharp drop on July 20 [10], the low point presented a strategic opportunity to accumulate shares [13].
Sources
- [주식전망] 삼성전자 급락에 반도체 한파까지…20일 증시 ‘긴장’ : 네이버 블로그 — Naver Blog · 2026-07-20
- [특징주] 삼성전자, 급락출발 후 상승전환해 강보합…하이닉스 1%↑ — 연합뉴스 · 2026-07-20
- 이번엔 중국 AI
키미 K3쇼크…삼성전자·하이닉스 주가 향방은? — 매일신문 · 2026-07-20 - 삼성전자·SK하이닉스 호실적에도 주가 끌어내리는 'AI 버블론', 알파벳 메타 아마존 실적이 판 가른다 — 비즈니스포스트 · 2026-07-20
- [메자닌 투자파일] 삼성전자 주식 다시 꺼낸 베뉴지…웨딩 확장 승부수 — 블로터 · 2026-07-20
- 삼성전자(005930) — 매일경제 마켓 · 2026-07-21
- 최근 5거래일 SK스퀘어 주가 급락 후 반등세 재차 꺾여 — 톱스타뉴스 · 2026-07-18
- SK스퀘어 투자분석 2026. 07. 19 — 주달 · 2026-07-19
- [오늘의 주목주] '삼성전자 지분가치 확대' 삼성물산 주가 8%대 올라, 코스피 외국인 기관 매수세에 6740선 상승 마감 — 비즈니스포스트 · 2026-07-21
- 삼성물산 주가, 7월 20일 317,500원 8.24% 하락 마감 — 톱스타뉴스 · 2026-07-20
- [서울데이터랩]코스피 시총 상위주 장중 강세…삼성물산 8%대 상승, 삼성전자·SK하이닉스 동반 급등 — twig24.com · 2026-07-21
- 삼성물산, 여의도 목화 재건축 단독 응찰…올해 수주액 10조 넘을 듯 — 더구루 · 2026-07-21
- 삼성물산(028260)저점을 줄때마다 물량 모아둘 기회로 보이며 이후 전망 및 대응전략. — 씽크풀 AI · 2026-07-20
This is market commentary, not investment advice.