KOSPI and KOSDAQ Plunge as Institutional Selling Dominates the Session

On July 20, 2026, Korean markets suffered a steep decline, with the KOSPI dropping 4.46% to 6,516.27 and the KOSDAQ falling 5.33% to 749.64. The USD/KRW exchange rate closed at 1,486.95 amid heavy institutional selling, which totaled 919,070 million KRW on the KOSPI and 134,851 million KRW on the KOSDAQ, overshadowing foreign net buying of 515,366 million KRW on the KOSPI.

SK eternix (475150) +7.50%

P/E	P/B	EPS	Mkt Cap	ROE	Debt Ratio	52W Range
61.43	6.91	910	₩1.9T	9.60%	419.70%	17,210–69,300

SK eternix rose 7.50% as international oil prices climbed past $90, positioning the company as a prominent renewable energy play [1], [4]. Market supply and demand dynamics improved significantly, driven by institutional investors net-buying the stock for seven consecutive sessions and foreign investors expanding their ownership stakes [2], [6]. Additionally, backing from private equity firm KKR has helped the firm gain traction as a 'national renewable energy stock' [5]. Over five trading days, the stock successfully jumped from the 40,000 won range to the 50,000 won range [3].

ROKIT HEALTHCARE Inc. (376900) +26.99%

P/E	P/B	EPS	Mkt Cap	ROE	Debt Ratio	52W Range
-313.27	82.97	-196	₩975B	13.07%	936.15%	14,120–153,800

ROKIT HEALTHCARE surged 26.99% to close at 61,400 won on July 20 [8]. The primary driver behind this sharp upward movement was strong, simultaneous net buying from both foreign and institutional investors during the trading session [7]. Aside from this favorable supply-demand dynamic, there are no other specific business developments, positive catalysts, or fundamental drivers identified in the available headlines to explain the stock's massive single-day gain [7], [8].

HYUNDAI HYMS CO., LTD. (460930) +13.34%

P/E	P/B	EPS	Mkt Cap	ROE	Debt Ratio	52W Range
22.78	1.93	604	₩489B	9.15%	30.38%	10,380–33,450

HYUNDAI HYMS advanced 13.34%, marking its third consecutive day of strong gains [9]. The stock experienced concentrated buying interest, triggering multiple volatility interruption (VI) halts starting even before the market opened during the NXT stage [9]. While investment analysis reports for the company were recently published on July 18 [10], the specific business catalysts, positive news, or underlying fundamental reasons driving this sudden upward momentum and heavy buying pressure remain unconfirmed from the available headlines.

Sources

1. SK이터닉스 주가 장중 10%대 상승, 국제유가 상승에 신재생에너지주 부각 — 비즈니스포스트 · 2026-07-20
2. [장중수급포착] SK이터닉스, 기관 7일 연속 순매수행진... 주가 +8.85% — 뉴스핌 · 2026-07-20
3. 최근 5거래일 SK이터닉스 주가 4만원대서 5만원대 도약 — 톱스타뉴스 · 2026-07-18
4. [특징주] 유가 90달러 돌파에 신재생에너지株 강세…SK이터닉스 5% 상승 — Chosunbiz · 2026-07-20
5. KKR 날개에 ‘국민 신재생주’ 된 SK이터닉스 — v.daum.net · 2026-07-16
6. 15일, 외국인 보유 비중 확대... SK이터닉스, 대원전선우, JW신약 등 — 씽크풀 AI · 2026-07-16
7. [장중수급포착] 로킷헬스케어, 외국인/기관 동시 순매수… 주가 +27.40% — 뉴스핌 · 2026-07-20
8. 로킷헬스케어 주가, 7월 20일 61,400원 26.99% 상승 마감 — 톱스타뉴스 · 2026-07-20
9. [속보] 현대힘스 장전 NXT부터 수차례 VI 발동, 주가 도약…3거래일 연속 강세 — CBC뉴스 · 2026-07-20
10. 현대힘스 투자분석 2026. 07. 18 — 주달 · 2026-07-18

This is market commentary, not investment advice.