Reference time: 2026-06-05 19:50 KST

Today, 코스피 plunged 5.54% on the 'Broadcom shock,' falling to the 8,160 level. It was a 'Black Friday' in which weakness in U.S. semiconductor stocks and a sharp rise in the exchange rate overlapped, while heavy foreign selling in 코스피 pulled the index lower.

코스피 closed at 8,160.59. It fell 478.82 points, or 5.54%, from yesterday.

The previous close was 8,639.41, so this was a steep one-day drop.

At 9:08 a.m., a sell-side sidecar was triggered. A sidecar is a safeguard that halts program sell orders for 5 minutes when prices fall too quickly.

Around 10:18 a.m., the index briefly fell as low as 8,038.10, with the decline reaching 6.96%.

코스닥 closed at 1,002.44. It fell 47.29 points, or 4.50%, but after dropping to the 990 level intraday, it held the 1,000 level.

(Source: 파이낸셜뉴스 https://www.fnnews.com/news/202606051552342318 , 이투데이 https://www.etoday.co.kr/news/view/2590931 )

In 코스피, foreigners sold about 3조 5천억 원 worth of shares. Depending on the media outlet, the figure differs slightly, ranging from 3조 5천억~4조 4천억 원.

Foreigners have sold for 20 consecutive trading days from the 7th of last month through today. The amount sold during this period alone reached 70조 1,580억 원.

Institutions also sold about 9천4백억 원. Retail investors bought about 4조 2천억 원, supporting the index.

As foreigners sold for an extended period, that money flowed out in dollars, and the exchange rate rose as well.

(Source: 뉴스핌 https://www.newspim.com/news/view/20260605000722 , 파이낸셜뉴스 https://www.fnnews.com/news/202606051552342318 )

Few sectors rose. Textiles and apparel, and food, beverages, and tobacco held up to some extent.

Most sectors declined. Electrical and electronics, including semiconductors, distribution, machinery and equipment, insurance, medical and precision equipment, IT services, construction, metals, and chemicals were all weak.

Semiconductors pulled down the broader market. After U.S. semiconductor stocks collapsed overnight, profit-taking, meaning selling shares that had risen to lock in gains, flooded into Korean semiconductors as well.

(Source: 파이낸셜뉴스 https://www.fnnews.com/news/202606051552342318 )

The two leading semiconductor stocks both fell sharply.

삼성전자 closed at -6.40%, and SK하이닉스 at -9.92%. SK하이닉스 fell nearly 10%.

SK스퀘어 -7.57%, 삼성생명 -5.82%, and LG에너지솔루션 -1.90% also declined.

삼성물산 posted the largest drop at -13.93%. As it had recently risen on governance-related expectations, the pullback was large.

(Source: 이투데이 https://www.etoday.co.kr/news/view/2590931 )

1) U.S. Broadcom presented a 3rd-quarter artificial intelligence chip revenue outlook of 160억 달러. This was below the market expectation of 172억 달러, and its share price plunged 12.59% overnight. It shocked the broader semiconductor and technology sector, including 삼성전자 and SK하이닉스. (이투데이 https://www.etoday.co.kr/news/view/2590702 )

2) It became known that Micron’s chief executive had sold his own stake. Micron shares fell 7.74%, further chilling investment sentiment toward memory semiconductors. (이투데이 https://www.etoday.co.kr/news/view/2590702 )

3) At 9:08 a.m., a 코스피 sell-side sidecar was triggered. Program sell orders were halted for 5 minutes. (뉴스핌 https://www.newspim.com/news/view/20260605000722 )

4) The won-dollar exchange rate closed at 1,539.1원, the highest in more than 17 years. The sharp rise in the exchange rate encouraged foreign selling. (이투데이 https://www.etoday.co.kr/news/view/2590934 )

5) There was also analysis that funds were flowing out ahead of the upcoming SpaceX listing. This put pressure on both the index and the exchange rate. (파이낸셜뉴스 https://www.fnnews.com/news/202606051552342318 )

Lee Kyung-min, a researcher at Daishin Securities, said Broadcom presented 3rd-quarter AI revenue guidance of 160억 달러, below the estimate of 172억 달러, and that as semiconductor investment sentiment weakened, profit-taking emerged in domestic semiconductor stocks. This explains the direct cause of today’s semiconductor plunge and index decline.

Kang Jin-hyuk, a researcher at Shinhan Investment & Securities, said disappointment over Broadcom’s guidance and the Micron CEO’s stake sale were behind the decline in semiconductor stocks, and that fund outflows ahead of the SpaceX listing affected both the index and the exchange rate. This points to why not only stock prices but also the exchange rate moved sharply.

Han Ji-young, a researcher at Kiwoom Securities, assessed that technical and supply-demand factors, such as the burden from the index having risen too quickly and the deepening concentration in semiconductors, were larger factors, and that today’s plunge was creating entry appeal centered on semiconductors. This interprets the drop more as a cooling of overheating than as fear.

Common ground: All three firms viewed negative U.S. semiconductor news and the prior concentration and overheating in semiconductors as the core reasons for today’s plunge.

Difference: Daishin and Shinhan emphasized the shock from external negatives and fund outflows, while Kiwoom viewed the plunge as a correction creating price appeal.

Link to tomorrow: Whether U.S. semiconductor stocks fall further and whether the exchange rate rises above 1,540원 will decide the direction of the next trading day.

(Source: 뉴스핌 https://www.newspim.com/news/view/20260605000722 , 파이낸셜뉴스 https://www.fnnews.com/news/202606051552342318 )

No major disclosure was confirmed after the market close that appeared likely to change the market direction.

In the overnight foreign exchange market, the 1-month NDF was quoted at 1,532.7/1,533.1원. Exchange-rate pressure continued into the night. (이투데이 https://www.etoday.co.kr/news/view/2590934 )

The won-dollar exchange rate closed in the regular session at 1,539.1원. It rose 9.4원 from yesterday. Intraday, it climbed as high as 1,549.1원, the highest since March 2009. (이투데이 https://www.etoday.co.kr/news/view/2590934 )

European equities were weak. 유로스톡스50 was about -0.6%, 스톡스600 about -0.3%, and semiconductor stocks such as Infineon, ASML, and STM fell together.

International oil prices were around 92~95달러 per barrel. Volatility is large due to Middle East tensions.

Gold was confirmed at around 4,800달러 per ounce, while Bitcoin was around 7만 4천 달러. The U.S. 10-year Treasury yield was around 4.48%.

U.S. futures were mixed. Dow futures were somewhat firm, while S&P500 and 나스닥100 futures showed weakness.

Overnight, Broadcom (-12.59%) and Micron (-7.74%) fell sharply, while AMD and Qualcomm were also weak. Attention is on whether semiconductor weakness continues.

The U.S. May employment report, nonfarm payrolls, will be released tonight. Depending on the result, interest rates and exchange rates may move again.

The next trading day is Monday, June 8. June 6 is Saturday and the Memorial Day holiday, so the Korean stock market will be closed.

1) Tonight’s U.S. May employment report result and subsequent U.S. semiconductor stock moves.

2) Whether semiconductor negatives from Broadcom and Micron spread further.

3) Whether the won-dollar exchange rate breaks through the 1,540~1,550원 barrier.

4) Whether foreigners’ 20 consecutive trading days of net selling stops or continues further.

5) SpaceX listing schedule and related fund flows.

• 코스피200·코스닥150 closing levels and percentage changes: separate figures not confirmed in closing articles.

• Exact trading value for 유가증권 and 코스닥: final figures not confirmed in today’s articles.

• 코스피200 night futures current price: confirmed price not available as of 19:50, only overnight exchange-rate quotes confirmed.

• Exact amount of foreign net selling in 코스피: media figures differ from 3조5천억~4조4천억 원, so it is marked as a range.

파이낸셜뉴스 Black Friday 코스피 closing market report https://www.fnnews.com/news/202606051552342318

이투데이 Black Friday 코스피 plunges 5% and closes at 8160 https://www.etoday.co.kr/news/view/2590931

뉴스핌 코스피 plunges more than 5% on Broadcom shock and closes at 8160 https://www.newspim.com/news/view/20260605000722

머니투데이 Semiconductor stocks Broadcom shock 코스피 Black Friday https://www.mt.co.kr/stock/2026/06/05/2026060510333294559

아주경제 Today’s Pick Broadcom shock 삼전·하이닉스 plunge https://www.ajunews.com/view/20260605165417058

이투데이 Won-dollar exchange rate closes at highest since financial crisis https://www.etoday.co.kr/news/view/2590934

헤럴드경제 코스피 plunges 5%, foreigners sell for 20 consecutive trading days https://biz.heraldcorp.com/article/10764792

이투데이 New York stock movers Broadcom down 12.59%, Micron down 7.74% https://www.etoday.co.kr/news/view/2590702

한국경제 Semiconductor stocks shaken by Broadcom shock https://www.hankyung.com/article/202606058512i

KB의 생각 U.S. semiconductor stocks broadly fall after Broadcom impact https://kbthink.com/news-list/view.html?newsId=20260605081012712

헤럴드경제 Exchange rate breaks 1540원 for first time in 17 years https://biz.heraldcorp.com/article/10764237

Investing.com 코스피 index https://kr.investing.com/indices/kospi