Record-Breaking Profits, Yet the Stock Crashes? The Real Reason Behind Today’s KOSPI Circuit Breaker

On July 7, 2026, Samsung Electronics announced quarterly operating profits of 89 trillion won — a result for the history books. Yet its stock plunged nearly 10%, and the entire KOSPI market came to a grinding halt. So what on earth happened? When you break down today’s KOSPI circuit breaker event number by number, the answer to “but why?” becomes remarkably clear.

At 1:51 PM, the KOSPI Froze

At 1:51 in the afternoon, a Level 1 circuit breaker was triggered on the KOSPI. The index had fallen more than 8% from the previous session’s closing price and stayed there for over a minute, forcing a 20-minute halt on all trading. And this wasn’t even the first shock of the day. Back at 10:23 AM, the KOSPI 200 futures index had already dropped more than 5%, triggering a sell-side sidecar. In a single trading session, the market was hit by both a sidecar and a circuit breaker — a rare “double shock” that left investors reeling.

By the closing bell, the KOSPI had settled at 7,656.31, down 4.91% from the previous day. At its lowest point during the session, the index touched 7,389.22. Foreign investors dumped a net 2.9298 trillion won worth of shares, while institutional investors sold off another 309.2 billion won. Meanwhile, retail investors stepped in as buyers, snapping up a net 3.1343 trillion won — essentially trying to catch the falling knife on their own.

Samsung Posts 89 Trillion Won — the Best in the World — So Why Did It Crash?

The day’s defining moment was Samsung Electronics’ Q2 earnings release. The company reported revenue of 171 trillion won and operating profit of 89.4 trillion won for the second quarter. That operating profit figure represents a staggering 1,810% increase year-over-year and beat the market’s consensus estimate of roughly 84 trillion won. Excluding performance bonus provisions, Samsung’s Q2 operating profit is believed to have actually surpassed 100 trillion won.

So why did the stock crash? The answer is a classic case of “sell on the news.” Despite the record-shattering preliminary results, the stock fell victim to a “sell-on” phenomenon — where the market sells off once good news is officially confirmed, because that news was already priced in. Wall Street has a saying for this: “Buy the rumor, sell the fact.” In other words, the market had already baked in the spectacular earnings expectations, and the moment the numbers were officially out, traders hit the sell button en masse.

Samsung Electronics, which released its preliminary Q2 results before the opening bell, plunged 9.75% — breaking below the symbolic “300,000-won level” to land at 287,000 won. SK Hynix followed suit with a 10.58% drop, threatening its own milestone of 2,000,000 won per share. When the top two companies by market cap collapse in tandem, the entire index has nowhere to go but down.

Six Circuit Breakers in a Single Year — and Counting

What’s perhaps even more alarming than the crash itself is how often it’s been happening. Today’s circuit breaker was the sixth of the year and the twelfth in KOSPI history. Having six circuit breaker events in a single calendar year is completely unprecedented. The KOSPI had already experienced one just on June 26 — meaning the same market-halting event repeated itself within just seven trading days.

This pattern is a clear signal that what’s happening isn’t just a one-off event. The KOSPI rode the AI semiconductor supercycle all the way past the 7,000 and then 8,000 mark this year, but repeated waves of massive foreign investor profit-taking have turned extreme volatility into the new normal. What was once a highway has become a rollercoaster.

What Should Retail Investors Make of This Sell-Off?

As today’s 3-trillion-won-plus net buy by retail investors shows, some see a market crash as an opportunity. But there are a few things you absolutely need to think through before jumping in.

• Is the sell-off over? Samsung’s results were so dominant that short-term profit-taking is being absorbed, but it remains unclear when foreign selling will actually stop.
• Semiconductor fundamentals are still solid. Tight supply driven by booming global AI infrastructure investment and strong memory chip prices continue to fuel earnings. Industry insiders largely expect this semiconductor upcycle to last at least through next year.
• Dollar-cost averaging is key. Markets often bounce back after circuit-breaker-level drops, but nobody knows exactly where the bottom is. Going all-in at once is a dangerous game.
• The Level 2 circuit breaker (-15%) hasn’t triggered yet. That’s at least a mildly encouraging sign that panic selling hasn’t completely spiraled out of control.

Looking purely at the 89 trillion won in operating profit, Samsung Electronics is putting up the greatest earnings performance in its history. Yet the market used that very number as a reason to sell. This is the great irony of the stock market — and the coldest question the KOSPI is posing to investors right now: the fact that a company is doing well and the question of whether you should buy it today are two entirely different conversations.

Sources

• 고장난 코스피, 32번째 사이드카·6번째 서킷브레이커 발동 [fn마감시황] – 파이낸셜뉴스
• 또 멈춘 코스피…올해 6번째 서킷브레이커 발동 – 파이낸셜뉴스
• 분기 영업익만 90조인데…삼성전자 주가 와르르, 왜? – 헤럴드경제
• 코스피, 서킷브레이커 발동…삼성전자 어닝서프라이즈에도 급락 – 에너지뉴스
• 삼성전자, 2분기 ‘어닝 서프라이즈’…영업익 89조4000억 – 더퍼블릭