Stock markets experienced another wave of significant volatility, with the artificial intelligence sector once more being a primary driver of the downturn.

On Tuesday, investors focused their selling on semiconductor chip stocks and other shares linked to AI. The tech-heavy Nasdaq Composite Index fell sharply by 2.21%, while the S&P 500 index dropped 1.44%. The Dow Jones Industrial Average, which has a lower weighting of technology stocks, declined by approximately 0.1%.

Both the S&P 500 and the Nasdaq recorded their largest single-day drops in nearly two weeks. This sell-off followed a wave of heavy selling that had already begun in Asian markets. Concerns about the AI sector intensified rapidly in South Korea on Tuesday, escalating into widespread panic trading. The KOSPI index plummeted by 10%, triggering a circuit breaker that halted trading for 20 minutes to allow the panic to subside.

The share prices of the world's two leading memory chip manufacturers, SK Hynix and Samsung Electronics, each fell more than 12%, dragging down the broader Korean market. These two chip giants together account for nearly half of the total market capitalization of the KOSPI index.

A senior market economist at Capital Economics noted in a report, "These kinds of large swings are part of a broader trend of increasing volatility in tech stocks. In our view, this volatility confirms that market froth is high and raises questions about the sustainability of this rally."

The U.S. stock market started the week on a weak note, with the Nasdaq falling 1.3% on Monday before the decline accelerated on Tuesday. The modest sell-off in U.S. tech shares on Monday spread into the Asian trading session and intensified further by Tuesday.

The traders' panic did not stem from a specific piece of negative news, and there was no clear trigger for this large-scale sell-off. However, the pessimistic sentiment continued to spread to the United States, resulting in a dismal trading day for tech stocks. Some investors may have chosen to take profits and exit positions following the substantial gains seen in the prior period.

Some market analysts believe a sharp drop in the shares of Google and SpaceX on Monday helped trigger the market's anxiety. Google fell 5% that day, primarily due to a key AI executive leaving to join Anthropic. SpaceX plunged 16% on Monday, experiencing a volatile pullback after its initial post-IPO surge, a common occurrence for newly public stocks.

On Tuesday, Google's losses narrowed to less than 1%, while SpaceX shares experienced significant intraday volatility before closing with a modest gain of about 1%. Nvidia fell approximately 4%, contributing to the broader market weakness. Oracle tumbled more than 5.5%, bringing its monthly decline to nearly 27%.

Other analysts suggest the market's decline was a reaction to the potential for interest rate hikes by the Federal Reserve within the year. However, this was not new information. The new Fed Chair, Kevin Warsh, held his first press conference last Wednesday, stating the Fed would intensify its efforts to curb inflation. Traders interpreted these remarks as a clear signal for rate hikes this year, and selling began immediately after the announcement.

Semiconductor chip stocks, which have led the market's gains this year, fell sharply across the board on Tuesday. Micron Technology plunged 13%, and Marvell Technology dropped 9%. Trading investors are now awaiting Micron Technology's quarterly earnings report, scheduled for Wednesday.

Regardless of the exact trigger, AI company valuations are at extremely high levels, and growth expectations are stretched, making the sector vulnerable to investor panic at the slightest sign of trouble. The KOSPI index had gained over 90% year-to-date, and when sentiment shifted, traders and the more influential quantitative trading algorithms began selling in concert. Investors fear that, much like a precarious Jenga tower, the rally could collapse from its peak at any moment.

The stock market has always faced an unsolvable puzzle: no one can determine how high this frothy Jenga tower can be stacked. For now, the market may still be in a phase of building from the base upward.

Nevertheless, the panic from the Korean market quickly spread across Asia. Japan's Nikkei 225 index fell 3.6%, with tech giant SoftBank Group plunging 15%. Most other major Asian stock indices declined by more than 1%.

Although tech stocks have been under pressure recently, the overall pullback has not been particularly severe. The Nasdaq is only down about 5.5% from the all-time high it reached on June 2nd. On a year-to-date basis, this tech-weighted index is still up by 10%.

In early trading on Wednesday, the KOSPI index rebounded by 3%, and Samsung Electronics surged 7%, recouping most of its losses. This movement provides the latest evidence that Tuesday's plunge was a short-term correction, similar to several other brief sell-offs the market has experienced in recent months.

For much of the past two months, U.S. stock indices have been at or near record highs. Since President Trump announced a ceasefire agreement with Iran in April, the market has largely shifted its focus away from geopolitical conflicts, turning its attention significantly back to the AI sector and Federal Reserve interest rate policy.

A case in point: oil prices edged slightly lower again on Tuesday as traders expressed optimism about clear progress in peace talks.

A global real assets analyst at Wells Fargo Investment Institute stated in a report, "The stock market's focus is shifting away from the war in the Middle East toward whether tech sector spending can be sustained in a global environment of rising interest rates. The valuation of the AI sector and tech companies is once again at the forefront of market attention."