The U.S. stock market in New York rebounded on July 9 (Korean time afternoon), led by technology stocks, while share prices of major AI semiconductor names moved sharply in opposite directions. Nvidia fell more than 6%, while AMD and Broadcom both rose over 6%. Amazon and Meta also showed strong gains of around 5%, with Tesla and Alphabet joining the upward trend. Following last week's sharp decline in U.S. markets, a broad tech rebound and company-specific negative news are emerging simultaneously.

Nvidia Plunges Over 6% After Announcement of CEO-Related Investigation

After 11:30 p.m. on July 9 Korean time, Nvidia (NVDA) traded at $175.39 in the U.S. market, down $11.25 (6.03%) from the previous session. Volume was 98,593,350 shares with a trading value of $17.2 billion, and its market capitalization stood at approximately $4.224 trillion.

Nvidia's decline is notable given that major U.S. tech stocks were mostly rising. Earlier, Nvidia's board announced it would launch an independent investigation into allegations that foreign intelligence agencies sought to collect information involving CEO Jensen Huang. The board stated that, so far, there is no basis to believe national security or Nvidia's confidential information was compromised. However, market caution appears to have increased as the investigation proceeds.

AMD and Broadcom Both Surge Over 6%

AMD (AMD) rose $28.41 (6.33%) from the previous session to $477.45, with volume of 6,893,081 shares, a trading value of $3.235 billion, and a market capitalization of approximately $783.2 billion.

AMD competes with Nvidia in the AI computing semiconductor market. Investors are focused on the fact that two companies in the same semiconductor industry are moving in opposite directions. With Nvidia down 6.03% and AMD up 6.33%, the gap in their price movements reached 12.36 percentage points. However, this difference alone cannot confirm that investor funds moved directly from Nvidia to AMD.

Broadcom (AVGO) traded at $312.20, up $18.51 (6.30%) from the previous session, with volume of 4,553,235 shares, a trading value of $1.39 billion, and a market capitalization of approximately $1.4871 trillion. Broadcom is closely tied to the AI industry through custom semiconductors and network infrastructure. The simultaneous 6%-plus gains by AMD and Broadcom show that AI-related semiconductor stocks are not all moving in the same direction.

Memory chipmaker Micron Technology (MU) also rose, gaining $12.24 (1.77%) from the previous session to $702.24, with volume of 3,923,562 shares and a trading value of $2.728 billion. Micron, which operates a memory semiconductor business including high-bandwidth memory (HBM), draws attention in connection with expanding AI server investment. Among semiconductor stocks that day, AMD and Broadcom posted standout gains while Micron showed a relatively gradual rise.

Amazon and Meta Up Over 5%... Tesla and Alphabet Also Strong

Large-cap tech stocks were broadly stronger as well. Amazon.com (AMZN) traded at $274.04, up $14.74 (5.68%) from the previous session, with volume of 7,974,574 shares, a trading value of $2.162 billion, and a market capitalization of approximately $2.9616 trillion. Amazon operates cloud and AI infrastructure businesses through Amazon Web Services (AWS) in addition to e-commerce. Its stock rose amid growing market attention on cost burdens and profitability issues stemming from recent expanded AI data center investment.

Meta Platforms (META) rose $31.61 (5.18%) from the previous session to $641.76, with volume of 2,494,216 shares and a trading value of $1.584 billion. Meta, a leading big tech company making large-scale investments in AI model development and data center construction, climbed more than 5% despite lingering concerns over AI investment costs.

Alphabet (GOOGL), the parent of Google, traded at $295.46, up $10.68 (3.75%) from the previous session, with volume of 5,590,375 shares and a trading value of $1.639 billion. Alphabet is also expanding its cloud services and generative AI businesses, making it a key stock for gauging overall U.S. tech investment sentiment.

Electric vehicle maker Tesla (TSLA) rose $15.25 (4.26%) from the previous session to $373.47, with volume of 4,044,687 shares and a trading value of $1.481 billion. Tesla is pursuing autonomous driving and robotics technology development in addition to EVs, making it one of the stocks most sensitive to shifts in growth-stock sentiment.

Data storage company SanDisk (SNDK) rose $18.27 (2.19%) from the previous session to $853.33, with volume of 2,065,705 shares and a trading value of $1.73 billion. SpaceX (SPCX) traded at $140.01, up $5.74 (4.28%) from the previous session, with volume of 16,684,659 shares and a trading value of $2.296 billion.

Diverging Trends Amid the Rally... Sustainability Uncertain

The most striking feature of the day's moves was Nvidia's steep fall even as tech stocks rallied. This contrasts with AMD and Broadcom gaining more than 6% and Amazon and Meta rising around 5%. It shows the U.S. market rally does not apply equally to all AI-related companies, with price differentiation widening within the semiconductor sector based on individual companies' business outlooks and uncertainties.

U.S. markets previously experienced a sharp correction as concerns over AI companies' investment costs and regulatory possibilities came to the fore. Major tech stocks' rebound recovered some of the shock from last week's plunge, but the sustainability of the rally remains uncertain. U.S. monetary policy, inflation outlook, regulatory discussions on the AI industry, and large tech companies' investment plans remain key variables for the market going forward. In particular, whether Nvidia's decline continues and whether AMD and Broadcom's gains hold will be important watch points for judging the short-term direction of the semiconductor sector.

Dow Up 1.15%, Nasdaq Up 1.24%

Major U.S. market indexes also rose. The Dow Jones Industrial Average gained 587.91 points (1.15%) from the previous session to 51,873.64. The S&P 500 rose 77.03 points (1.04%) to 7,453.89, and the Nasdaq Composite climbed 303.57 points (1.24%) to 24,882.99. As major indexes and large-cap tech stocks rose together while Nvidia plunged, the sector-wide upward trend and individual stock risk factors are being highlighted simultaneously.

Note that current prices are intraday figures and may differ from the regular session's closing results. [This article was partially produced with AI assistance. It does not recommend buying or selling any specific stock, and investment decisions and responsibilities rest with the investor.]