NVIDIA, ranked first in Tuesday's US stock trading volume, closed up 1.18% with a turnover of $29.328 billion. The company has entered into a long-term agreement to supply Meta Platforms with millions of its current and future-generation artificial intelligence chips, including CPUs. NVIDIA did not disclose the value of the deal but confirmed it encompasses its existing Blackwell chips and the upcoming Rubin AI chips, as well as separately installed Grace and Vera central processing units.

The announcement indicates NVIDIA's strategy to expand its chip sales into emerging areas, such as powering AI agents and processors for routine technical tasks like database operations. While NVIDIA has never specified its sales to Meta, the market widely regards Meta as one of NVIDIA's top four customers, reportedly accounting for 61% of its revenue in the most recent fiscal quarter.

Tesla, the second most actively traded stock, closed down 1.63% with a turnover of $24.061 billion. A report submitted by Tesla to US regulators revealed that its autonomous taxi service reported 14 collisions within eight months of operation in Austin. The incidents ranged from property damage to minor injuries and hospitalizations. Tesla has not disclosed the current size of its Austin autonomous taxi fleet but plans to expand the service to approximately seven additional cities by mid-year.

The first incident occurred last July and was initially reported as property damage only. However, a supplemental report filed in December indicated minor injuries and a hospitalization related to that event. Another July incident also resulted in minor injuries. Tesla's latest report details five new accidents from December and January, including one in January where a stationary autonomous taxi collided with an Austin city bus, and two others involving vehicles hitting objects while reversing in parking lots.

Apple, the third most traded stock, closed up 3.17% with a turnover of $15.209 billion. Reports emerged on Tuesday that Apple is accelerating development of three new wearable devices as part of its shift towards AI-driven hardware, a sector where it competes with OpenAI and Meta Platforms. According to sources, Apple is increasing investment in smart glasses, a wearable pendant that can be clipped to clothing or worn as a necklace, and AirPods with enhanced AI capabilities. All three devices will be built around the Siri digital assistant, which will utilize visual context to execute commands. Each product will connect to the iPhone and rely on distinct camera systems.

Additionally, after Tuesday's market close, Berkshire Hathaway disclosed it reduced its stake in Apple by 10,294,956 shares, bringing its total holding to 227,917,808 shares.

Amazon, also ranked third by trading volume, closed up 1.19% with a turnover of $13.585 billion. This gain came after a nine-session losing streak that erased over $450 billion from its market capitalization. Post-market filings showed Berkshire Hathaway also reduced its Amazon stake by 7,724,000 shares, to 2,276,000 shares. Conversely, Pershing Square Capital Management increased its Amazon holdings by 65.0%, to 9.6 million shares.

Micron Technology, ranked sixth, closed down 2.89% with a turnover of $11.366 billion. Reports indicate the company is investing $200 billion to construct new factories aimed at alleviating AI memory bottlenecks. Micron is accelerating capacity expansion to address the most severe supply crunch in the memory industry in over four decades. At its Boise headquarters, the company is spending $50 billion to more than double its 450-acre campus, including building two new chip fabrication plants. Since last April, Micron's stock price has surged over fivefold to approximately $414, elevating its market capitalization close to $500 billion.

SanDisk, ranked seventh, closed down 5.74% with a turnover of $10.801 billion. The company announced after the close that selling shareholders may offer up to 7,513,019 shares of common stock.

Broadcom, ranked tenth, closed up 2.27% with a turnover of $7.05 billion. A 13F filing revealed that Harvard Management increased its holdings in Alphabet (Google), Broadcom, TSMC, Booking Holdings, and Meta Platforms during the fourth quarter.

Walmart, ranked fourteenth, closed down 3.76% with a turnover of $4.493 billion. The stock had hit a record high the previous Friday.

Lumentum, ranked sixteenth, closed up 6.70% with a turnover of $3.279 billion. Wall Street analysts identified the company as a core participant in the "Google TPU AI computing chain" and an essential optical component supplier for the "NVIDIA AI GPU computing chain." Following strong quarterly results and outlook, a growing number of financial institutions are bullish on the stock's continued upward trajectory into 2025. Lumentum's shares have surged 340% over the past year, solidifying its status as a major AI computing theme stock, with a year-to-date gain exceeding 56%.

Oracle, ranked nineteenth, closed down 3.85% with a turnover of $2.951 billion. Oracle Power Group stated on Tuesday that it is addressing objections related to the application for mining lease M25/389.