The AI market is experiencing a period of adjustment as the year concludes, with some companies facing stock declines while others make strategic investments to capitalize on the sector's long-term growth. Nebius Group, an AI cloud and infrastructure provider, saw its shares drop 1.6% on December 29, 2025, following CEO Arkady Volozh's plan to sell 41,000 shares. The stock fell further by 3.9% to $87.59 as year-end trading began, with investors closely monitoring its major AI contracts, including a December deployment tranche for Meta Platforms. Nebius also has significant multi-year deals with Microsoft and recently announced new AI Cloud software featuring Nvidia Blackwell Ultra compute. Despite some market cooling, major players continue to invest heavily in AI. Warren Buffett's Berkshire Hathaway holds about 23% of its investment portfolio in three AI-linked companies. Apple, making up 20.5% of the portfolio, plans to launch a new Siri with generative AI features in 2026, aiming to boost iPhone sales and service income. Alphabet, another significant holding, saw Berkshire Hathaway acquire 17.8 million shares in Q3. Alphabet's cloud business is expanding rapidly, leveraging its custom Tensor Processing Units (TPUs) for AI. Alphabet further solidified its AI infrastructure by acquiring Intersect for $4.75 billion, aiming to manage energy costs for its AI data centers and reduce reliance on external energy providers. In the chip sector, Samsung is reporting profits from AI memory chips that surpass its 2018 memory boom levels, driven by strong demand for High Bandwidth Memory (HBM). The company secured new orders for its HBM3E chips from major customers like NVIDIA and Broadcom after passing NVIDIA's quality tests in September. Meanwhile, Vertiv Holdings Co is positioned as a crucial player in AI infrastructure, providing essential cooling, power, and IT solutions for the demanding data centers required by AI. However, not all AI-focused companies are thriving; BigBear.ai, which offers custom AI solutions to government clients, experienced a 20% revenue drop in Q3 2025 and faces challenges due to its consulting-like business model. In other developments, Deutsche Telekom's T.Capital invested in Lovable, a Swedish AI app platform, and Kodiak AI shares saw a 3.2% increase on Friday.
Key Takeaways
- Nebius Group shares dropped 1.6% and then 3.9% to $87.59, reflecting a cooling AI market, despite major AI contracts with Meta and Microsoft and new Nvidia Blackwell Ultra compute.
- Warren Buffett's Berkshire Hathaway has invested approximately 23% of its portfolio in AI-linked companies, including Apple (20.5%) and Alphabet (17.8%).
- Apple plans to launch a new Siri with generative AI features in 2026, aiming to increase iPhone sales and service income.
- Alphabet acquired Intersect for $4.75 billion to manage energy costs for its AI data centers and reduce reliance on outside energy providers.
- Alphabet's cloud business is experiencing rapid growth, utilizing specialized Tensor Processing Units (TPUs) for AI.
- Samsung's profits from selling AI memory chips (HBM3E) are higher than its 2018 memory boom, securing new orders from NVIDIA and Broadcom.
- Vertiv Holdings Co provides essential infrastructure like cooling and power solutions for data centers, crucial for the growth of Artificial Intelligence.
- BigBear.ai, a provider of custom AI solutions to government clients, saw its revenue drop 20% in Q3 2025 and faces challenges with its consulting-like business model.
- Deutsche Telekom's investment branch, T.Capital, invested in Lovable, a Swedish company specializing in AI app platforms.
- Kodiak AI shares increased by 3.2% during trading on Friday.
Nebius Stock Drops as CEO Sells Shares Amid AI Market Cool Down
Nebius Group shares fell 1.6% on December 29, 2025, after CEO Arkady Volozh announced plans to sell 41,000 shares. This "sell to cover" transaction, valued at about $3.6 million, will happen around year-end. The stock drop reflects a wider cooling in the AI market, with other major tech companies also seeing declines. Nebius, an Amsterdam-based AI cloud and infrastructure provider, has significant deals with Meta and Microsoft.
Nebius Stock Falls as Year Ends, AI Contracts Watched
Nebius Group shares dropped 3.9% to $87.59 on Friday as the year-end trading period began. Investors are closely watching the company's progress on major AI contracts, especially the December deployment tranche for Meta Platforms. Nebius provides GPU capacity for AI models and has large multi-year deals with Microsoft and Meta. The company also recently announced new AI Cloud software with Nvidia Blackwell Ultra compute.
Warren Buffett Holds Big Stakes in Three AI Stocks
Warren Buffett's Berkshire Hathaway has about 23% of its investment portfolio in three companies linked to Artificial Intelligence. Apple makes up 20.5% of the portfolio, though Buffett has sold some shares due to its high value and portfolio size. Apple plans to launch a new Siri with generative AI features in 2026, which could increase iPhone sales and service income. Alphabet is another major holding, with Berkshire Hathaway buying 17.8 million shares in Q3. Alphabet's cloud business is growing fast and uses special Tensor Processing Units for AI.
Buffett Invests Heavily in Three AI-Linked Companies
Warren Buffett's Berkshire Hathaway has invested about 23% of its portfolio in three companies connected to Artificial Intelligence. Apple, the largest holding at 20.5%, plans to release a new Siri with generative AI features next year, which could boost sales. Alphabet, a newer addition, saw Berkshire Hathaway acquire 17.8 million shares in Q3. Alphabet's cloud computing business is growing strongly, and its search engine effectively uses AI to increase traffic and revenue. Buffett looks for companies with lasting competitive strength, and these AI-linked stocks fit his long-term strategy.
BigBear.ai Stock Faces Challenges Despite AI Boom
BigBear.ai, a company providing custom AI solutions to government clients, saw its revenue drop 20% in Q3 2025. The company focuses on specific contracts like the U.S. Army's Global Force Information Management-Objective Environment system and airport security software. While BigBear.ai acquired Ask Sage in Q3, its business model is more like consulting, leading to lower gross margins than typical software platforms. The stock is currently expensive, trading at 14 times sales, and analysts believe it is unlikely to double in 2026.
Deutsche Telekom Invests in Swedish AI App Platform Lovable
Deutsche Telekom's investment branch, T.Capital, has invested in Lovable, a Swedish company that develops app platforms. This venture capital injection closes out 2025 for T.Capital, adding another AI tech partner to its portfolio. Lovable specializes in areas like AI, app development, and no-code software tools. This move shows Deutsche Telekom's continued interest in supporting enterprise AI solutions.
Vertiv Poised to Be Key Player in AI Infrastructure
Vertiv Holdings Co provides essential infrastructure for data centers, including cooling, power, and IT solutions. The company is seeing high demand due to the fast growth of Artificial Intelligence, which requires powerful data centers. Vertiv's advanced cooling systems help manage the significant heat generated by AI computing, and its power solutions ensure reliable energy. Analysts are positive about Vertiv's future, believing it could become a crucial company in the AI revolution, but it must keep innovating in a competitive market.
Samsung Sees Huge Profits From AI Chip Sales
Samsung's profits from selling AI memory chips are now higher than during the 2018 memory boom. The company's success comes from strong demand for advanced DRAM memory, especially High Bandwidth Memory or HBM. Samsung improved its 10-nanometer DRAM technology and secured new orders from big customers like NVIDIA and Broadcom for its HBM3E chips. Vice Chairman Jeon Young-hyun's focus on core technology helped Samsung pass NVIDIA's quality tests in September, allowing it to catch up to competitor SK Hynix in the HBM market.
Kodiak AI Stock Rises 3.2 Percent
Kodiak AI shares increased by 3.2% during trading on Friday. The company's stock reached a high of $10.50 and a low of $9.98 during the trading session.
Alphabet Buys Intersect for 4.75 Billion Dollars
Alphabet recently bought Intersect for $4.75 billion to help manage its energy costs for AI data centers. Intersect develops large-scale energy storage solutions, including advanced battery technology. This purchase allows Alphabet to control its data center capacity more efficiently and reduce reliance on outside energy providers. The move shows Alphabet's strategy of owning all parts of its operations, from custom chips like TPUs to energy infrastructure. This acquisition suggests that major tech companies will increasingly invest in energy solutions, not just new chips, to succeed in the AI revolution.
Sources
- NBIS stock slides after Nebius CEO files to sell shares as AI trade cools
- Nebius stock slips nearly 4% into year-end as traders eye Fed minutes and AI contract rollouts
- Warren Buffett Has 23% of Berkshire Hathaway's Portfolio Invested in 3 Artificial Intelligence (AI) Stocks Heading Into 2026
- Warren Buffett Has 23% of Berkshire Hathaway's Portfolio Invested in 3 Artificial Intelligence (AI) Stocks Heading Into 2026
- Will BigBear.ai Stock Double in 2026?
- DT rewards another AI supplier with VC injection
- Could Vertiv become the next essential AI infrastructure stock?
- Samsung surpasses 2018 memory boom with strong AI chip sales
- Kodiak AI (NASDAQ:KDK) Trading Up 3.2%
- Why Alphabet Just Paid $4.75 Billion for Intersect -- and What It Means for the Future of Artificial Intelligence (AI)
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