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In a historic achievement for technology giants, Alphabet (Google's parent company) became the fourth company worldwide to surpass a $4 trillion market capitalization on Monday, January 12, 2026. This milestone was driven by Apple’s announcement that it will use Google’s Gemini AI model to power the next generation of its Siri voice assistant, marking a major strategic shift for Apple and a clear recognition of Gemini’s technical superiority.

Landmark Partnership: Gemini Powers Siri

On Monday, Apple officially announced its selection of Google’s Gemini model as the core for its next-gen Siri, set to launch in 2026. This move departs from Apple’s traditional approach of developing AI technologies in-house and signals Gemini’s edge over competitors.

Analysts note Apple’s choice of Gemini over OpenAI’s ChatGPT or other AI models acknowledges Google’s advancements in AI - especially after the December 2025 launch of Gemini 3, which experts described as "superior to ChatGPT" in reasoning, programming, and multimedia understanding. Deepak Mathivanan of Wolfe Research stated in a January 8 note: "Google arguably has the strongest footprint across AI technology layers, thanks to a decade-long investment creating deep competitive moats."

Alphabet Surpasses $4 Trillion: Fourth Member of the Elite Club

With Monday’s market close, Alphabet’s market cap exceeded $4 trillion, making it the world’s second most valuable company after Nvidia ($4.5 trillion). This milestone places Alphabet in an exclusive club of just four companies ever to reach this level.

Nvidia first hit the $4 trillion mark on July 9, 2025, followed by Microsoft (briefly in July and again in October 2025) before dropping to $3.56 trillion. Apple reached $4.01 trillion on October 19, 2025, but has since slipped to $3.95 trillion. Now, Alphabet and Nvidia are the only giants maintaining their positions above $4 trillion, while Microsoft and Apple strive to regain momentum.

Exceptional Numbers: 65% Stock Surge in One Year

Alphabet’s break above $4 trillion followed a stellar 2025, with shares rising 65% - its strongest annual performance since 2009. Alphabet outpaced all Magnificent Seven tech peers, including Nvidia, which gained 39% over the same period.

Remarkably, 78% of Alphabet’s gains occurred in the second half of 2025, as its market cap leapt from $2 trillion in spring to $3.7 trillion at year-end. This rally followed early-year concerns over AI competitors like ChatGPT and social platforms eroding Google’s search dominance, and a major antitrust lawsuit from the US Department of Justice, which was ultimately dismissed, fueling a stock surge.

Gemini 3: Alphabet’s Secret Weapon

Much of Alphabet’s recent success is attributed to the launch of Gemini 3 in December 2025, Google’s latest generative AI model, which drew rave reviews for outperforming ChatGPT in reasoning and multimedia. In November 2025, Alphabet also unveiled Ironwood - its 7th-gen TPU AI chip - aiming to reduce reliance on Nvidia and build a proprietary AI infrastructure.

A recent Citi report named Google a top internet pick for 2026, praising its unmatched AI technology stack and decade-long R&D investments.

Financial Performance: First $100 Billion Revenue Quarter

Alphabet posted record results in 2025, with Q3 revenue topping $100 billion for the first time (up 16% year-over-year), 72% from advertising and $15.15 billion from Google Cloud. Net income for the first nine months of 2025 jumped 32% to $97.71 billion. For the full year ending September 2025, revenue reached $385.48 billion with $124.25 billion net income. CEO Sundar Pichai reported unprecedented cloud deals in 2025, reflecting surging demand for Google’s AI solutions.

Valuation: Cheap Compared to Peers

Despite its stock surge, Alphabet remains relatively cheap among the "Magnificent Seven," trading at a P/E of 32 - second only to Meta (28). Nvidia trades at 51 times forward earnings, and Apple at 37. Analysts see this as a margin of safety and project further upside, with a 12-month target price of $332 (+6%).

Apple: Lagging in the AI Race

Apple faces challenges in AI, ending 2025 with a modest 8% gain, lagging the S&P 500’s 17%. The launch of its next-gen AI-powered Siri was delayed to 2026, raising investor concerns. Raymond James downgraded Apple, citing difficulties ahead, and shares have fallen for seven consecutive sessions since December 30.

Apple’s reliance on Google’s Gemini for new Siri is seen as an implicit admission that its internal AI lags competitors. Its "Apple Intelligence" initiative has yet to meet expectations, with Siri still behind Google Assistant and Amazon Alexa.

Stock Performance Comparison: Alphabet Widens the Gap

Data: Yahoo Finance, CNBC, TradingView – January 12, 2026

Outlook: Alphabet Eyes $5 Trillion?

With current momentum and strong fundamentals, analysts believe Alphabet is well-positioned not only to retain its $4 trillion value but also to challenge Nvidia for the world’s most valuable company. Some optimistic projections see Alphabet reaching $5 trillion in 2026 if it maintains strong earnings and expands Gemini’s applications.

Growth drivers for 2026 include:

• Monetizing Gemini: Plans to show ads to Gemini’s 650 million monthly active users
• Google Cloud Growth: Continued expansion of billion-dollar enterprise deals
• Strategic Partnerships: The Apple-Siri deal could be the first of several such deals
• Ironwood Advancements: As its TPU chips mature, Google could reduce costs and boost margins

Alphabet will report full-year 2025 results in early February 2026. If results beat expectations, the stock could surge further, pushing the market cap toward $4.5 trillion or beyond.

Conclusion: A New Era for Alphabet

Alphabet’s crossing the $4 trillion mark is more than a record - it cements the company’s transformation from a search engine giant to a comprehensive AI powerhouse. The Apple partnership, once unthinkable between fierce rivals, signals industry-wide recognition of Google’s AI leadership.

While Apple and Microsoft strive to regain lost momentum, and Nvidia faces new challengers, Alphabet stands out with a diversified revenue base (search, ads, cloud, YouTube), reasonable valuation, and the industry’s strongest AI assets.

With upcoming earnings and new AI-driven products and services, $4 trillion may just be a waypoint on Alphabet’s journey to new heights. The question is no longer if Alphabet will keep its position, but when it might challenge Nvidia for the top spot.