AI boom boosts Alphabet, Nvidia as bubble fears temper Big Tech gains

Alphabet GOOGL.O shares surge ~66% this year, largely on Gemini 3 that launched to much fanfare, sparking competition concerns at ChatGPT maker OpenAI

Nvidia NVDA.O shares up ~40% in 2025 as gains extend on still-tight supply of AI-chips for data centers, though stock's growth cooled from last year due to concerns around potential AI bubble

NVDA became first publicly traded co to cross $5 trillion mark in October

Microsoft MSFT.O shares gain ~16% this year on growing monetization of AI and cloud revenue, but growth was tempered by forecasts for heavy AI-related capital spending

MSFT hit $4 trillion valuation in July, becoming the second publicly traded company, after NVDA to cross milestone

Meta shares up ~14% in 2025 as AI-driven ad targeting lifted revenue growth, driving stock to its highest level in August. However, concerns around bond issuance to fund investments tempered growth

Apple AAPL.O shares gained ~9% this year making it among worst-performing stocks in "Magnificent Seven", pressured by tariff costs and delays to long-awaited AI features for its devices, co became third to hit the $4 trillion market value milestone

Amazon AMZN.O shares up ~6% in 2025, making it worst-performing "Magnificent Seven" stock, as investors worried about tariffs impacting its retail business and MSFT's Azure and Google Cloud taking market share in cloud sector

Global X Artificial Intelligence and Technology ETF AIQ.O rose ~33%, outperforming S&P 500's .SPX ~17% gains this year