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Key TakeawaysAlphabet closed up 10% at $384.80 on Thursday, adding $421 billion in market capitalization in a single session -- the second-largest single-day market cap gain in historyThe record is held by Nvidia, which added approximately $440 billion in a single day roughly a year ago following Trump's tariff suspension announcementAlphabet's stock is up 23% year-to-date, adding over $860 billion in market cap in 2026, bringing its total valuation to $4.65 trillionAlphabet is now within striking distance of overtaking Nvidia as the world's largest company by market cap, with Nvidia currently at $4.85 trillionAlphabet, Google's parent company, delivered one of the most extraordinary single-session market cap expansions in stock market history on Thursday, surging 10% to close at $384.80 and adding $421 billion in market capitalization in a single day -- the second-largest one-day market cap gain ever recorded.Only Nvidia has achieved a larger single-day market cap increase, adding approximately $440 billion in a single session roughly a year ago after President Trump announced a suspension of additional tariffs -- a move that sent semiconductor stocks surging globally.Thursday's Alphabet rally was driven by investor enthusiasm over the company's strong quarterly earnings, which showcased successful execution on its artificial intelligence strategy and solid revenue performance across its core advertising and cloud divisions. The results reinforced the view that Alphabet has navigated the AI transition more effectively than some peers, with Meta's simultaneous 8.6% decline -- driven by concerns over heavy AI capital expenditure -- highlighting the divergence in how markets are rewarding AI investment discipline versus AI spending excess.Alphabet Closes in on Nvidia's Top SpotThe single-session gain brings Alphabet's total market capitalization to approximately $4.65 trillion, up more than $860 billion year-to-date on a 23% stock price gain in 2026. The valuation now places Alphabet within $200 billion of Nvidia's $4.85 trillion market cap -- a gap that could close rapidly if AI earnings momentum continues to favor Alphabet or if any macro headwind pressures Nvidia's semiconductor-driven valuation.Crypto Market ContextFor Bitcoin and risk assets, Alphabet's historic session carries a constructive signal. A $421 billion single-day market cap expansion in a mega-cap tech stock reflects the depth of institutional capital available to flow into risk-on assets when earnings catalysts align. The AI investment thesis driving Alphabet's gains also supports the broader narrative around AI-related crypto tokens and infrastructure plays, while the record equity session reduces the near-term probability of a broader risk-off move that could drag Bitcoin below its $75,000 support zone.