Core Insights - Warren Buffett acknowledged a missed opportunity in not investing in Alphabet (GOOGL) earlier, attributing it to a lack of understanding of tech companies and their value proposition [1] - After eight years of hesitation, Berkshire Hathaway finally purchased shares of Alphabet in Q3, during which the stock rose 559% from Buffett's 2017 interview to the end of Q3 2025 [2] - Buffett's investment in Alphabet has become the 13th largest position in Berkshire Hathaway's portfolio, coinciding with Alphabet's new Search feature, AI Overview, attracting two billion monthly users [4] Group 1 - Buffett expressed regret for not recognizing Alphabet's potential earlier, especially given the significant revenue generated from clicks by Berkshire's insurance subsidiary, which paid $10 to $11 per click [6] - In a previous interview, Buffett reflected on his investment in IBM, indicating a shift in his valuation approach towards tech stocks and a cautious stance on investing in them without a clear competitive advantage [7] - Buffett's investment strategy emphasizes the importance of a business "moat," which he found in Apple's strong market position, contrasting it with his hesitance towards other tech stocks [8]