Core Insights - Warren Buffett acknowledges several investment mistakes throughout his career, emphasizing the importance of understanding economic dynamics and making timely decisions [5][15][23] Investment Mistakes and Lessons - **Amazon**: Buffett regrets not investing in Amazon earlier, recognizing the power of its business model and the missed opportunity [1][7] - **Berkshire Hathaway**: Initially invested in Berkshire Hathaway as a failing textile company, which he later regretted due to the vindictive nature of the decision that cost him significantly [2][3] - **Tech Stocks**: Buffett has historically avoided tech stocks due to a lack of understanding, particularly missing out on Google, which he later recognized as a mistake [7][8] - **US Airways**: The investment in US Airways did not yield significant appreciation, but Buffett managed to recover his principal and dividends [9][10] - **Waumbec Textile Company**: Buffett admitted that purchasing Waumbec was a poor decision, as it had to be shut down shortly after acquisition [12][13] - **Tesco**: Buffett's delayed decision to sell Tesco shares resulted in a substantial loss, highlighting the need for prompt action in investments [14][15] - **Energy Future Holdings**: A significant loss occurred due to a lack of consultation with partners before making a major investment decision [16][17] - **Lubrizol Corp.**: The acquisition was marred by insider trading issues, emphasizing the need for thorough due diligence [18][19] - **General Reinsurance**: The issuance of additional shares to finance the acquisition was seen as a mistake, which diluted shareholder value [20][21] - **ConocoPhillips**: Investing heavily at peak oil prices led to significant losses, underscoring the importance of consulting trusted advisors [22][23]