Warren Buffett saw Google's promise but chose not to buy in at its IPO. That decision cost Berkshire Hathaway a rare shot at early tech profits-and Buffett later called it his biggest investing regret.
Warren Buffett's most expensive investing mistake wasn't a bad stock pick or a market crash. It was doing nothing. He passed on Google's IPO, even though he saw the company's strong business and profits. For someone who built Berkshire Hathaway into a trillion-dollar giant by spotting companies with lasting advantages, this missed chance stands out.
Buffett has always looked for companies with clear economic moats and fair prices. That approach helped Berkshire beat the S&P 500 for years. But sometimes, even the best investors get tripped up by their own rules. With Google, Berkshire's habit of avoiding early tech IPOs meant Buffett's insight never turned into an investment. Years later, he called this his biggest mistake.
By September 2026, Alphabet accounted for approximately 12.6% of Berkshire Hathaway's public equity portfolio, with the total position valued at around $37 billion after additional purchases.
He saw the value but didn't buy
Buffett didn't miss Google because he didn't understand it. He knew the business and saw its profits early. The real turning point came when GEICO, Berkshire's insurance arm, became a major advertiser on Google. That gave Buffett a close look at how deep Google's moat was-its grip on online ads and steady profits. Still, Berkshire didn't buy at the IPO. The company missed out on the huge growth that followed.
Buffett has made other mistakes, like buying ConocoPhillips at the top of the oil market in 2008 or using Berkshire stock to buy Dexter Shoe Company before a big rally. But the Google miss is different. This time, he had firsthand business insight but didn't act on it.
Berkshire finally moves into tech
For years, Berkshire Hathaway mostly stayed away from tech stocks. Buffett said they were too unpredictable and changed too fast. That caution kept Berkshire out of some tech busts, but it also meant missing early gains from big names. Berkshire didn't invest in Alphabet, Google's parent, until 2025. By then, Google's lead was clear, and the chance for huge returns was gone.
This change shows how Berkshire's thinking has shifted. As tech becomes more important in the world economy, even old-school value investors are rethinking their playbook. A Reuters financial review notes that 2026 was a turning point for Berkshire. Warren Buffett stepped down as CEO on January 1, handing the reins to Greg Abel. This leadership change locked in Berkshire's move toward more tech investments, including a $10 billion private placement in Alphabet-a bold move for a company that once avoided tech stocks.
Berkshire Hathaway's reluctance to invest in Google's 2004 IPO was consistent with Buffett's long-standing strategy of avoiding early tech IPOs and favoring businesses with predictable profits and low capital requirements.
What investors can learn from Buffett's hesitation
Buffett's open admission of his mistake is a reminder: spotting a great business isn't enough. Investors have to act on what they know, especially when they have unique insight or firsthand experience. Waiting too long can be costly, especially in fast-changing fields like tech.
Alphabet's market value has stayed near the top of the world's biggest public companies. That shows how much it grew after its IPO. Berkshire did buy in eventually, but the returns from an early investment would have been much bigger. This gap shows how timing and conviction matter in investing.
Many investors face the same struggle-how to balance caution with the need to grab good opportunities. As industry publications report, Buffett has always pushed for patience and discipline, especially when markets are rough. But his own Google story shows that even the most careful strategies can lead to regret if you don't act on what you know.
Buffett's idea of an economic moat is key to how he invests. A moat means a company can keep its edge over rivals and protect its profits and market share. Google's lead in search and ads built a moat that was clear to anyone paying attention. For investors, finding these moats can pay off-but only if you're willing to act before everyone else sees it.
