Alphabet stock has more than doubled in value over the past year, but major investors are taking opposite approaches.

Berkshire Hathaway tripled its stake in the Google parent during the first quarter, while Bill Ackman's Pershing Square slashed its position by 95%.

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Berkshire's Big Bet on Alphabet

Berkshire Hathaway revealed in a regulatory filing on Friday that it tripled its Alphabet holdings in the first quarter.

The value of its Alphabet investments stood at over $16.6 billion at the end of March, making it the firm's seventh-largest holding.

This move came just before Alphabet shares surged further.

The stock has risen about 140% over the past 12 months and about 30% year-to-date, making it the best performer among the Magnificent Seven.

Pershing Square's Opposite Move

Meanwhile, Pershing Square sold 95% of its Alphabet stock during the quarter.

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The stake, which was the firm's fourth largest and worth over $2.1 billion at the end of 2025, totaled just $99 million at the end of March, becoming its second-smallest position.

Ackman clarified on X that the sale "was not a bet against the company. We are very bullish long term on Alphabet.

But at current valuations and in light of our finite capital base, we used [Alphabet] as a source of funds" to buy another Big Tech company.

Pershing Square on Friday revealed a new stake in Microsoft worth about $2.1 billion at the end of the quarter.

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Microsoft has been the laggard of the Magnificent Seven this year, with its stock down more than 12% since the start of 2026.

Ackman attributed Microsoft's underperformance to two erroneous investor concerns, though he did not specify them in his posts.

Alphabet's recent gains have been fueled by the popularity of its Gemini chatbot, investments in custom AI chips, and its booming cloud computing business.

As of Monday, Alphabet was America's second-most valuable company, with a market capitalization of nearly $5 trillion.

The divergence in strategy between Berkshire and Pershing Square highlights the differing views on Alphabet's valuation.

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While Berkshire sees long-term value, Pershing Square chose to reallocate capital to Microsoft, which it believes offers a better risk-reward profile at current levels.