Guy Spier

Founder and managing partner of Aquamarine Fund, recognized for his value investing approach influenced by Warren Buffett and his focus on long-term capital appreciation.

Explore Guy Spier's largest investments on Profit.com, including companies like Berkshire Hathaway Inc, American Express Company, and Bank of America Corp, and their significance in his portfolio.

Guy Spier’s portfolio updates are typically published quarterly through SEC 13F filings, which provide detailed information about their holdings, including recent buys and sells. Additionally, real-time updates on insider trades are available through Form 4 filings, offering a more timely view of their trading activity.

Guy Spier currently invests in companies such as Berkshire Hathaway Inc, American Express Company, and Bank of America Corp, focusing on sectors like Financial Services and Consumer Cyclical.

The largest holding in Guy Spier’s portfolio is Berkshire Hathaway Inc, accounting for 22.55% of their total investments.

One of Guy Spier’s most profitable investments is Micron Technology Inc, which has generated a return of 179.28% over the past year.

As of 15 Apr 2026, Guy Spier’s portfolio is valued at approximately $170.23M, based on the latest filings available on Profit.com.

Yes, you can use Profit.com to follow Guy Spier’s portfolio and gain insights to build your own investment portfolio.

You can follow Guy Spier’s portfolio updates on Profit.com, which provides notifications on the latest portfolio transactions as soon as they’re available.

Stay up-to-date with Guy Spier’s latest trades by following their portfolio on Profit.com. Enable notifications to receive real-time alerts on their newest buy and sell transactions.