Guy Spier
32 posts
Guy Spier: Concentrated Value Investing Remains Core StrategyGuy Spier’s Aquamarine Zurich AG reported an equity portfolio of approximately $148 million in the latest quarter, maintaining its hallmark concentrated, Buffett-inspired long-t…
Why Guy Spier Is Returning Capital—and What It Means for InvestorsGuy Spier’s latest communication offers a rare investing perspective shaped not by market cycles but by personal realities. His explanation for returning outside capital is unus…
Guy Spier (Aquamarine Zurich AG) – Q3 2025 13F Portfolio ReviewIn the most recent 13F filing, Guy Spier’s Aquamarine Zurich AG reported a portfolio valued at $317.37 million, with the top five holdings accounting for 77.64 % of total assets…
Guy Spier: Is AI Killing the Investor’s Edge?The landscape of investing has been fundamentally reshaped, and for Guy Spier, the change is absolute. In his Bloomberg article, he reflects that for thirty years, his advantage…
Guy Spier: You Really Give Up A Lot By Trying To Find Cheap BusinessesIn a recent interview with The Investor’s Podcast, Guy Spier opened up about his philosophy—not just on investing, but on life. “I am alive,” he began with a smile, “and I’m gla…
Guy Spier: Why Investors Need To Resist The Urge To RebalanceIn this interview with Excess Returns, Guy Spier explains that in a randomly selected portfolio held over a long period, most returns come from a few big winners, while many sto…
Guy Spier: Why It’s Risky Not To Take RisksDuring his recent episode with The Investor’s Podcast, Guy Spier reflects on taking risks, particularly for young people in their twenties. He believes that this is the ideal ti…
Guy Spier: The Importance of Process Over Outcomes in InvestingIn this interview, Guy Spier discusses the importance of having a robust decision-making process when investing, as good processes can lead to bad results and vice versa due to …
Guy Spier: The Iceberg of Investment: Why Public Portfolios Don’t Tell the Whole StoryDuring this interview with RWH, Guy Spier makes that point that an investor’s success is influenced by factors beyond their talent or knowledge. Specifically, he highlights the …
Guy Spier: Warren Buffett On Does Investing Get Easier Over Time?During this interview with The Young Investors Podcast, Guy Spier discusses the difficulty of investing and how it’s comparable to other challenging pursuits, such as cycling. H…
Guy Spier: Warren Buffett Would Rather Read 10-Ks Than Marcel ProustIn this interview with The Compound, Guy Spier discusses Warren Buffett’s dedication to investing, and his ability to focus on financial matters while having little interest in …
Guy Spier: Listen To Charles Munger When It Comes To Trimming PositionsIn this interview with William Green, Guy Spier discusses the challenge of deciding whether to trim investments when the valuation of a position has greatly appreciated. Here’s …
Guy Spier: Take Calculated RisksDuring this interview with IWT, Guy Spier discusses taking calculated risks. Spier says it’s better to carefully walk down a path, even if you don’t know where it leads, than to…
Guy Spier: The Power Of Doing NothingIn this interview with Investing With Tom, Guy Spier discusses the power of doing nothing. Here’s an excerpt from the interview: Spier: Any case I couldn’t think of anything els…
Guy Spier: Warren Buffett’s Instincts Keep Him Out Of TroubleDuring his recent interview with Julia La Roche, Guy Spier explained how Warren Buffett’s instincts keep him out of trouble. Here’s an excerpt from the interview: Spier: It was …
Guy Spier: Warren Buffett Is Constantly Updating His Investing ModelsDuring his recent interview with Richard Hsu, Guy Spier explains how Warren Buffett’s is constantly updating his investing models. Here’s an excerpt from the interview: Spier: B…
Guy Spier: Investors Can Take Out Stupidity Insurance To Protect Their PortfolioDuring his recent interview with Excess Returns, Guy Spier explained how investors can take out stupidity insurance to protect their portfolio. Here’s an excerpt from the interv…
Guy Spier: What Warren Buffett Taught To Me About Managing DebtDuring his recent interview on the RWH Podcast, Guy Spier discussed what Warren Buffett taught him about managing debt. Here’s an excerpt from the interview: Spier: The only rea…