Guy Spier's top holdings (April 2026) include Micron Technology Inc. (MU), a global leader in memory and storage solutions that produces DRAM and NAND flash products for various applications.

Guy Spier is an investor and author, best known as the founder and managing partner of Aquamarine Capital. His investment firm, based in Zurich, operates with a value investing approach, taking significant inspiration from the teachings of Benjamin Graham and Warren Buffett. Spier focuses on identifying businesses he believes are trading below their intrinsic value, holding them for the long term.

Micron Technology Inc. (MU)

Micron Technology Inc. is at the forefront of the semiconductor industry, specializing in innovative memory and storage solutions. The company designs, develops, and manufactures dynamic random access memory (DRAM), NAND flash, and other semiconductor technologies for use in data centers, mobile devices, client products, and embedded applications globally. Micron has a market capitalization of $402.85B, with Guy Spier's position currently valued at $67.53M. Analysts have set a price target of $362.21 for the company, and its discounted cash flow analysis suggests a value of $77.99 per share.
Here's an overview of Guy Spier's trades in Micron Technology Inc.:

American Express Co. (AXP)

American Express Co. operates as a globally integrated payments company, providing customers with access to products, insights, and experiences that enrich lives and build business success. Its core products include credit and charge cards, and it also offers a variety of financial management tools and travel services to individuals and businesses worldwide. The company's market cap stands at $201.33B, while the current value of Guy Spier's holding is $63.51M. A discounted cash flow analysis for American Express indicates a value of $380.32 per share, and analysts project a price target of $389.36.
Here's an overview of Guy Spier's trades in American Express Co.:

Berkshire Hathaway Inc. (BRK.B)

Berkshire Hathaway Inc. is a multinational conglomerate holding company overseen by Warren Buffett. The company owns a wide array of subsidiaries, including GEICO, BNSF Railway, and a significant portion of Dairy Queen, along with substantial equity investments in publicly traded companies. This holding in Guy Spier's portfolio is currently worth $57.05M. According to a discounted cash flow analysis, the company suggests a value of $455.49 per share.
Here's an overview of Guy Spier's trades in Berkshire Hathaway Inc.: [STOCKCIRCLE_EMBED_PLACEHOLDER_BRK.B]

Bank Of America Corp. (BAC)

Bank of America Corp. is one of the world's leading financial institutions, serving individual consumers, small and middle-market businesses, and large corporations with a full range of banking, investing, asset management, and other financial and risk management products and services. Its extensive network includes branches, ATMs, and digital banking platforms across the United States and internationally. Bank of America has a market capitalization of $343.0B, with Guy Spier's position currently valued at $37.43M. Analysts have set a price target of $61.2 for the company, and a discounted cash flow analysis suggests a value of $-3.72 per share.
Here's an overview of Guy Spier's trades in Bank Of America Corp.:

Mastercard Incorporated (MA)

Mastercard Incorporated is a global technology company focused on the payments industry. It connects consumers, financial institutions, merchants, governments, and businesses around the world, enabling secure and convenient electronic transactions. Mastercard's brand is widely recognized for its credit, debit, and prepaid card programs. The current value of Guy Spier's position in Mastercard is $32.86M, and the company's market cap is $432.15B. The discounted cash flow value for Mastercard is $589.13 per share, with analysts targeting a price of $661.08.
Here's an overview of Guy Spier's trades in Mastercard Incorporated: