Tom Gayner's Strategic Decisions: Exiting 3M Co and Adjusting His Portfolio

Written by Emily J. Thompson, Senior Investment Analyst

Source: Yahoo Finance

Updated: Oct 31 2025

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Source: Yahoo Finance

Tom Gayner's Investment Moves: In Q3 2025, Tom Gayner added three new stocks to his portfolio, including Canadian National Railway Co, Canadian Pacific Kansas City Ltd, and Exxon Mobil Corp, while also increasing stakes in 27 existing stocks, notably Franco-Nevada Corp and CSX Corp.
Exits and Reductions: Gayner completely exited 11 holdings, including 3M Co and O-I Glass Inc, and reduced positions in Archer-Daniels-Midland Co and IQVIA Holdings Inc, reflecting strategic adjustments in his investment approach.
Portfolio Composition: By the end of Q3 2025, Gayner's portfolio consisted of 129 stocks, with significant holdings in Berkshire Hathaway Inc, Alphabet Inc, and Amazon.com Inc, primarily concentrated in various industries such as Financial Services and Technology.
Investment Philosophy: Gayner's investment strategy emphasizes acquiring businesses with strong returns, capable management, growth opportunities, and fair pricing, aiming for long-term returns aligned with intrinsic value growth.

About the author

Emily J. Thompson

Emily J. Thompson, a Chartered Financial Analyst (CFA) with 12 years in investment research, graduated with honors from the Wharton School. Specializing in industrial and technology stocks, she provides in-depth analysis for Intellectia’s earnings and market brief reports.