Tracking Ron Baron's BAMCO Portfolio - Q4 2025 Update

2026-03-13 23:29:54 ET

This article is part of a series that provides an ongoing analysis of the changes made to BAMCO Inc.’s 13F stock portfolio on a quarterly basis. It is based on Ron Baron’s regulatory 13F Form filed on 02/17/2026. The 13F portfolio value decreased from $37.71B to $36.91B this quarter. The holdings are diversified, with recent 13F reports showing around 350 positions. There are 32 securities that are significantly large (more than ~0.5% of the portfolio each), and they are the focus of this article. The largest five stakes are Tesla Motors, Arch Capital Group, MSCI Inc., CoStar Group, and IDEXX Labs. They add up to ~30% of the portfolio. Please visit our Tracking Ron Baron’s BAMCO Portfolio series to get an idea of their investment philosophy and our last update for the fund’s moves during Q3 2025....

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