Tracking Ron Baron's BAMCO Portfolio - Q4 2025 Update

John Vincent26.08K FollowersFollow5ShareSavePlay(17min)CommentsSummaryRon Baron's BAMCO Inc. 13F portfolio decreased to $36.91B, with Tesla, Arch Capital, MSCI, CoStar, and Idexx Labs as top holdings.Significant stake increases occurred in MSCI, FactSet Research, Choice Hotels, and several growth-oriented names, reflecting a continued long-term growth focus.TSLA remains the largest position at 14.53% despite ongoing trimming, with a cost basis of ~$14.50 and a strong long-term bullish stance.Baron continues to harvest gains in mature positions like Mettler Toledo and Vail Resorts while adding to high-conviction growth holdings. tang90246/iStock via Getty Images 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 FormThis article was written byJohn Vincent26.08K FollowersFollowFocused on analyzing 13F reports & building tools to help DIY investors generate absolute returns through exploiting inefficiency, volatility, and momentum.

Asymmetric Bets Focus. Broader commentary for DIY investors at Substack: https://diyabsolutereturns.substack.com/ . Check out my books in the Demystifying Web3 and Beyond series: 1. Demystifying Bitcoin: Paving the Way to Global Digital Money.2. Demystifying Crypto: Powering a Borderless Digital Economy.Analyst’s Disclosure: I/we have a beneficial long position in the shares of BPTRX, TSLA, FDS, NVDA, AMZN either through stock ownership, options, or other derivatives. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it (other than from Seeking Alpha). I have no business relationship with any company whose stock is mentioned in this article. Seeking Alpha's Disclosure: Past performance is no guarantee of future results. No recommendation or advice is being given as to whether any investment is suitable for a particular investor. Any views or opinions expressed above may not reflect those of Seeking Alpha as a whole. Seeking Alpha is not a licensed securities dealer, broker or US investment adviser or investment bank. Our analysts are third party authors that include both professional investors and individual investors who may not be licensed or certified by any institute or regulatory body.