source:[1] Warren Buffett's Berkshire Hathaway Just Revealed More Than a Billion Dollars in New Investments -- and This Steel-Manufacturer Is on the Short List | The Motley Fool (https://www.fool.com/investing/2025/09/13/war ...)[2] Berkshire Hathaway 13F Filing Reveals Warren Buffett's Secret Stock - Investopedia (https://www.investopedia.com/berkshire-hathaw ...)[3] Berkshire Hathaway takes new stakes in UnitedHealth, Nucor; pares back on Apple (https://vertexaisearch.cloud.google.com/groun ...)