.Warren Buffett's Berkshire Hathaway is today a $1 trillion business The Washington PostThese Asian firms in Buffett's Berkshire Hathaway collection have actually climbed, with one shooting up 30% CNBCWall Street simply provided Warren Buffett an early birthday gift: Berkshire Hathaway is now worth $1 trillion CNNHow Long it Took U.S. Firms to Reach a $1 Mountain Appraisal Visual CapitalistBerkshire Hathaway tops $1 mountain market hat for first time as Buffett increases BofA equity purchases Yahoo Finance.