U.S. trading margin debt soared by $57.2 billion in October 2025, reaching an unprecedented $1.2 trillion, according to Chainthink. This marks the sixth consecutive month of growth, with a year-to-date increase of $285 billion, or 32%. Over the past six months, margin debt surged by 39%, the largest rise since 2000, surpassing the 2021 meme stock surge. Margin debt, which reflects the total amount investors borrow from brokers to buy stocks or other securities, has been climbing steadily, amplifying both potential returns and risks for investors. This significant increase highlights the growing leverage in the market as investors seek to capitalize on market opportunities.