Margin Debt Risk: The Ratios That Mislead Investors
Published on July 8, 2026
Rising prices increase the value of collateral in every margin account, which automatically increases how much each investor can borrow under Reg T. Debt rises BECAUSE the market rose, not the reverse. That single fact is what breaks the ratios we’re about to examine, and it lies at the core of why margin debt risk is so often misjudged.