The Death of PDT: How a Pending Rule Change Is Rewiring Active Trading

U.S. regulators proposed replacing the Pattern Day Trader (PDT) fixed $25,000 equity threshold with a risk-based Intraday Margin Standard (proposal advanced as of April 2026). The change would remove the 3-in-5 day-trade limit and shift to real-time, position-based margin monitoring (position size, volatility, intraday moves). Market impact: lower capital barriers could broaden retail intraday participation, lift trading volumes (including 0DTE activity), and improve liquidity in heavily traded names — benefiting exchanges and fintech brokers. However, it raises operational demands on brokerages (real-time risk systems, trade validation) and may increase short-term volatility and reflexive, self-reinforcing moves in momentum or small-cap stocks. Implementation will be phased as firms upgrade systems, generating a transition period with uneven trading conditions across platforms.