The percentage of trading profits the trader keeps. The remainder goes to the prop firm. Typical splits range from 50/50 to 95/5 in favor of the trader.
Profit splits vary significantly: FTMO starts at 80% (scaling to 90%), FundedNext offers up to 95%, The 5%ers starts at 50% but grows to 100%, and Apex gives 100% of the first $25K. When comparing firms, consider the effective split over time, not just the starting number. A firm offering 50% that scales to 100% may be more profitable long-term than one offering a flat 80%.