InsidersTradesSigma
Instruments & Market Microstructure
The shortfall in execution price relative to a participation-rate-based benchmark due to market impact, adverse selection, and timing delays when an algorithm or trading desk executes a portion of parent order volume.
Participation rate slippage arises when an execution algorithm commits to trade a fixed percentage of market volume (say 20% of it) but meets deteriorating conditions, widening spreads, or its own market impact, pushing the average fill away from the benchmark. The faster you participate, the more you move the price against yourself, so the metric captures the core tension in execution: trade quickly and pay impact, or trade slowly and bear timing risk.
It is measured as the gap between the average execution price and the participation-rate benchmark, usually normalized by volatility so results compare across names. Read on its own it is a cost-of-trading diagnostic; persistently high slippage points to an order that was too large for available liquidity or an algorithm participating too aggressively.