Multi-day Executions

Abstract

Asset managers often have to spread their order executions over several days to minimize liquidity impact. In this paper, we present a framework for evaluating multi-day execution strategies and use a sample of multi-day agency executions to quantify the trade-offs. Our analysis shows that for volatile stocks and/or long execution horizons, execution risk can easily overwhelm all other considerations. For stocks with daily close-to-close volatility of 3%, for example, the five-day execution risk is 400 basis points. The evidence from our sample of multi-day executions suggests that for daily executions up to 15% average daily volume and up to five-day execution horizons, cross-day impact persistence and information leakage are relatively small: the impact cost of selling 15 million shares over five days, for example, is only slightly higher than the impact cost of selling 3 million shares over one day. Our multi-day executions, however, have high 50 basis points short-term alpha. This high alpha raises the cost of spreading execution across days.

TOPICS: Equity portfolio management, risk management