Optimal Execution with Limit and Market Orders
Quantitative Finance, Volume 15, Issue 8, 2015
24 Pages Posted: 19 Feb 2014 Last revised: 1 Sep 2015
Date Written: November 20, 2014
Abstract
We develop an optimal execution policy for an investor seeking to execute a large order using limit and market orders. The investor solves the optimal policy considering different restrictions on volume of both types of orders and depth at which limit orders are posted. We show how the execution policies perform when targeting the volume schedule of the Almgren-Chriss execution strategy. The different strategies considered by the investor outperform the Almgren-Chriss price with an average savings per share of about one to two and a half times the spread. This improvement over Almgren-Chriss is due to the strategies benefiting from the optimal mix of limit orders, which earn the spread, and market orders, which keep the investor's inventory schedule on target.
Keywords: Algorithmic Trading, High Frequency Trading, Optimal Execution, Impulse Control
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