RT Generic T1 Modeling asset prices for algorithmic and high frequency trading A1 Cartea, Álvaro A1 Jaimungal, Sebastian AB Algorithmic Trading (AT) and High Frequency (HF) trading, which are responsible for over70% of US stocks trading volume, have greatly changed the microstructure dynamics of tick-by-tick stock data. In this paper we employ a hidden Markov model to examine how the intra-day dynamics of the stock market have changed, and how to use this information to develop tradingstrategies at ultra-high frequencies. In particular, we show how to employ our model to submit limit-orders to profit from the bid-ask spread and we also provide evidence of how HF tradersmay profit from liquidity incentives (liquidity rebates). We use data from February 2001 and February 2008 to show that while in 2001 the intra-day states with shortest average durations were also the ones with very few trades, in 2008 the vast majority of trades took place in thestates with shortest average durations. Moreover, in 2008 the fastest states have the smallest price impact as measured by the volatility of price innovations YR 2011 FD 2011-04-26 LK https://hdl.handle.net/10016/12142 UL https://hdl.handle.net/10016/12142 LA eng DS e-Archivo RD 1 sept. 2024