No abstract

Algorithmic trading is the subject of criticism mostly from low frequency traders and long-term institutional investors. Advocates of this trading mechanism claim that it has large positive influence on the market, such as liquidity growth by lowering spreads. This paper is focused on testing the relationship between market liquidity of shares traded on German Stock Exchange and HFT activity. Author proposes own methodology for measuring dynamics in HFT activity. Econometrical methods for panel regression are used to determine these relations. Results of this paper confirm the relevance of the HFT trader's main argument about creating liquidity.

HRUŠKA JURAJ. 2015. Delta-gamma-theta Hedging of Crude Oil Asian Options. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(6): 1897-1903. Since Black-Scholes formula was derived, many methods have been suggested for vanilla as well as exotic options pricing. More of investing and hedging strategies have been developed based on these pricing models. Goal of this paper is to derive delta-gamma-theta hedging strategy for Asian options and compere its effi ciency with gamma-delta-theta hedging combined with predictive model. Fixed strike Asian options are type of exotic options, whose special feature is that payoff is calculated from the diff erence of average market price and strike price for call options and vice versa for the put options. Methods of stochastic analysis are used to determine deltas, gammas and thetas of Asian options. Asian options are cheaper than vanilla options and therefore they are more suitable for precise portfolio creation. On the other hand their deltas are also smaller as well as profi ts. That means that they are also less risky and more suitable for hedging. Results, conducted on chosen commodity, confi rm better feasibility of Asian options compering with vanilla options in sense of gamma hedging.

HRUŠKA JURAJ. 2016. Aggressive and Defensive High-Frequency Trading and its Impact on Liquidity of German Stock Market. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 64(6): 1911Brunensis, 64(6): -1918 Algorithmic trading and especially high frequency trading is the concern of the current research studies as well as legislative authorities. It is also the subject of criticism mostly from low frequency traders and long-term institutional investors. This is due to several cases of market manipulation and flash crashes in the previous years. Advocates of this trading mechanism claim that it has large positive influence on the market, such as liquidity growth by lowering spreads and others. This paper is focused on testing the relationship between market liquidity of shares traded on Frankfurt Stock Exchange and HFT activity on European stock markets. Author proposes own methodology for measuring dynamics in HFT activity, without knowledge of original market messages. Liquidity is measured by various from of price spreads. Econometrical methods for panel regression are used to determine these relations. Results of this paper will reveal the relevance of the HFT trader's main argument about creating liquidity and hence reducing market risks related with high spreads and low number of limit orders.

HRUŠKA JURAJ. 2015. Delta-gamma-theta Hedging of Crude Oil Asian Options. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(6): 1897-1903 Since Black-Scholes formula was derived, many methods have been suggested for vanilla as well as exotic options pricing. More of investing and hedging strategies have been developed based on these pricing models. Goal of this paper is to derive delta-gamma-theta hedging strategy for Asian options and compere its effi ciency with gamma-delta-theta hedging combined with predictive model. Fixed strike Asian options are type of exotic options, whose special feature is that payoff is calculated from the diff erence of average market price and strike price for call options and vice versa for the put options. Methods of stochastic analysis are used to determine deltas, gammas and thetas of Asian options. Asian options are cheaper than vanilla options and therefore they are more suitable for precise portfolio creation. On the other hand their deltas are also smaller as well as profi ts. That means that they are also less risky and more suitable for hedging. Results, conducted on chosen commodity, confi rm better feasibility of Asian options compering with vanilla options in sense of gamma hedging.