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Alaminos, David Salas-Compás, María Belén Alaminos, Estefanía 2025-10-17T10:49:38Z 2025-10-17T10:49:38Z 2025-08-05 Alaminos, D., Salas-Compás, M. B., & Alaminos, E. (2025). High-Frequency Trading, Short Squeeze and ARMA-GARCH-Fractal Neural Networks. Computational Economics, 1-58. https://hdl.handle.net/10630/40300 10.1007/s10614-025-11026-8 In recent years, short squeeze events, such as the GameStop case in early 2021, have gained prominence, highlighting the need for advanced analyses of such phenomena. While traditional econometric and neural network approaches have struggled with predictive accuracy, our study addresses these gaps by analyzing the GameStop short squeeze using high-frequency intraday market data. We propose a novel hybrid approach that integrates an Autoregressive Moving Average-General ized Autoregressive Conditional Heteroscedasticity model with Neural Networks, as well as exploiting fractal dynamics to capture multiscale temporal dependencies and hierarchical patterns in financial markets. This fractal framework effectively addresses the nonlinear and chaotic dynamics of the financial markets. Our meth ods deliver high predictive accuracy, with the ARMA-GARCH-Quantum approach standing out. This method highlights its greater adaptability and accuracy, proving the benefits of integrating fractal principles into predictive modeling. By enhancing adaptability and precision, this study contributes valuable tools for market forecast ing and risk management, aiding regulators and financial managers in monitoring and mitigating abnormal price movements that could distort markets or spark crises. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Fractales High-Frequency Trading, Short Squeeze and ARMA-GARCH Fractal Neural Networks journal article