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A GARCH model with two volatility components and two driving factors

Author

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  • Ballestra, Luca Vincenzo
  • D’Innocenzo, Enzo
  • Tezza, Christian

Abstract

We introduce a novel GARCH model that integrates two sources of uncertainty to better capture the rich, multi-component dynamics often observed in the volatility of financial assets. This model provides a quasi closed-form representation of the characteristic function for future log-returns, from which semi-analytical formulas for option pricing can be derived. A theoretical analysis is conducted to establish sufficient conditions for strict stationarity and geometric ergodicity, while also obtaining the continuous-time diffusion limit of the model. Empirical evaluations, conducted both in-sample and out-of-sample using S&P500 time series data, show that our model outperforms widely used single-factor models in predicting returns and option prices. The code for estimating the model, as well as for computing option prices, is made accessible in MATLAB language.11The model code is available at the GitHub repository: github.com/tezzachris/GARCH.

Suggested Citation

  • Ballestra, Luca Vincenzo & D’Innocenzo, Enzo & Tezza, Christian, 2026. "A GARCH model with two volatility components and two driving factors," Journal of Empirical Finance, Elsevier, vol. 85(C).
    • Handle: RePEc:eee:empfin:v:85:y:2026:i:c:s0927539825000933
    DOI: 10.1016/j.jempfin.2025.101671
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