Disclosure of beneficial ownership is a powerful mechanism for protection of the investors on the capital markets. Through the duty to disclose beneficial ownership issuers, being listed companies, and other participants on capital market (individual investors, institutional investors, competent...

For proper valuation of risk to which the portfolio of financial assets is exposed, it is necessary to forecast the second moments of financial time series, that is variabilities. The empirical investigations show that financia time series are heteroskedastic, i.e. their volatility is not...