In respect of options granted during the financial year/period over listed securities, the listed issuer is encouraged to disclose in its annual report and half-year report the value of options granted to participants set out in (i) to (v) of rule 23.07 during the financial year/period, and the accounting policy adopted for the share options. Where the listed issuer considers that disclosure of value of options granted during the financial year/period is not appropriate, it must state the reason for such non-disclosure in its annual report or half-year report.
Note: In respect of the disclosure of the value of options in annual report or half-year report, the listed issuer should use the Black-Scholes options pricing model, the binomial model or a comparable generally accepted methodology to calculate the value of options. The listed issuer should also disclose, in the annual report or half-year report, the following information:
(1) a description of the model and significant assumptions used to estimate the value of the option, taking into account factors such as risk-free interest rate, expected life, expected volatility and expected dividend, if applicable;
(i) Where the calculation of the value is referable to a risk-free interest rate, such rate should be the rate prevailing on debt securities issued by the state, such as the Exchange Fund Notes in the case of Hong Kong based entities.
(ii) The listed issuer should set out the expected volatility used in calculating the value, with an explanation of any deviations from the historical volatility of the securities. The listed issuer may choose the period of time that it considers appropriate for calculating such historical volatility. However, such period may not be less than one year or, where securities have been listed for less than one year from the date of commencement of dealings in such securities, such period is to be from the date of commencement of such dealings to the date of the calculation.
(iii) Expected dividends should be based on historical dividends, with an explanation of any adjustments made for publicly available information indicating that future performance is reasonably expected to differ from past performance.
(2) the measurement date which should be the date on which the options were granted;
(3) the treatment of forfeiture prior to the expiry date; and
(4) a warning statement with regard to the subjectivity and uncertainty of the values of options to the effect that such values are subject to a number of assumptions and with regard to the limitation of the model.