"Revenue" normally means revenue arising from the principal activities of a company and does not include those items of revenue and gains that arise incidentally. In the case of any acquisition or disposal of assets (other than equity capital) through a non wholly-owned subsidiary, the revenue attributable to the assets being acquired or realised (and not the listed issuer's proportionate interest in such revenue) will form the numerator for the purpose of the revenue ratio (See also rule 19.17).