Thesis (MBA (Business Management))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: Market capitalisation is a measure of size and prestige for various JSE listed companies. Changes in the Companies Act in relation to the capital maintenance provided companies the opportunity to repurchase their own shares. South Africa’s legislation is different to those of its international peers which resulted in a different interpretation of how to deal with treasury shares and resultantly impacted on the valuation of market capitalisation. This study was undertaken with the aim of establishing if there are differences in the reporting of closing balances of the number of shares of the company and group as provided by the share analysis section of the annual financial reports which is required by the JSE Listing Requirements. Thirty-four companies were selected specifically, analysed and compared to information as per the University of Stellenbosch Business School share program to determine whether differences arise and to determine the impact that this has on the market capitalisation valuation and explanations for deviations. The results reflected that the non reconciliation of closing balances of the group was primarily due to the non consolidation of trusts, subsidiaries and treasury shares and companies not adhering to the listing requirements as per section 3.3 of the shareholders’ spread to adequately disclose treasury related transactions. The study also found ambiguity in accounting standards IAS 1 in that they did not provide conclusive guidance in terms of the disclosure of share movements in rand value and units to reconcile between opening and closing balances of all treasury shares. Changes in the tax legislation will in future negate the reason for share repurchases through the subsidiaries or trusts which will have an impact on the reconciliation process going forward. Ultimately the accounting profession and JSE will have to implement standardised guidelines to ensure that the reporting of treasury shares is simplified to ensure that market users’ understanding of treasury activities and market capitalisation valuation can be improved.