During the period a large portion of our holdings in a number of companies were sold as a result of call option exercises on the back of share price strength. This included Macquarie Group, Commonwealth Bank, Westpac, National Australia Bank and JB Hi-Fi. We consider each of these companies to be high quality but expensive in terms of valuation, particularly the banks which are trading at historically high valuations. Therefore, we chose not to buy these stocks back following the option exercises. While we still have a position in these companies, our holdings are significantly lower today when compared with six and twelve months ago.
During the period we completely exited the position in Mineral Resources given the disappointing corporate governance practices that have emerged. We were also active sellers of our small remaining holdings in Ramsay Health Care and FINEOS Corporation, both of which have been disappointing investments.
The capital realised from the option exercises and active sales was primarily used to invest in what we consider to be high-quality companies trading at attractive prices. Some capital was also retained, meaning we have a higher cash balance compared to 12 months ago.
We took the opportunity during this period to significantly increase the size of both Rio Tinto and BHP in our portfolio due to their attractive valuations, particularly their high fully franked dividend yields. We judge these two large mining companies to be high quality in terms of their assets, management and balance sheets. Both of these companies have traditionally been core holdings for our portfolio. We also added to our holdings in Coles Group, Newmont Corporation, CSL, Woolworths Group, Woodside Energy Group, Cochlear and Transurban Group.
Ampol (formerly known as Caltex) was the only new holding added to the portfolio during the period. Ampol is Australia’s leading vertically integrated energy company. It operates businesses across convenience retail in Australia and New Zealand, as well as the refining, supply and marketing of fuel. We believe that Ampol is a better business today compared to five years ago. The earnings mix is better, the balance sheet is solid, the quality of the network has improved and the management team has demonstrated good capital allocation and discipline. Ampol primarily offers our portfolio an attractive level of dividend income, especially if trading conditions in its refining business improve from the current cyclically low levels.