Abstract: Although the focus of this issue is on investment in British industry and hence we are particularly concerned with debt and shares, the transactions and holdings in these cannot be separated from the range of other financial claims, including property, that are available to investors. In consequence this article focuses on an overview of the financial system including in Section 2 a presentation of the flow of funds matrix of the financial claims that make up the system. We also examine more closely the role of the financial institutions that are part of the system by utilising the sources and uses statements for three sectors, non‐bank financial institutions, personal sector and industrial and commercial companies. Then we provide, in Section 3, a discussion of the various financial claims investors can hold. In Section 4 we give a portrayal of the portfolio disposition of each of the major types of financial institution involved in the market for company securities specifically insurance companies (life and general), pension funds, unit and investment trusts, and in Section 4 a market study is performed for ordinary shares, debentures and preference shares for holdings, net acquisitions and purchases/sales. A review of some of the empirical evidence on the financial institutions is presented in Section 5 and Section 6 is by way of a conclusion. The data series extend in the main from 1966 to 1981, though at the time of writing, some 1981 data are still unavailable. In addition, the point needs to be made that the samples have been constantly revised so that care needs to be exercised in the use of the data.