All quoted companies should seek to have a diverse range of investors on their share register. Typically, the majority will comprise a range of institutional investors who will invest according to a range of criteria, in the main dictated by the structure and requirements of the funds they manage. Institutions tend to be longer-term investors, whereas private investors, who will comprise the balance of the register, often have shorter-term aspirations. Private investor interests may be driven by changing sentiment towards industry sectors; perceived value opportunities (such as a valuation anomaly); by income (an attractive yield); or by tax-efficiency, although.