The provided search results do not contain specific information about Private Capital Limited with the URL http://www.private-capital.com.hk and LinkedIn URL http://www.linkedin.com/company/private-capital-limited. However, based on typical companies with similar names, private capital firms often provide investment services, focusing on private equity and venture capital. They typically target high-net-worth individuals, institutional investors, and businesses seeking capital. Their unique selling proposition (USP) might involve offering strategic investment advice and access to exclusive investment opportunities. Without specific details, this description is speculative.