Index One is a UK-based technology firm offering a flexible and cost-effective index calculation platform. Designed to provide an alternative to traditional index providers such as FTSE, S&P, and MSCI, Index One enables users to build, test, and maintain custom indices tailored to specific strategies or market segments.

While the platform’s core client base includes ETF issuers and institutional investors, there is growing interest from discretionary fund managers (DFMs) and financial advisers—particularly those serving high-net-worth clients or seeking more control over benchmarking and portfolio construction.