The FTSE® 250 Source ETF aims to provide the performance of the FTSE® 250 TR Index. The FTSE® 250 TR is a capitalisation-weighted index of the 250 most highly capitalised companies, after excluding the FTSE® 100, traded on the London Stock Exchange. Those 250 companies represent approximately 15% of the UK market capitalisation. The starting base value was set at the FTSE 100 closing value of 1412.60 as of December 31, 1985.