The iBoxx EUR Corporates Investment Grade Spread Select Top 50% TCA Index measures the transaction cost-adjusted performance of investment grade, EUR-denominated corporate bonds. The index comprises bonds with a minimum amount outstanding of EUR 500 million for EUR-issued bonds and EUR 1 billion for legacy bonds converted from pre-EUR currencies. Bonds must have a minimum time to maturity of 18 months at issuance and 12 months at rebalancing. The index selects the top 50% of constituents from the iBoxx EUR Corporates based on benchmark spread, with issuer weight capped at 4.5%.