Three main types are SICAVs, unit trusts, and OEICs, often structured as UCITS funds, UCITS allows cross-border sales within the EU, Luxembourg is a significant center for European funds, SICAVs are open-ended, single-priced, and often structured as umbrella funds, unit trusts are based on a trust structure and are dual-priced, OEICs, also known as VCCs in Ireland, operate with an authorized corporate director and a depository, can be single- or dual-priced, "Umbrella Funds" are a type of investment fund that encompasses multiple sub-funds or portfolios under a single overarching structure