Some of the funds have a higher weighting to large aerospace and defence conglomerates London’s first space ETF, the Procure Space UCITS ETF (LON:YODA), is primed for takeoff this month but it is not the only one of its kind on the market. It is a sister fund to the first ever space ETF, the Procure Space ETF (NASDAQ:UFO), which in the US is up against two other passive funds focused on the space economy, the SPDR S&P Kensho Final Frontiers ETF (NYSEARCA:ROKT) and the ARK Space Exploration & Innovation ETF (BATS:ARKX). There are various similarities and differences between the three.