David Gardner, head of EMEA sales and BlackRock's iShares veteran, is set to retire after 12 years.
Barclays has appointed Rory Tobin, former head of iShares International, to work on reviewing the group's asset management arm.
BlackRock's iShares has launched the first ETF to offer exposure to global AAA and AA rated government bond exposure.
BlackRock's ETF arm iShares plans to hire at least six people for its UK-based business to prepare for RDR next January.
BlackRock, the world's largest money manager, has reported its profits fell 11% in the second quarter, as the global downturn in markets cut into fee income.