As at 24 July 2018, there were 124 academies that have been approved by Regional Schools Commissioners (RSC) to transfer to another trust.
Academies may transfer to other trusts in a range of circumstances. In some cases, RSCs may be intervening due to concerns about academy performance. In other cases, an academy may be moving trust as part of an agreed voluntary arrangement. Although transfers are agreed in principle, some may end up not going ahead for any number of reasons.
Information on transfers that have occurred during the financial years 2013-14 to 2017-18 is published here: https://www.gov.uk/government/statistics/academy-transfers-and-funding-england-financial-year-2017-to-2018.