His term will come to an end after the annual meeting next July and he said his decision to make the announcement now was to give the LSE enough time to find a suitable successor.
Cruickshank has been widely criticised during his time at the helm, with his support for the merger with the German bourse raising plenty of eyebrows through the city.
Harrison Beale & Owen will (HB&O) have a new chairman and managing director at the helm for 2017
Satvir Bungar promoted to managing director in the mergers and acquisitions team
Carolyn Brown appointed as the first head of client legal services practice RSM Legal
UK senior partner Phil Verity has been elected for a second term at Mazars