Harland & Wolff, which owns the Belfast shipyard where the Titanic was built, has been rocked by a series of challenges this year.
Arun Raman, an accountant who trained with PricewaterhouseCoopers and Citibank N.A. in India, has been in post since 2019.
His resignation is the latest departure from the firm's board and follows the resignations of non executives Malcolm Groat, Sir Jonathon Band and Katya Zotova last month.
In recent months, Harland & Wolff has been hit by the loss of a UK government loan and a lucrative contract and has been unable to finalise its 2023 accounts on a going concern basis.
Work to complete its unpublished accounts has been suspended, with resources being focused on a process with financial adviser Rothschild & Co to identify a route forward that will maximise value for stakeholders and seek to preserve Harland & Wolff's core operations at its delivery centres in Belfast, Appledore, Methil and Arnish.
Harland & Wolff's former chief executive John Wood stepped down in July.
