The construction services and support business said it received a formal notice that has been referred to the enforcement division of the Financial Conduct Authority (FCA) for an investigation, in relation to its handling of inside information.
The investigation will also look into Interserve’s market disclosures relating to its exit from its energy-from-waste business between July 2016 and February 2017.
Interserve said it will “co-operate fully” with the investigation and update the market on the outcome.
The FCA declined to comment.
Following the collapse of construction company Carillion, the government asked Deloitte to advise on public sector contracts held by Interserve back in February.
Then in March this year, the company agreed a deal with its lenders, securing its short-term survival.
It announced it had agreed “in principle” to new terms that – subject to credit approval – would provide new cash facilities of £196.6m and bonding facilities of £95m. The deal meant the company now had cash borrowing facilities of £834m until September 2021, subject to step-downs.