This is the third time in a month that the court has extended the protection to the Chidambarams.
The court had issued a similar order on February 18, extending the protection till March 8 which was later extended till March 25.
The Central Bureau of Investigation (CBI) and the Enforcement Directorate (ED) are probing how Karti Chidambaram got clearance from the Foreign Investment Promotion Board (FIPB) for the Aircel-Maxis deal in 2006 when his father was the Union Finance Minister.
The ED on October 25, 2018, had filed a chargesheet naming him and a few others in the case.
Last July, the CBI had filed another chargesheet against 18 persons.