In a petition to the Chairman of the Code of Conduct Bureau, and signed by the CSNAC Chairman Olanrewaju Suraju, the group said the alleged linkage of Mr. Mark, to at least eight offshore shell companies while holding public office in violation of the federal code of conduct laws. The discovery was made by the major international leak of financial documents from Panamanian law firm Mossack Fonseca.
According to the Premium Times, "as a former senate president, Mr. Mark stands out among other notable Nigerians named in the files." The paper further averred, "the 68-year old former military officer spent the last 40 years covered by the investigation largely as public office holder. But he is widely seen to be far richer than his legitimate incomes could have provided."
Senator Mark is Nigeria’s immediate past Senate President and current Senator representing Benue South senatorial district of Benue State and he has been in the senate since 1999.