The Comptroller-General of the agency, Muhammad Babandede, disclosed this at a news conference in Abuja on Friday.
According to him, the list of successful applicants will be published on the NIS’ website.
Mr Babandede said the NIS received a total of 334,554 applications for different positions, out of which 75,155 candidates made it to the next stage, which involved a computer-based aptitude test.
He said after aptitude test, only 6,105 applicants made it to the final stage.
He added that out of the figure, 4,120 applicants would be employed by the service after undergoing physical fitness examination and credential verification.
He said the agency had arrested some officials who demanded gratification and handed them over to the Independent Corrupt Practices and other Related Offences Commission (ICPC) for prosecution.
The Secretary of the Board, Aisha Rufai, said that every single condition for employment into the service was followed to arrive at the final list.
She reiterated that no financial gratification from anyone would be tolerated.
“I am glad to inform you that every single condition for employment into the service has be met,” she said.