States Services Commissioner Iain Rennie says no other complaints were made about Cera boss Roger Sutton during a seven-week investigation.
Mr Sutton resigned yesterday after a complaint that he harassed a senior female staff member by giving hugs and making inappropriate jokes and comments.
Mr Rennie would not confirm to Campbell Live that the complaint had been corroborated, but said evidence from witnesses helped the investigation into an allegation of sexual harassment.
"The bulk of the complaint has been upheld, the behaviour was of serious misconduct," he said.
Mr Rennie said he had contacted the complainant yesterday.