The Welsh division of the mental health charity Mind has urged staff with concerns about bullying to come forward after multiple former staff members complained to the media of "a toxic culture".
Former members of staff at Mind Cymru have been quoted by the BBC and The Daily Telegraph, describing a culture of bullying at the charity.
Mind employs about 300 people across England and Wales, and a spokeswoman said that about 20 of those were on the Mind Cymru team.
In a statement, Paul Ward, Mind’s chief operating officer, said the charity was keen to get to the bottom of what had happened.
"We take the wellbeing of our staff very seriously and we are very saddened to hear that people who have worked for us feel they had a bad experience," he said. "We do not tolerate bullying and take any allegations extremely seriously.
"We always encourage anyone who has any concerns about bullying to report it, anonymously if they wish, and have clear management and HR processes in place to take action."
Ward said only one allegation of bullying had been made by a member of Mind Cymru staff in the previous two years, but after a "full and robust investigation" by HR and the senior team the allegation was not upheld.
"We are grateful that these issues have been brought to our attention and we are sorry if anyone has ever felt unable to share their concerns while employed by Mind," he said.
"We would urge them to reach out to us directly now. We are keen to get to the bottom of what has happened and make sure we are addressing any issues that might lead staff to feel unsupported."
The spokeswoman said anyone with concerns should contact the charity’s chair, Ryan Campbell, by emailing firstname.lastname@example.org.