P3, the social inclusion charity, has topped the Sunday Times list of the 100 best medium-sized companies to work for.
The charity and social enterprise was named the best small company to work for by the newspaper in 2007. It is joined by several other third sector organisations in this year's medium-sized list.
Kent Union jumped from 80th in 2009 to 21st in the medium-sized list this year, and two social inclusion charities, Foundation and Fairbridge, entered the top 100 for the first time at 26th and 43rd respectively.
In the list of the best small companies to work for, Christians Against Poverty was knocked off the top spot after two years. It came in second behind IT company Softcat.
Julia's House, the children's hospice, came in at 18, and the St Giles Trust, the social inclusion charity, at 20.
Martin Kinsella, chief executive of P3, said the organisation was "immensely proud" to top the list.
"People who come to work for us do not want to make a million pounds or be the next X Factor winner, but to do something to make a difference," he said.
The lists are based on surveys of employees in organisations that apply to take part. They are asked to rate their workplaces in areas such as leadership, wellbeing, pay and benefits.