Zen has been ranked 44th in the Sunday Times' Top 100 Companies To Work For list, and also awarded a two-star Best Company rating for ‘outstanding' staff engagement.
Zen last entered the awards in 2016, placing at 56 in the Top 100.
Andrew Fryatt, Zen's MD for Residential and Small Business, said: "Our core long-term objectives will always remain happy staff, happy customers and happy suppliers, in that order. We value staff as our greatest asset and strive to make Zen a company they are happy and proud to work for."
After the company last entered the awards in 2016, a number of initiatives were put in place to help tackle issues thrown up by analysis of the staff survey.
They included a private healthcare plan, the ability to buy extra holidays and a quarterly reward scheme to recognise outstanding contributions from staff across the business.
"Those initiatives helped us to an even better result and a place in the top 50 this time, and once again every team in the business will be carefully looking through the results of the survey to see where improvements can be made," he said. "Those reports will be collated and we will then develop new initiatives to make Zen an even better place to work."
Jonathan Austin, Best Companies founder and chief executive officer, said: "This year, it is encouraging to see that more and more organisations are recognising the value of employee engagement and are willing to benchmark themselves against the best to ensure they are offering their employees the best possible experience."
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