The integrated agency, whose clients include Dairy Crest, Gillette, Disney and Palm, has achieved 47th position in the Sunday Times list, despite a restructuring that has seen its workforce shrink by a third to 88 this year.
It achieved the position because people working at Haygarth feel part of a vibrant team with an 85% positive score overall for questions on teamwork.
Colleagues feel like a family (86%), care for each other (88%) and are fun to work with (87%).
Last year Haygarth increased its charitable efforts raising more than £10,000 for Macmillan Cancer Support and achieving recognition from WorkPlace Giving UK.
Staff awarded it a 68% score for questions on Giving Something Back adding that it does not support causes just for good publicity (73%, the 11th highest score).
There is a green team, a "switch off" policy at the end of the day and almost 10% of employees use the cycle to work scheme.
The firm is run on sound moral principles (84%), senior managers live the company's values (84%) and share important information with staff (82%).
Sophie Daranyi, Haygarth CEO, said: "We're hugely proud of this award -- our whole ethos and business success is based on our talented staff and the fact that they've voted so positively for us for an unprecedented 4th year is just great.
"I think employee engagement and wellbeing will be paramount for all companies in what will no doubt be a challenging year for all."