Angela Anderson, Deborah Barnard, Andrew Briggs, David Gratton, Catherine Smith and Garry Wilkinson were among 48 members of staff at Duncan & Toplis to complete 25 or more years of service with the company.
The six people are all based at the Spalding office of the accountancy practice, while the others are spread across Lincolnshire.
The long-serving staff were recognised at a Duncan & Toplis team meeting at the Lincolnshire Showground.
Adrian Reynolds, managing director of chartered accountants and business advisers Duncan & Toplis, said: “We employ 350 staff in ten offices and it is outstanding that nearly 50 of our colleagues have completed a quarter of a century of service with us.
“The firm prides itself on maintaining employee satisfaction and the fact that so many staff have spent such a long period of their life working here is testament to our success in this area. We congratulate them and wish them many more happy years with us.”
Duncan & Toplis was named last month by Accountancy Age as one of the UK’s top ten employers in the accounting sector.
The 2015 Accountancy Age Best Employer Survey sets out to identify the best accounting firms to work for in the UK. The outright winner will be announced in November.