They were the only accountancy firms featured on the annual list, which was topped by insurer Admiral Group and educational business Explore Learning.
The firms have slipped since last year, when EY placed 10th, and Deloitte in 13th, while phone company EE – which claimed the top spot – did not make the list at all this year.
Steve Varley, EY’s UK Chairman, said, “I am very proud to see EY named again as one of the UK’s best big companies to work for, especially given the benchmark is based on the views and opinions of our people.
“Each year we look for ways to improve the experience of our people, whilst they are with us. We aim to set new best practice in employee wellbeing and create an inclusive environment where our people feel they belong.”
Emma Codd, managing partner for talent at Deloitte, said, "We have worked hard to create an environment where our people feel they gain valuable experience and can learn and grow. It was great to be acknowledged by Best Companies for our continued progress."
Organisations must employ at least 3,000 full-time employees and achieve one of the 25-highest BCI scores to enter the list.
Among the 100 best mid companies were firms PKF Cooper Parry (13th), Bishop Fleming (66th), Price Bailey (92nd) and BHP Chartered Accountants (100th).
Last December, recruitment site Glassdoor revealed in its annual Employees’ Choice Awards that PwC was the only Big Four firm among the 50 best places to work in 2019.
It said PwC, Google and JP Morgan are the only three employers to have made the UK list every year.