The Big Four Give Way to Mid-Range Auditors. Deloitte Fades Away on the WSE

Recent years have seen major changes in the market for auditing listed companies. Mid-sized auditors have increased their share (based on the number of companies audited) from 22% in 2015 to 58% in 2024, according to the latest report by Grant Thornton.

Meanwhile, the combined share of the Big Four (Deloitte, EY, KPMG and PwC) fell from 37% to 22%.