While the Big Four audit firms continue to totally dominate the FTSE 100 audit market (see FTSE 100 auditors survey, p8, Nov 2017), it is easy to forget that their influence extends deep into the boardrooms of these companies as well. Exclusive research by Accountancy reveals that 61 out of the 100 audit committee chair positions in this highest level of corporate UK are held by someone who previously worked for at least one of these firms – Deloitte, EY, KPMG and PwC – or one of their predecessor firms.