THE Big Four accountancy giants have maintained their stranglehold on the biggest audits according to a report which will likely stoke calls for the Government to do more to boost competition in the sector. The regulator found the four members of the grouping – Deloitte, EY, KPMG and PwC – audited all the members of the FTSE 100 elite for the third year running in 2020. The Financial Reporting Council found that so-called challenger audit firms increased their share of FTSE 250 audits, to 7.6 per cent, from 4.8%. Chief executive Sir Jon Thompson said it was encouraging that challenger firms had increased their share of the audit market covering the biggest 350 FTSE members.