SE10 has become the 100th name to sign up to the drive, with other consultancies to pledge support recently including Tetra Strategy, Westminster Advisers, JFL and Hopscotch Consulting.
The PRCA and PRWeek launched the campaign in October 2011.
PRCA director general Francis Ingham said: ‘It has been a real pleasure to see our members changing their policies over the last two years, and this continues to be hugely important for the industry’s hopes of increasing diversity.’
A number of the most recent signatories said that they already paid their interns.
Tetra Strategy senior account manager Charlie Collins said it had been paying interns for some time.
SE10 senior account executive Chloe Doyle added that the agency paid interns £70 a day, which is well above the minimum wage. ‘It’s a benefit to the business,’ she said. ‘People start with us as interns and then work their way up. ‘It’s a good way of getting really good people.’
Westminster Advisers managing director Dominic Church said that in the past, the agency had paid expenses only and that attracted interns from wealthy backgrounds.
‘We want to make sure we reach people who don’t have that family backing to do an unpaid internship,’ he said. ‘It is partly self-interest, because we want to make sure we get the best people.’
The news comes as the chair of the Stephen Lawrence Trust called on the PR industry to address the under-representation of minority groups.
Writing an exclusive column for PRWeek, Symon Sentain said: ‘If we can help PR leaders increase the diversity of their workforce the impact will resonate across the corporate world.’