The Holmes Report and ICCO are have extended the final deadline for the 2015 World PR Report to 3 April.

The key global PR industry study has already attracted almost 300 submissions from agencies across the globe. The survey ranks the world's biggest PR agencies and identifies critical communications trends and issues.

Firms seeking to participate in the ranking or provide information for the report can take the online survey here, which is this year being powered by Newlio. Alternatively, you can download the survey here and return to us by 3 April 2015.

ENTER THE 2015 WORLD PR REPORT SURVEY

The information gathered in this survey will be used to compile the annual list of the 250 largest PR firms in the world, which serves as the basis for an estimate of the size and growth of the public relations industry globally.

It will also form the basis of the 2015 World PR Report, produced in collaboration with ICCO.

Last year's Report found a PR agency industry that had returned to double-digit growth, reaching approximately $12.5bn in fee income.

The study found a rebound in optimism as marketers increased their PR budgets and digital and social media continue to power industry growth. Talent emerged as the global PR industry's biggest challenge, outstripping economic conditions, and pointing to the shifting skillsets required of today's PR professional. ​