Cannes Lions owner bought media consulting firm in 2017.
Total entries are down 6% on 2019 - but there has been a surge in entries from indie agencies and production companies.
"We are deeply committed to balancing the well-being of both our people and our clients during this challenging time."
News follows cancellation of MWC announced last week.
Revenue at Ascential's marketing division fell 8% in 2018, while Ebitda dropped by almost a fifth.
Clients have had to rely on multiple providers in the past for a complete picture of their online sales performance.
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