Work-Bench leads Petra Labs’ $5.2 million seed round

  • Work-Bench led Petra Labs’ $5.2 million seed financing, backing the New York-based startup focused on attribution for AI-driven search.
  • Petra Labs builds custom “last-mile” attribution models that link AI search visibility to client outcomes such as revenue or qualified pipeline.
  • The platform combines an attribution engine with large-scale LLM simulations and a classification layer tracking brand mentions and citation dynamics across models.
  • Petra Labs began as a fully managed AEO service, then productized its workflow into software for enterprise marketing teams.


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