When IPG entertainment firms BNC and PMK/HBH merge on January 1 to form PMK-BNC, it will create the largest firm specializing in PR, entertainment, and pop culture marketing, according to Michael Nyman, one of three new chairman and CEOs of the combined agency.

That proclamation is “based on what we know about the sectors we measured,” he added. Other sources agree. Nyman declined to confirm published reports that the agency's gross billings will be more than $65 million, but a source familiar ...