SJ Berwin is set to pursue its long-mooted U.S. merger with Proskauer Rose in a deal that would create a global top 30 law firm with combined revenues of more than £600 million.

As legalweek.com reported on May 6, Proskauer Rose had been identified as the sole potential U.S. suitor after Orrick Herrington & Sutcliffe, another firm that SJ Berwin had considered a deal with, last week ruled itself out.