SJ Berwin LLP was a multinational law firm headquartered in London, United Kingdom. SJ Berwin merged with the Hong Kong-headquartered law firm King & Wood Mallesons on 1 November 2013, becoming the fourth member of its Swiss Verein structure. SJ Berwin's legal name immediately changed to "King & Wood Mallesons LLP", although King & Wood Mallesons traded as "King & Wood Mallesons SJ Berwin" in Europe and the Middle East for a transitional period. SJ Berwin was a member of the "Silver Circle" of leading UK law firms. In January 2017, King & Wood Mallesons went into administration, which to that point was the biggest UK law firm collapse.