Arnold & Porter and Kaye Scholer, two firms with declining revenue and profits last year, announced Thursday morning that they have agreed to combine by Jan. 1, 2017, and form Arnold & Porter Kaye Scholer.

The combined firm—the only union this year between Am Law 100 firms—will have about 1,000 lawyers across nine domestic and four international offices, the firms said. The union represents further consolidation among mid-size and large firms seeking to compete with global giants and to bulk up in critical and competitive legal markets.