Several law firms have conducted (and may still be conducting) two different series. These firms include Baker McKenzie (Brexit and cloud computing), Berwin Leighton (hotels, two different geographies), Clifford Chance (M&A and European debt), Freshfields Bruckhaus (corporate crises and whistle blowers), Herbert Smith (M&A and finance), Jackson Lewis (workplace and dress codes), Miller Chevalier (Latin American corruption and tax policy), and Morrison Foerster (legal industry and M&A).
A few firms have done (or may still be conducting) three surveys on different topics; CMS (the legal industry, Brexit, M&A in Europe), DLA Piper (compliance, debt in Europe, M&A), and Pinsent Masons (Brexit and two on construction in different geographies).
We can also look at the broad topics where one or more firms have coordinated a series of at least five years’ length. We have coded the particular topics into broader meta-topics. The next chart tells us that three meta-topics on industries are included in these long-running series: construction, real estate, and private equity. Second, firms have also run five-plus-year series on disputes (litigation, class actions, and arbitration). Finally, the most popular subject for research surveys has been mergers and acquisitions, with three different meta-topics.