Cross-border M&A deals reached an all-time high of $2.1 trillion in 2021. Many of these transactions were subjected to merger clearance proceedings in the US and/or abroad. As a result, an unprecedented number of US second requests, Canadian SIRs, and EC Phase II proceedings involved large volumes of documents in different languages. In the big data era, multilingual data sets are not just a nuisance; they’re a serious threat to substantial compliance given the expedited schedule of most merger review proceedings. With the right workflows and technology, however, the challenge presented by large, multilingual data sets can be surmounted without breaking the bank or jeopardizing compliance. This article reviews some of the relevant tradecraft.