Partners at Hogan & Hartson and Lovells signed off on their megamerger in separate votes that ended at midnight on Monday. The move is one of the last big hurdles before the two firms officially set up shop, which is planned for May 1.

In spite of the vote, the two firms still have several issues to work out, including client conflicts, leadership details, and overlapping offices and practice areas. If successful, the merged firm will be called Hogan Lovells and with about 2,500 lawyers and roughly $1.9 billion in revenue will be just over the size of Skadden, Arps, Slate, Meagher & Flom and Jones Day.