What do Cooley; Dentons; Fenwick & West; Gibson, Dunn & Crutcher; Latham & Watkins; and Sullivan & Worcester have in common? They each advise clients in the increasingly lucrative and still largely unregulated world of daily fantasy sports—and now they’ve got even more company.

Debevoise & Plimpton, Greenberg Traurig and Kirkland & Ellis entered the fray Wednesday as two leading companies in the burgeoning DFS industry came under increased scrutiny amid allegations of insider trading and a lack of transparency involving their employees, products and platforms. The New York Times reported Monday about a data leak showing early lineup information for DraftKings users that occurred a few days before a midlevel DraftKings content manager named Ethan Haskell won $350,000 in a contest on rival DFS site FanDuel. In DFS, players assemble fantasy sports teams of real athletes, but compete on a weekly or daily basis, rather than over an extended season.