DALLAS: The biggest leveraged buyout in history was notable not only for its finances, but also for its unusual feature of having multiple PR firms advising both sides of the deal simultaneously.

Texas-based energy company TXU agreed to a $45 billion buyout by the private equity firms Kolberg Kravis & Roberts (KKR) and Texas Pacific, along with Goldman Sachs, last week.

TXU worked with Public Strategies, its AOR, as well as Kekst & Co., on the deal. But Kekst also worked ...