Independent investment bank Perella Weinberg Partners and Citigroup will share in as much as $US85 million in fees for advising on the deal, according to Jeffrey Nassof, director of consulting firm Freeman & Co.
Northrop will pay Perella Weinberg an estimated $US30 million to $US40 million, according to Nassof.
Citigroup will make an estimated $US35 million to $US45 million for advising Orbital, which generates $US4.5 billion in revenue thanks to lucrative contracts with NASA and the Army.
The deal is expected to close in the first half of 2018 and will create a company on pace for a combined $US30 billion in sales in 2017.
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