Defense News cited a Wall Street Journal report that says both companies could unveil the transaction as early as Monday and estimates the deal to reach more than $7.8 billion in cash.
Byron Callan, a director at Capital Alpha Partners, said the potential deal could help Northrop tap Orbital ATKs knowledge and experience in electro-optical countermeasures and missiles.
Reuters also reported that the transactions final value could be worth more than $7.7 billion given Orbital ATKs $6.3 billion in stock value and $1.4 billion in long-term debt.
Callan added Orbital ATKs rocket motors could also broaden Northrops product offerings to the Defense Department.
Orbital ATKs 2016 financials noted the Dulles, Virginia-based aerospace and defense contractor has contracts with the U.S. Army and NASA and Reuters added such contracts would provide Northrop annual revenue worth more than $4.4 billion.