Backlog is the most quoted number in defense, and the most misread. Northrop Grumman's 2019 Form 10-K defines it plainly: backlog 'represents the future sales we expect to recognize on firm orders,' and the filing splits it into funded and unfunded components. The distinction is the whole game. Funded backlog is the slice for which appropriations have been made and dollars obligated; unfunded backlog is firm orders that are authorized but not yet appropriated.
For an analyst, that means a single headline backlog figure can flatter near-term revenue. A large unfunded balance signals demand and program continuity, but it converts to sales only as Congress appropriates and the customer obligates funds. Northrop reports both numbers precisely because they answer different questions: funded backlog tells you what is contracted and paid for; total backlog tells you the size of the runway.
The structural read is that Northrop's business is concentrated in long programs — aircraft, defense systems and space — where multi-year awards build a deep unfunded tail. That tail is real, but it carries appropriations risk that the funded portion does not. The disciplined framing: book-to-bill direction and the funded share of backlog matter more than the gross total when judging the next several quarters.
Watch the funded-to-total ratio over time. A rising total backlog with a flat funded share is a demand story without a near-term revenue story; a rising funded share is the signal that appropriated money is catching up to authorized intent. Filing on sec.gov; index via EdgarBeast.