NORTHROP GRUMMAN CORP /DE/ (NOC) stock intrinsic value fair value estimate & owner earnings analysis

Northrop Grumman is one of a small handful of prime contractors the U.S. government relies on to build its most strategically important weapons systems. About 86% of 2025 sales were booked in the United States, primarily to the U.S. Department of War (formerly the Department of Defense) and the intelligence community; most of the remainder came from allied governments in Europe (8%) and Asia/Pacific (4%). The company runs four segments: Aeronautics Systems (aircraft, including the new B-21 Raider bomber and F-35 work), Defense Systems (missiles and the Sentinel intercontinental ballistic missile program), Mission Systems (radar, sensors, C4ISR), and Space Systems (satellites and restricted space programs). We measured owner earnings - cash generated by the business after stock-based compensation and the capital spending needed just to maintain (not grow) its asset base - for each of the last ten years, and used the median of the last seven (2019 through 2025) as the anchor for this valuation. We excluded 2016-2018 because the business changed materially over that stretch: Northrop acquired Orbital ATK in mid-2018, adding an entire new space and missile-products segment. The remaining seven years span both a full year of the now-divested IT Services business (sold in 2021) and the current four-segment structure, giving a fuller picture of typical cash generation than any single recent year, which swings meaningfully with the timing of government billings. On this basis, owner earnings per share have run from about $11.67 to $23.12 a year over that window, with a median of about $16.03. For context, owner earnings grew about 30% in 2025 versus 2024 - but that was driven mostly by lower capital spending and modest working-capital timing, not by a step-change in the underlying business, so we assumed meaningfully slower growth (about 6% in the first year of our forecast) going forward rather than extrapolating the recent jump. Two accounting judgments matter here. First, Northrop's cash flow statement bundles depreciation, pension mark-to-market adjustments, deferred taxes and other non-cash items into a single "non-cash items" line; we relied on the company's own reconciliation of net earnings to operating cash flow (which ties to the penny each year) rather than trying to rebuild that bundle from scratch. Second, the company carries a large, well-funded pension plan; cash pension contributions in excess of pension expense flow through operating cash flow as a real, recurring cost and we left them in place - they are not a working-capital timing item to be added back, unlike the swings in receivables, inventory and payables (trade working capital), which we did strip out so a single good or bad billing quarter doesn't move the anchor. What we assumed for each case: Bear case: the two flagship next-generation programs already show real execution risk. The B-21 Raider bomber - built under fixed-price low-rate-production contracts - has taken two loss provisions in the last two years ($1.56 billion in Q4 2023 and $477 million in Q1 2025), and $1.3 billion of loss reserve remains on the books at the end of 2025; a third such charge on the remaining LRIP lots is a real possibility. Separately, the Sentinel missile program has already gone through a formal cost-overrun review (a "Nunn-McCurdy" breach) in 2024, and the pricing for its next contract phase has not yet been negotiated. Layer on roughly $15.7 billion of debt, and a period of muted growth (call it 1-2% a year) with periodic charges eating into cash flow is a realistic downside. In this case we estimate the shares are worth around $287. Base case: revenue growth moderates from the mid-single digits toward 3% a year as the $95.7 billion order backlog (2.3 times a year's revenue, and itself up 5% in 2025) converts into deliveries, with margins improving gradually as the B-21 and Sentinel programs move past their loss-making early production phases into steadier, better-margin work - the pattern Northrop's mature programs have historically followed. We priced in that this isn't uniform: the backlog for the Aeronautics segment that houses the B-21 actually fell 9% in 2025 even as the company's total backlog grew, so we kept early growth modest rather than extrapolating the strongest segments. Continued, disciplined share buybacks add a bit more. On this path we estimate the shares are worth around $503. Bull case: the B-21 and Sentinel programs complete their fixed-price development pain without further charges and settle into full-rate production at margins closer to Northrop's other mature programs, while international demand - already growing (European sales were up 16% in 2024 and 19% in 2025, on the back of NATO members' publicly committed defense-spending increases) - continues at a similar pace for several more years. That combination supports high-single-digit to low-double-digit growth for a good part of the next decade. We estimate the shares would be worth around $782 in this case. Beyond the ten-year window, we did not assume open-ended growth. Sentinel and B-21 are multi-decade, sole-source national programs (their predecessors, the Minuteman missile and B-2 bomber, ran for decades), and the government's backlog commitments already extend well past this forecast horizon - that's a real, structural reason for cash flow to persist rather than a hopeful guess. We faded growth to roughly 2% a year in the base case beyond year ten, to flat in the bear case, and to about 3% in the bull case, in each case tied to that same backlog persistence rather than a fresh assumption. Putting it together, the margin-of-safety price is around $260 - a discount of roughly half to our base-case estimate. That is a wider margin of safety than a typical stable, predictable business would warrant, reflecting the real, disclosed execution risk on two major programs and the company's debt load, but a narrower one than a speculative or deeply cyclical business would warrant, given the long-duration, government-backed revenue base and $95.7 billion backlog behind it. No specific business event is required for this margin-of-safety price to apply. What would make this estimate wrong: a third major loss provision on B-21, an unfavorable pricing outcome when Sentinel's next contract phase is negotiated, or a sustained defense-budget slowdown would all point toward the bear case. Sustained backlog growth across all four segments (not just three of four, as in 2025) and continued international momentum would point toward the bull case.