Defence Prime Segment Margin Benchmarks

Margins Vary More Inside One Prime Than Between Primes

Five of the six defence primes we track (the contractors that hold the main government programmes) reported FY2025 company-level margins between 9.0% and 11.8%. Inside each company, the spread is two or three times wider. Lockheed Martin ran from 6.9% in Aeronautics to 13.8% in Missiles & Fire Control, Northrop Grumman from 6.3% to 14.6% and BAE Systems from 6.7% to 15.4%.

What a segment builds sets its margin far more than which prime owns it. This guide ranks all 24 reporting segments across the six filers on FY2025 figures, with each filer’s own margin basis beside the number.

FY2025 Segment Operating Margins, Ranked

Every figure is segment operating profit divided by sales from each company’s FY2025 results, on the basis shown in the right-hand column (ROS is RTX’s return on sales). L3Harris states both a GAAP and an adjusted figure; the table uses GAAP to keep adjustments out.

The table sorts largely by what gets built. The four lowest segments make military aircraft and ships, and at Lockheed Martin, Northrop Grumman, General Dynamics and BAE Systems that segment is the company’s lowest. The top six are mostly electronics, communications and missiles. BAE’s Air sector, at 11.9%, is the aircraft business that breaks the pattern.

Company Totals Sit in a Narrow Band

L3Harris is the only one outside the 9.0-11.8% range, and its figure is the only adjusted one. On its GAAP operating margin of 9.7%, it sits with the others. General Dynamics is the reverse case: its 10.2% is consolidated, so it already carries corporate costs that the segment-level totals of the other US filers leave out.

Four Bases Sit Under One Column

The ranking mixes four definitions:

• Segment operating margin (Lockheed Martin, Northrop Grumman, General Dynamics): segment operating profit ÷ segment sales, before corporate costs.
• Return on sales (RTX): the same ratio under RTX’s own label.
• GAAP and adjusted (L3Harris): the adjusted figure removes items L3Harris lists in its non-GAAP reconciliation. For Communication Systems the two are identical. For Aerojet Rocketdyne, GAAP is 9.5% and adjusted is 12.5%, which is enough to move it from 16th to 8th.
• Underlying EBIT ÷ sales (BAE Systems): BAE’s own measure, which sits outside IFRS.

The US primes charge their segments the pension cost that government contracts allow, under Cost Accounting Standards (CAS). Their consolidated results use the US GAAP pension cost instead, and the gap between the two sits on a reconciling line between segment and consolidated profit. BAE reports under IFRS and has no such line. The FAS vs CAS guide walks through how large that line can get.

A margin is a ratio, so BAE’s sterling figures rank against the dollar filers without an FX rate.

Reading a Segment Against a Band

We read segment margins against two bands, our own unsourced working convention, set from this peer set’s spread:

Nineteen of the 24 segments land in a band. Three fall in the one-point gap between them: BAE Air (11.9%), RTX’s Raytheon (11.5%) and BAE Platforms & Services (11.4%). Two sit above the systems band. L3Harris Communication Systems, at 25.2%, is almost nine points clear of anything else in the peer set. RTX’s Collins Aerospace, at 16.3%, sits just above it, inside a company that earns 48% of its revenue from commercial customers.

One segment fits its band but not the table. General Dynamics Aerospace, at 13.3%, is mainly Gulfstream business jets and Jet Aviation, a commercial business at 25% of GD’s revenue, so its place in a defence ranking needs a footnote.

A band places a margin against the peer spread; it does not name the work. Space and cyber segments also land in the platform band. Nor does a band say whether a margin is high or low for that work, or which way it is heading. Contract type matters too: a fixed-price production lot and a cost-plus development contract on the same platform can earn very different margins. The cost-plus vs fixed-price guide covers that trade-off.

Where a Naive Ranking Goes Wrong

One error is putting L3Harris’s 15.8% beside the other primes’ figures and reading it as the highest-margin prime. Its company figure is adjusted. On the GAAP basis it sits at 9.7%, inside the same range as the rest.

Another is reading one segment’s margin as the company’s. Lockheed Martin’s Aeronautics segment at 6.9% is largely one programme: F-35 is 67% of Aeronautics sales and 27% of Lockheed Martin’s total. That 6.9% says a lot about F-35 and little about Missiles & Fire Control at 13.8%.

The ranking also says nothing about size: a small segment at a high margin can earn fewer dollars than a large one at a low margin.

And margin is not cash. A prime can report steady segment margins while working capital or pension timing pulls its free cash flow well away from earnings. Check FCF conversion before drawing a conclusion about either.