Three Constraints Standing Between Defence Stocks and Their Order Books

The war has produced a tidy investment thesis for defence stocks: the era of restraint is over. Europe is rearming. The United States is replenishing depleted stockpiles and preparing for a broader set of conflicts. Government budgets are rising in lockstep with geopolitical anxiety. The order books at Lockheed Martin, RTX and Northrop Grumman have swelled to eye-popping levels.

The trouble is that the market has already priced in a decades-long boom. What remains to be earned is whether these companies can execute — and whether the returns to shareholders resemble the ones investors assume they are buying into.

Three constraints complicate the picture. Physical capacity is tighter than the headlines suggest. Shareholder returns are being reshaped by a political intervention that was unthinkable a year ago. And valuations embed years of flawless execution at levels that leave little margin for disappointment.

The war in Ukraine has evolved in ways that matter directly to defence budgets. Russia continues to hammer Kyiv and surrounding regions with missiles and drones; strikes in late August 2026 killed more than 16 people across the capital and its suburbs. Ukraine has responded by escalating its own drone campaign deep into Russian territory, striking oil refineries as far east as Omsk, some 1,500 miles from the front line. These strikes have disrupted Russian refining capacity and forced Moscow to import refined fuel from India and East Asia — a reversal of a trade flow that once ran the other way.

The implications for NATO have been explicit. At the July 2026 summit in Ankara, Secretary General Mark Rutte announced that allies would invest more than $40 billion in counter-drone capabilities over the next five years. Drones, he said, have "fundamentally altered" modern warfare. European NATO core defence spending has already doubled since 2019, with McKinsey projecting it could reach approximately €800 billion by the end of the decade as allies move toward a new 3.5% of GDP spending target.

The US side of the account has been equally active. The conflict with Iran since February 2026 and repeated disruptions at the Strait of Hormuz have driven demand for missile defence and munitions replenishment. Lockheed Martin signed multi-year framework agreements with the Department of War in the first quarter of 2026 to increase production rates of Patriot, THAAD and Precision Strike Missiles by three to four times current levels. RTX's Raytheon division reported over $5 billion in new contracts for upgraded Patriot interceptors and munitions effectors destined for Ukraine, Poland and the US government.

The quarterly numbers have been impressive. Lockheed Martin reported second-quarter 2026 sales of $20.1 billion, up 11% year on year, with a book-to-bill ratio of 3.2 and a backlog of $230 billion. RTX posted quarterly sales of $24.7 billion, up 16% organically, with an adjusted earnings-per-share increase of 21%. Northrop Grumman's backlog reached a record $105 billion, up 17% from the prior year.

All three companies raised full-year guidance in the second quarter, a clear signal that management teams are confident the demand pipeline will hold. Lockheed increased its sales outlook to $79.75-$81.75 billion for the full year. RTX lifted guidance to $95-$96 billion, up from $92.5-$93.5 billion.

The order books are genuine. There is no question that governments are writing cheques at a pace unseen since the Cold War.

The first constraint is physical. A backlog of $230 billion means nothing if production lines cannot absorb it. Lockheed's Q1 2026 results showed the problem clearly: free cash flow dropped to a negative $291 million from $955 million a year earlier, driven by higher working capital needs as the company accelerated billing to meet rising demand. The Missiles and Fire Control segment grew sales 19% in the second quarter, but management flagged capacity expansion as a binding constraint. Both RTX and Northrop Grumman have made the same point in their earnings calls.

Europe's problems are more acute. Ammunition production capacity has risen from approximately 300,000 rounds per year in 2022 to an estimated 2 million by the end of 2025 — a sixfold increase that still falls far short of the requirements identified by NATO planners. The continent's defence platform fragmentation is more than four times higher than in the US, meaning that scale benefits remain elusive. Germany's cancellation of its multi-billion-euro F126 frigate programme last summer, partly due to cost overruns and production delays, sent Rheinmetall shares sharply lower and exposed the gap between political ambition and industrial reality.

The supply chain itself is the bottleneck. The defence sector relies on layers of small, family-owned component suppliers who lack the equity capacity to expand rapidly. A missing fastener can halt the delivery of a fighter jet. Lockheed's Aeronautics division saw unfavourable profit adjustments of $125 million on the F-16 programme and $55 million on the C-130 in the first quarter, both attributed to supply-chain and performance delays.

The second constraint is political, and it arrives from an angle many shareholders did not anticipate. On 7 January 2026, President Trump issued an executive order prohibiting major defence contractors from paying dividends or conducting stock buybacks if they are deemed to be underperforming on contracts or failing to invest sufficiently in production capacity. The order, titled "Prioritizing the Warfighter in Defense Contracting," directs the Secretary of War to identify underperforming contractors and enforce remediation under the Defence Production Act.

The immediate effect was significant. Combined spending on buybacks and dividends by Lockheed Martin, RTX, Northrop Grumman and General Dynamics dropped from $4.2 billion in the first quarter of 2025 to $2.7 billion in the first quarter of 2026 — a reduction of roughly 36%. This is not a marginal tweak; it is a material change to the total return profile of stocks that investors have long held precisely because of their reliable shareholder distributions.

The executive order is only the beginning. The Senate Armed Services Committee approved a provision in the National Defense Authorization Act that would codify and broaden the restriction, preventing DoD contractors from executing buybacks or paying dividends without government approval, effective June 2027. The measure has bipartisan support and faces vigorous opposition from the Chamber of Commerce and 40 other business groups, but removal via a floor amendment has been deemed unlikely.

To be sure, these companies remain profitable. The reduction in distributions has not harmed underlying fundamentals, and the companies are redirecting capital toward capacity expansion. Yet an investor who bought Lockheed for its 2.4% dividend yield and steady buyback programme last year now faces a return stream that is partially in the hands of the Pentagon. The change in character is not yet fully reflected in how most investors think about these names.

Which brings the reader to the third constraint: valuation. Lockheed Martin trades at approximately 21.5 times trailing earnings. RTX, with its diversified aerospace and defence mix, is at 37.5 times. Northrop Grumman is at roughly 17.5 times trailing earnings, though its forward multiple suggests the market expects earnings to grow sharply.

These multiples already embed a long period of strong execution. A 21.5x multiple on Lockheed implies that the market expects the $230 billion backlog to convert smoothly into revenue and margin expansion, capacity constraints to ease rather than bite, and political friction over shareholder returns to remain manageable. RTX's 37.5x multiple — the highest among the trio — requires that the Raytheon division's munitions boom sustains itself through a volatile geopolitical environment and that the commercial aviation recovery underpinning the Collins Aerospace and Pratt & Whitney segments holds steady.

The stocks are not immune to bad news. European defence shares dropped sharply on 10 April 2026 after Russia and Ukraine agreed to a temporary Orthodox Easter truce, demonstrating that investor sentiment is sensitive to diplomatic developments even when they are fleeting. And the sector has already experienced a pullback from its early-2026 highs as de-escalation hopes and buyback restrictions weighed on sentiment.

The investment case for US defence contractors rests on a proposition that is structurally sound but financially demanding. The demand is real, the backlogs are historic, and the geopolitical tailwinds are unlikely to reverse even if the Ukraine conflict reaches some form of settlement. Europe has committed to a rearmament cycle that will span well over a decade, driven by a NATO target of 3.5% of GDP by 2035. The US government is replenishing stockpiles depleted by conflicts in Ukraine and the Middle East while investing in next-generation platforms.

Yet the question for shareholders is not whether there will be orders. It is whether the money behind those orders flows back into their portfolios at a pace that justifies today's price. Three headwinds — production bottlenecks that delay revenue recognition, political restrictions that compress the shareholder return stream, and valuations that assume execution without hiccups — work in the same direction. They do not invalidate the thesis. They make it a tighter trade than the order books suggest.