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Europe is in the middle of the largest peacetime rearmament programme in its post-war history. At the 2025 NATO summit in The Hague, all 32 alliance members committed to spending 5 percent of GDP on defence and security-related investment by 2035, more than doubling the previous benchmark. For the first time since the 2 percent target was codified in 2014, every single NATO member met or exceeded that threshold in 2025. European allies and Canada collectively invested over 574 billion US dollars in defence in 2025, a real-terms increase of roughly 20 percent versus the prior year. Germany, long the sleeping giant of European defence spending, amended its constitutional debt brake to unlock defence budgets projected to reach 117.2 billion euros in 2026 and 162 billion euros by 2029.
Behind those political headlines sit the companies that will actually build the tanks, radars, gearboxes, ammunition and sensors that Europe needs. Three German-listed names sit at the very centre of this cycle: Rheinmetall AG, RENK Group AG and Hensoldt AG. Between them they cover armoured vehicles, artillery, air defence, naval platforms, transmission systems, radar, optronics and electronic warfare.
This deep-dive for seat11a is not a stock recommendation and not a valuation study. It is a business-model explainer. The goal is to help readers understand what these companies actually do, how they earn money, what customers they serve, where they sit in the defence value chain, and what the structural drivers of their business are. Once you understand the business, the numbers and news flow around it become far easier to interpret.
Before dissecting the three companies, it is essential to understand the demand backdrop. In a policy-driven industry like defence, the political and regulatory framework shapes revenue for a decade at a time. The current cycle is not a cyclical uptick. It is a structural reset that will define budgets, order books and industrial capacity across Europe for years.
The June 2025 NATO summit in The Hague produced the most consequential shift in alliance defence policy since the end of the Cold War. Allies agreed to raise defence investment to 5 percent of GDP by 2035, split into two components. The first is 3.5 percent of GDP for core defence requirements, aligned with NATO’s official definition of defence expenditure. The second is up to 1.5 percent of GDP for broader defence and security-related investments, including protection of critical infrastructure, network defence, civil preparedness, resilience, innovation and the strengthening of the defence industrial base.
National roadmaps describing how each ally will meet the target had to be submitted by mid-2026, meaning the political process of budget legislation is already in motion. A collective review of progress is scheduled for 2029. Even allowing for one or two dissenters — Spain has publicly indicated it will cap defence spending at around 2.1 percent — the aggregate spending trajectory represents hundreds of billions of euros in additional annual defence outlays across the alliance.
The most consequential single decision for German defence companies was the amendment of the German constitutional debt brake, or Schuldenbremse. The debt brake had historically limited structural budget deficits to 0.35 percent of GDP, constraining how much Germany could spend on defence without raising taxes or cutting other outlays. In 2025, the Bundestag amended the Basic Law to create a carve-out for defence and security investment, a change that required a two-thirds parliamentary supermajority. That amendment removed the fiscal ceiling that had shaped German defence procurement for a generation.
The numerical impact is striking. Germany’s defence budget rose 23 percent in real terms in 2024 and another 18 percent in 2025, reaching approximately 95 billion euros. It is projected to reach 117.2 billion euros in 2026 and 162 billion euros by 2029, equivalent to roughly 3.2 percent of GDP on the core definition, or approximately 3.5 percent when broader defence-related items are included. Germany’s defence budget will more than triple between 2021 and 2029 in nominal terms. For companies whose largest single customer is the Bundeswehr — Rheinmetall, RENK and Hensoldt all fit this profile — the demand tailwind is unprecedented.
It is tempting to frame the current defence cycle purely through the lens of the war in Ukraine. That reading is too narrow. Several structural forces are reshaping European defence procurement regardless of the trajectory of any single conflict.
These structural forces argue that even if any single conflict subsides, the defence spending trajectory in Europe will not simply revert to pre-2022 levels. The political consensus on the necessity of a credible European defence capability, and the industrial infrastructure being built to deliver it, have hardened to a degree that makes reversal costly.
Rheinmetall AG, listed under the ISIN DE0007030009 and traded on the Frankfurt Stock Exchange, is headquartered in Düsseldorf and traces its origins back to 1889, when it was founded as a producer of ammunition. Over more than a century it evolved through multiple corporate transformations to become one of Europe’s leading integrated defence contractors. For much of the post-Cold War period, Rheinmetall operated a dual-track model with a large civil automotive business alongside its defence operations, an arrangement that reflected the challenges of relying on European defence orders during an era of shrinking military budgets.
That balance has now decisively shifted. Rheinmetall is in the process of divesting its automotive business to concentrate exclusively on defence operations, a strategic pivot that positions the company as a defence pure-play. The company’s transformation from a mid-cap industrial with defence exposure into a DAX-listed defence champion is one of the most striking corporate refocusings in recent European industrial history.
Rheinmetall operates as a systems provider across the full defence value chain. Its revenue model rests on four building blocks:
The economics improve when Rheinmetall can bundle these building blocks together. Selling a tank platform brings with it decades of ammunition sales, upgrades, spare parts and training contracts. That lifecycle attach is one of the reasons defence primes tend to enjoy durable customer relationships and predictable long-term revenue.
Rheinmetall reports across five operating segments:
The NVL acquisition is strategically significant because it establishes Rheinmetall as a German full-service provider covering every branch of the armed forces. The naval segment now covers the entire spectrum from unmanned naval vehicles to corvettes and frigates.
The German Bundeswehr is Rheinmetall’s anchor customer, but the company sells across the NATO alliance and to selected partner countries. Ukraine has emerged as an important direct customer as European nations both donate and jointly procure equipment for Ukrainian forces. Additional customers include armed forces across the European Union, the United Kingdom, other NATO members, and select allied nations outside Europe.
Rheinmetall’s customer relationships are typically long-standing and structured around framework agreements, capability packages and lifecycle service contracts. Governments do not switch tank suppliers casually. Once a national military is equipped with a particular platform family, the follow-on demand for spare parts, ammunition, mid-life upgrades and training tends to flow to the same supplier for decades. This customer stickiness is a defining feature of the business model.
Rheinmetall sits at the prime-contractor level of the defence value chain for many programmes, meaning it takes overall responsibility for delivering a complete platform or capability to the customer. It integrates components from many sub-suppliers into a finished product. For other programmes, Rheinmetall acts as a tier-one supplier, providing sub-systems or components into a larger platform led by another prime.
The prime-contractor role carries higher margins and stronger customer relationships but also higher execution risk. The tier-one supplier role provides steadier volume across multiple programmes. Rheinmetall’s ability to play both roles across different segments gives it flexibility in how it participates in each procurement.
The drivers that will shape Rheinmetall’s business over the coming years include:
The scale of recent business activity at Rheinmetall reflects the pace of the underlying cycle:
A defence business is only as good as its ability to deliver. Rheinmetall operates production sites across Germany, and has been aggressively expanding its manufacturing footprint through both new-build facilities and international joint ventures. Investments in artillery ammunition capacity, including new plants and expansions of existing sites, are among the most significant industrial commitments made by any European defence company in decades. The company has also expanded production capabilities through partnerships in Ukraine, Hungary, Romania and other allied nations, positioning itself close to its customers and reducing single-site risk.
Production capacity has become a competitive advantage in its own right. In a supply-constrained market where governments want deliveries as fast as possible, the supplier who can actually produce at scale captures a disproportionate share of orders. This is a structural shift from the pre-2022 environment, when defence primes competed primarily on price and technology, and it plays directly to Rheinmetall’s willingness to invest ahead of the demand curve.
Rheinmetall’s strategic direction is clear. The company is exiting the automotive business, focusing exclusively on defence, expanding across all three service domains, investing in ammunition and vehicle production capacity, and building out digital and naval capabilities. The result is a more integrated, more focused and more scalable defence business than existed at the beginning of the decade.
RENK Group AG, listed under the ticker R3NK on the Frankfurt Stock Exchange, is headquartered in Augsburg, Bavaria, and is one of the most technically specialised names in the European defence industrial base. The company traces its lineage to a nineteenth-century engineering tradition and today is best known as a manufacturer of transmission systems for tracked military vehicles, most famously for the Leopard 2 main battle tank. Its return to public listing gave equity investors renewed access to a highly specialised platform that had spent years within private-equity ownership.
RENK is smaller than Rheinmetall by revenue and headcount, but its role in the European defence ecosystem is disproportionately important. The company sits at a critical chokepoint in the supply chain for armoured vehicles, marine propulsion and industrial gear systems. Without RENK transmissions, several key European tank programmes could not be built at scale.
RENK’s business model is built around highly engineered mechanical systems that convert engine power into controlled motion, whether that means driving a 60-tonne main battle tank across rough terrain or turning the propeller of a naval vessel. The revenue model has three main components:
The technical intensity of RENK’s products creates a business model with very high switching costs. Once a transmission is qualified into a specific tank or naval platform, replacing it mid-programme is almost impossible. That embedded position is one of the defining features of the RENK business.
RENK operates across three segments:
The Vehicle Mobility Solutions segment is where the defence narrative concentrates. Leopard 2 tank transmissions, gearboxes for infantry fighting vehicles such as the Puma and Boxer, and future platforms including next-generation main battle tank programmes all pass through RENK’s Augsburg and Rheine facilities. The Marine and Industry segment adds exposure to naval propulsion, benefitting from the European frigate and corvette construction cycle. Slide Bearings provides steady industrial revenue.
RENK’s customers are primarily platform primes and government defence ministries. Tank platform builders such as Krauss-Maffei Wegmann and Rheinmetall integrate RENK transmissions into complete vehicles that are then sold to national militaries. In naval propulsion, RENK works with shipbuilders and directly with navies. The company’s US subsidiary has expanded its footprint with American military customers, most notably through a large contract from the US Department of the Army.
End-market demand for RENK’s products is being driven by:
RENK is a tier-one supplier, meaning it supplies major sub-systems to prime contractors rather than delivering complete platforms to end customers. In the defence value chain, tier-one suppliers occupy an interesting position. They are less visible than primes to end customers, but they often enjoy stronger switching-cost economics because their products are deeply engineered into a specific platform and cannot be easily substituted.
Approximately 90 percent of RENK’s 2026 revenue is already covered by firm orders, illustrating how well-embedded the company is in the platform programmes of its customers. That contracted-revenue coverage is the practical outcome of long-cycle qualification and design-in economics.
The drivers of RENK’s business include:
Recent business activity underscores the scale of the cycle in RENK’s core markets:
One of the most attractive features of the RENK business model is the aftermarket. Tanks and armoured vehicles have service lives measured in decades. A Leopard 2 that entered service in the late 1970s may still be operational today after multiple mid-life upgrades. Throughout that operational life, the transmission requires spare parts, servicing, overhaul and eventual replacement. RENK captures a share of this lifecycle spend because it is the qualified supplier of record.
The economics of the aftermarket are also structurally favourable. Aftermarket revenue tends to carry higher margins than original equipment because spare parts and services are less price-sensitive when a fleet is already deployed. The aftermarket also provides a countercyclical buffer, meaning that when new-vehicle procurement slows, service revenue often accelerates as customers extend the life of existing fleets. This dual character — original equipment during procurement cycles, aftermarket across the entire operational life — makes tier-one component suppliers such as RENK particularly resilient over long time horizons.
RENK’s production footprint is anchored by its two German facilities in Augsburg and Rheine, supplemented by international operations including the US subsidiary that has expanded its role through recent US Army contract wins. Capacity investments at both Augsburg and Rheine are designed to support the delivery ramp implied by the current backlog. The rollout of the RENK production system across acquired entities is aimed at improving margin and consistency across the group. Like Rheinmetall, RENK is investing ahead of the demand curve, treating capacity as a strategic asset rather than a residual cost.
RENK’s strategic direction focuses on deepening its position in armoured vehicle transmissions, expanding its US presence, participating in next-generation platform development, and building out marine propulsion capacity. Investments in the Augsburg and Rheine facilities are designed to support the delivery ramp implied by the current backlog.
Hensoldt AG, listed under the ISIN DE000HAG0005 on the Frankfurt Stock Exchange and headquartered in Taufkirchen near Munich, is a specialist in sensor solutions for defence and security applications. The company was carved out of Airbus in 2017 through a private-equity sale and re-listed on the public markets in 2020, at which point the German federal government took a strategic stake in recognition of the company’s role in national security-critical technologies.
Hensoldt’s product portfolio spans radar systems, optronics, electronic warfare and situational awareness solutions for the air, land, sea, cyber and space domains. Its systems appear on fighter aircraft, naval vessels, ground-based air defence platforms, border surveillance systems and armoured vehicles. The company has a heritage rooted in decades of German electronics engineering, with historic ties to firms such as Zeiss and the classical German defence electronics tradition.
Hensoldt’s business model is built around highly complex electronic and electro-optical systems that allow military platforms to see, detect, classify and respond to threats. The revenue model is anchored in four pillars:
An increasingly important dimension of the Hensoldt business is software-defined defence, in which value is created not just by the hardware but by the algorithms, data fusion and artificial intelligence layered on top of it. This shifts the business mix towards higher-margin software content over time and creates opportunities for recurring revenue.
Hensoldt reports across two primary segments:
The March 2026 agreement to acquire Dutch optronics specialist Nedinsco, based in Venlo and Eindhoven with approximately 140 employees, strengthens the Optronics segment by adding electro-optical sensor systems including periscopes and driver vision systems for armoured vehicles. The deal reinforces critical supply chains and expands Hensoldt’s technological capabilities in a strategically relevant category.
Hensoldt’s customers include the German Bundeswehr, other European armed forces, and export customers across allied nations. Its sensors appear on flagship platforms such as the Eurofighter, on naval vessels operated by multiple European navies, and on armoured vehicles including the Puma infantry fighting vehicle and the Schakal light combat vehicle. The company also supplies border surveillance solutions and space-related sensing technologies.
Because sensor content is present on almost every modern military platform, Hensoldt’s addressable market grows more or less mechanically with overall defence spending. As radars, electronic warfare suites and optronics become more sophisticated, the share of total platform cost accounted for by sensors is also growing over time, giving Hensoldt an additional structural tailwind on top of the sector-wide demand growth.
Hensoldt sits primarily at the tier-one supplier level, providing complete sensor systems into platforms built by aerospace, land and naval primes. In some programmes it acts as a prime contractor for sensor-focused packages, particularly in ground-based air defence and border surveillance. The company is also increasingly positioned as a system integrator, combining multiple sensor types with data fusion and software to deliver complete situational awareness capabilities rather than isolated hardware.
The strategic sovereignty status of Hensoldt, reflected in the German government’s stake, positions it as a preferred European alternative to non-European sensor primes on nationally sensitive programmes. This political dimension shapes the customer relationship in ways that pure commercial suppliers cannot easily replicate.
Hensoldt’s business is driven by several converging themes:
Recent operational milestones illustrate the pace of the underlying business:
A defining feature of Hensoldt’s business model is the growing weight of software and data content within its products. A modern active electronically scanned array radar is not just a piece of hardware. It is a complex signal-processing platform whose performance is defined by algorithms that classify targets, reject clutter, discriminate friend from foe and fuse data with other sensors. Similarly, an electronic warfare suite depends on constantly updated threat libraries and adaptive algorithms to identify and counter new emitters.
This software content changes the economics of the business in three ways. First, it creates opportunities for recurring revenue through software updates, threat library subscriptions and sustainment contracts. Second, it raises the switching cost for customers, because the software integration effort is substantial. Third, it improves gross margins because software content typically carries higher margins than hardware. All three effects reinforce the durability of Hensoldt’s customer relationships and the quality of its future revenue base.
Hensoldt’s manufacturing footprint centres on its German operations near Munich, with additional facilities across Germany and, following the Nedinsco acquisition, the Netherlands. Investments in production capacity have been rising to support the record order backlog. Sensor manufacturing is highly specialised, involving clean-room processes, calibrated test equipment and long qualification cycles, which means capacity expansion is slower and more capital-intensive than in a general industrial category. This intensity of capital investment is one of the reasons that new entrants to the sensor market are rare.
Hensoldt is positioning itself as the European sensor and electronic warfare champion. Strategic priorities include scaling production to convert the record backlog into delivered revenue, securing critical supply chains through acquisitions such as Nedinsco, investing in software-defined defence capabilities, and expanding into adjacent areas such as space-based sensing and cyber. The company’s 2030 revenue target of 6 billion euros signals the ambition to more than double the business over the second half of the decade.
Although Rheinmetall, RENK and Hensoldt all benefit from the same European rearmament tailwind, their business models are structurally different. Understanding those differences helps place each company in the broader defence ecosystem.
Rheinmetall covers the widest span of the defence value chain, from ammunition to platforms to digital systems, and operates as a prime contractor on many programmes. RENK is a highly specialised tier-one supplier concentrated in transmissions and gear systems. Hensoldt is a defence electronics specialist focused on sensors and electronic warfare, occupying a tier-one to system-integrator position.
Rheinmetall’s revenue model balances big-ticket platform sales, high-volume ammunition, sub-system supply and lifecycle services. RENK’s revenue model is anchored by original equipment transmission sales into platforms, supported by long-cycle aftermarket revenue from a large installed base. Hensoldt’s revenue model combines original equipment sensor sales, upgrade and retrofit programmes, development contracts and increasingly software-defined defence content.
All three companies count the German Bundeswehr as a critical customer, but their programme exposures differ. Rheinmetall has the widest programme footprint, spanning multiple platforms and product families. RENK has concentrated exposure to a narrow set of platform programmes but with very high content per platform. Hensoldt is diversified across many platforms but concentrated in the sensor category, where its share of programme value can be significant.
To fully understand any defence company’s business model, it helps to understand how the underlying contracts are structured. Government defence procurement operates very differently from most commercial industries, and the mechanics have a direct impact on revenue timing, margin profile and risk allocation.
Many major defence programmes are structured as framework agreements between a government customer and a supplier. A framework agreement establishes the terms, pricing, technical specifications and delivery framework for a class of products over an extended period. Under that umbrella, the government issues individual call-off orders that trigger specific production batches. This structure gives the supplier a strong indication of expected future volume, while giving the customer flexibility to adjust order sizes as needs evolve. Rheinmetall’s ammunition business, RENK’s transmission programmes and Hensoldt’s radar upgrades all commonly operate under this model.
Large defence contracts often recognise revenue against the achievement of technical milestones rather than at final delivery. This means revenue can flow into the income statement well before the physical product is delivered, provided the supplier has met defined engineering or production checkpoints. Milestone-based accounting improves cash flow visibility but also introduces complexity, because a delayed milestone can push revenue into the following quarter or year.
Defence customers routinely provide advance payments to suppliers, particularly for large programmes with long production cycles. These payments finance work-in-progress inventory, tooling and supply chain commitments. Advance payments improve supplier cash flow and reduce the working capital burden of scaling production. Hensoldt’s raised 2026 free cash flow guidance, supported by higher customer advance payments, is a specific example of how this mechanic works in practice.
Modern defence procurement increasingly bundles the original equipment purchase with lifecycle support, including maintenance, training, spare parts and mid-life upgrades. This service attach transforms a one-time capital sale into a decade-long revenue stream, dramatically improving the quality of earnings and the durability of customer relationships. All three companies benefit from this structural shift towards lifecycle contracting.
Defence programmes can be cancelled, restructured or delayed by political and budgetary decisions. The collapse of the Franco-German FCAS next-generation fighter programme is a recent example of how a major multi-year revenue opportunity can evaporate. Successful defence companies manage this risk by diversifying across programmes, customers and geographies, and by structuring contracts to protect against unilateral cancellation.
Beyond the demand-side tailwind, several themes are reshaping how European defence companies operate. Understanding these themes helps explain the strategic direction chosen by Rheinmetall, RENK and Hensoldt.
Twenty years of counter-insurgency operations trained European militaries to think of defence as a services-intensive business. The war in Ukraine has reversed that emphasis. Ammunition consumption at industrial-war intensity has revealed that European production capacity for artillery shells, propellants and precision munitions was far too small. Rheinmetall’s investments in ammunition capacity, and its ability to scale that capacity faster than competitors, are a direct response to this shift.
Modern defence procurement increasingly favours suppliers who can integrate multiple capabilities into a coherent system rather than delivering isolated components. Hensoldt’s move from sensor supplier to system integrator, and Rheinmetall’s move from platform builder to full-service defence prime, both reflect this trend.
The value of defence hardware is increasingly determined by the software that runs on it. Radar sensitivity, electronic warfare effectiveness, drone detection, target discrimination and networked command all depend on algorithms and data fusion. Companies that build strong software capabilities alongside their hardware businesses will capture a growing share of programme value. Hensoldt has been the most explicit about this shift, but Rheinmetall’s Digital Systems segment is a parallel expression of the same trend.
European Union instruments and national procurement policies are increasingly favouring domestic and European suppliers over non-European alternatives. This creates an implicit preference for companies such as Rheinmetall, RENK and Hensoldt when European militaries choose between competing options. Supply chain resilience acquisitions, such as Hensoldt’s Nedinsco deal, are a direct response to the sovereignty theme.
Unmanned aerial systems, unmanned ground vehicles and autonomous surface vessels are becoming central to modern combat. All three companies have exposure to this trend. Rheinmetall’s air defence and digital systems businesses address counter-drone requirements. RENK is developing heavy-class unmanned ground vehicle concepts and autonomous surface vessel technology. Hensoldt’s sensors and electronic warfare products are essential to detecting and countering hostile uncrewed systems.
In a demand-constrained environment, capacity is a strategic differentiator. All three companies are investing heavily in production capacity, whether in ammunition plants, transmission facilities or sensor manufacturing sites. The ability to actually deliver at scale, on time, has become one of the most important competitive dimensions of the modern defence business.
Rheinmetall, RENK and Hensoldt are three of the clearest listed illustrations of Europe’s defence transformation. Rheinmetall shows what happens when a diversified industrial refocuses entirely on defence and builds a full-service platform across land, air and sea. RENK shows how a specialised tier-one supplier translates deep engineering into decades of embedded revenue. Hensoldt shows how a defence electronics champion positions itself for the shift towards sensor-heavy, software-defined defence.
The common thread across all three is that their business models are anchored in long-cycle customer relationships, high switching costs and product portfolios that align with the specific capability categories where European militaries are investing most heavily. Ammunition. Armoured vehicles. Air defence. Naval platforms. Radar. Electronic warfare. Optronics. Each of these categories is being expanded across the alliance, and each of these companies has a distinct role to play in delivering it.
For seat11a readers who follow European listed companies with a business-model lens, the key takeaways from this deep-dive are:
The European defence sector is not a short-term story. It is a decade-long capability-building programme playing out across a continent that has decided, after years of hesitation, to take its own security seriously. Rheinmetall, RENK and Hensoldt are three of the clearest examples of the industrial infrastructure being built to deliver it. At seat11a we will continue to track these three names, watching order intake, backlog dynamics, capacity ramp and strategic milestones as the cycle plays out through the second half of 2026 and into 2027.
(c) seat11a – Publicly Listed Companies: Elevator Pitch, Deep-Dive, Financial Results, and ESG
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