Defense M&A in 2026: Primes Consolidate, Drones Reprice, Tier-2 Roll-Ups Compound

The demand curve has shifted, not cycled #

SIPRI's 2025 Military Expenditure Database puts global outlays at USD 2.71 trillion in 2024, up 9.4 percent in real terms, the largest annual increase since 1988. Europe rose 17 percent. NATO recorded 23 of 32 allies at or above 2 percent of GDP, against 11 in 2023 and 3 in 2014. Poland leads at 4.7 percent, followed by Estonia, Latvia, and Greece above 3 percent. Germany cleared 2 percent for the first time since 1992 on the back of the 100 billion euro Sondervermoegen authorized in 2022.

The flow into M&A is mechanical. Capital IQ and Mergermarket data compiled by S&P Global show announced aerospace and defense deal value of USD 78 billion in 2024 against a 2015 to 2019 average of USD 41 billion. Reuters and Bloomberg trackers put 2025 near USD 92 billion with 2026 Q1 run rate above USD 28 billion. Composition has shifted toward subsystems: munitions, propulsion, autonomy, space payloads, and cyber. Pure platform deals remain rare given antitrust friction at the prime tier, with Lockheed Martin's 2022 abandonment of Aerojet Rocketdyne under FTC pressure as the reference case.

Demand is no longer event driven. Ukraine, Gaza, Taiwan posture, and Houthi disruption to Bab el Mandeb shipping have each contributed, but the binding driver is allied posture realignment. The 2025 NATO Hague summit communique referenced a working 5 percent of GDP figure comprised of 3.5 percent core defense and 1.5 percent resilience. The planning assumption inside European defense ministries is that 3 to 3.5 percent core defense becomes the new floor for frontline allies through 2030.

Primes consolidation: BAE Ball, L3Harris Aerojet, and the antitrust ceiling #

The prime tier above USD 5 billion in revenue is functionally closed to horizontal consolidation. The five Western primes (Lockheed Martin, RTX, Northrop Grumman, General Dynamics, Boeing Defense) together accounted for USD 196 billion in 2024 defense revenue per company filings, and any combination would face FTC, DoJ Antitrust, European Commission, and CMA review. The 2022 Lockheed Aerojet abandonment, the 2024 FTC consent order on RTX's Pratt and Whitney sustainment business, and the 2025 European Commission review of the KNDS restructuring all confirm horizontal moves are blocked.

Primes have therefore concentrated on adjacent capability acquisitions where the buyer is not the dominant supplier. BAE Systems' February 2024 close of Ball Aerospace at USD 5.55 billion enterprise value, with roughly 5,200 employees and a USD 1.9 billion 2023 revenue base in space payloads, is the cleanest example. CFIUS approved without divestiture, giving BAE a US owned space business comparable to Northrop's Space Systems segment in payload depth. L3Harris's July 2023 close of Aerojet Rocketdyne at USD 4.7 billion delivered solid rocket motor capacity and hypersonic propulsion, mitigating the single source risk that had concerned DoD throughout the Lockheed bid period.

Northrop has taken a partnership rather than acquisition route in autonomy, announcing in 2024 a teaming agreement with Shield AI to integrate V BAT with Northrop platforms. The 2025 follow on integrating Hivemind onto the autonomous CCA program reflects the same logic: pay for capability through a contract, equity stake, or joint venture, not through acquisition that triggers antitrust and CFIUS friction. RTX, General Dynamics, and Lockheed have followed similar patterns through corporate venture arms.

Drones and autonomy: Anduril, Shield AI, AeroVironment, and the new mid tier #

The clearest valuation reset of the cycle has been in autonomous systems and counter UAS. Anduril closed a Series F in August 2024 at a USD 14 billion post money valuation led by Founders Fund, with USD 1 billion in 2024 revenue and a backlog including the Air Force CCA Increment 1 award (shared with General Atomics), Replicator, and the IVAS transition. Reuters and Bloomberg through Q1 2026 indicate Anduril is in the market for an additional round above USD 28 billion.

Shield AI raised a Series F at USD 5.3 billion post money in November 2024, with Hivemind and V BAT anchoring a backlog including Coast Guard and Marine Corps programs. AeroVironment's USD 4.1 billion all stock acquisition of BlueHalo, closed in May 2025, combined Switchblade loitering munitions and tactical UAS with BlueHalo's space, EW, and counter UAS portfolio to create a USD 1.7 billion revenue mid tier prime. Kratos, Skydio on the federal side, and Saronic in unmanned surface vessels have raised between USD 2 billion and USD 4 billion through 2024 and 2025.

The strategic question for primes is acquire, partner, or build. The acquisition path is foreclosed at current valuations: USD 14 billion for Anduril or USD 5 billion for Shield AI implies revenue multiples that fail prime accretion math and would attract CFIUS attention given foreign LP exposure. The partnership path, exemplified by Northrop Shield AI and Lockheed Anduril joint work on counter UAS, transfers capability without balance sheet risk. The likely 2026 to 2027 outcome is a mix: one or two listed mid tier autonomy firms (likely AeroVironment after BlueHalo digestion, or Kratos) absorbed by a prime, while Anduril and Shield AI remain independent and pursue IPO paths.

Munitions and propulsion: the structural shortage that keeps repricing #

Munitions production is the clearest case of structural undercapacity that has changed acquisition logic. Per JPEO Armaments and Ammunition reporting and the GAO 2024 industrial base review, US 155 millimeter shell output ran at 14,000 rounds per month in early 2022, reached 36,000 by mid 2024, and is targeted at 100,000 by late 2026. BAE's Holston Army Ammunition Plant, the new Mesquite Texas TNT and IMX line, and Scranton metal parts carry most of the ramp. Rheinmetall's Niederwald plant in Lower Saxony is contracted at 200,000 rounds per year by 2027 within a path to 1.1 million rounds per year across Germany, Hungary, Spain, Australia, and South Africa.

Hypersonics is the demand pull behind propulsion repricing. Conventional Prompt Strike, Long Range Hypersonic Weapon, HACM, and the European HYDIS and HYDEF consortia all require boost stage solid rocket motors and scramjet integration that did not exist at scale in 2020. Beyond Aerojet Rocketdyne, Northrop's solid rocket motor capacity at Promontory and Magna, Avio in Italy, Roxel in France and the UK, and Bayern Chemie within MBDA sit in strategic short supply. The pattern is greenfield investment plus minority stakes rather than full acquisition, given that DoD and European MoDs treat rocket motor capacity as a strategic asset that resists single buyer control.

European deal flow tracks the same logic. Rheinmetall acquired Expal from Maxam in 2023 for 1.2 billion euros. Hensoldt acquired ESG in 2024 for 730 million euros. KNDS restructured ahead of a partial listing, and MBDA continues as the European missile prime with order intake above 13 billion euros in 2024. Helsing closed a 450 million euro Series C in 2024 at a 5 billion euro post money valuation per Reuters, giving Europe an indigenous autonomy asset in the same tier as US comparables. German, French, and Italian FDI screens remain conservative on sensitive capabilities.

PE roll ups: Arlington Capital, AE Industrial, Acorn Growth, and the tier 2 to 3 thesis #

The most active capital pool in defense M&A by deal count is private equity focused on tier 2 and tier 3 component suppliers. Arlington Capital, AE Industrial, Acorn Growth, Veritas Capital, KKR's aerospace platform, Cerberus, and Bain Capital have together announced more than 80 platform and add on transactions in defense and aerospace components since the start of 2023, per PitchBook and Mergermarket. Tier 2 and tier 3 suppliers in machining, casting, ruggedized electronics, EW subassemblies, sensors, and RF components have order books extending five to seven years, price escalators indexed to PPI, and prime customers that pass through inflation via FAR cost reimbursement and ECP modifications.

AE Industrial's Firefly platform, the 2024 Adams Industries acquisition, and the Yes Aerospace rollup reflect the model. Arlington's Polaris Industrial platform, the 2024 sale of Centauri to KBR for USD 800 million, and the 2025 Exiger sale to Andesite show exit logic working through both strategic and sponsor to sponsor channels. Acorn Growth's aerospace machining and MRO deals clear at 8 to 11 times EBITDA, against historical defense midmarket multiples of 6 to 8 times. Platforms are producing 200 to 400 basis points of EBITDA margin lift over 24 to 36 month holds.

The CFIUS overlay matters. Three of the largest 2024 to 2025 European take privates of US tier 2 suppliers were restructured to remove non US LP participation above CFIUS mitigation thresholds. The 2025 amendment to FIRRMA Part 800 covering data centers, biotech, advanced manufacturing, and unmanned systems components has tightened the mandatory filing perimeter, and the 2026 Treasury rulemaking on outbound investment to China continues to pull venture capital toward US and allied targets. The net effect is to compress the buyer pool for some assets and to lift multiples for buyers with clean LP rosters and clean supply chains.

Implications by buyer: PE, public investors, primes, governments #

For private equity sponsors, the highest risk adjusted returns through 2027 are in tier 2 and tier 3 component roll ups in propulsion, EW, RF, ruggedized electronics, and additive manufacturing, with 7 to 9 year holds that match the contract visibility embedded in primes' order books. Paying 11 times EBITDA for a single source supplier with a five year backlog is defensible. Paying 14 times on the assumption of further multiple expansion is not. The structural risk is a peace dividend on a five to seven year horizon that compresses backlog and exit multiples simultaneously. The 1989 to 1996 DoD topline contraction is the reference. Disciplined sponsors should underwrite to 7 to 8 times exit and rely on EBITDA growth and deleveraging for returns.

For public market investors, the prime tier offers asymmetric exposure at moderate multiples (Lockheed, RTX, Northrop, General Dynamics trade between 16 and 22 times forward earnings on Q1 2026 prints), with tail risk of margin compression on the next major cost plus to fixed price recompete cycle. The European listed group (BAE Systems, Rheinmetall, Saab, Thales, Leonardo, Hensoldt) continues to outperform US primes on revenue growth and margin, with Rheinmetall up roughly 5 times and Hensoldt up roughly 3 times since end 2021. The trade through 2027 is to maintain European exposure while watching for ratification of the 5 percent NATO target.

For primes, the strategic priority is to build or partner into autonomy and counter UAS, secure long lead propulsion and rocket motor capacity through JVs or minority stakes, and manage CFIUS exposure on cross border bolt ons. For governments in NATO Europe and the Indo Pacific allies, the policy priority is to pull forward munitions and propulsion capacity through long term contracts rather than spot procurement, harmonize FDI screening so allied capital can move into allied targets without 18 month review windows, and protect autonomy and space IP through coordinated export control rather than blanket restriction. The window to convert the post 2022 demand shock into resilient industrial capacity is the next 24 to 36 months. After that, marginal capital looks at AI compute and energy transition capacity, where the return profile is cleaner.

Sources #

• SIPRI Military Expenditure Database 2025 release
• Defence Expenditure of NATO Countries 2014 to 2024
• DoD FY 2025 Budget Request and FY 2026 Budget Submission
• BAE Systems completes acquisition of Ball Aerospace
• L3Harris closes Aerojet Rocketdyne acquisition
• AeroVironment to acquire BlueHalo in all stock transaction valued at USD 4.1 billion
• Anduril Series F at USD 14 billion valuation, defense tech funding tracker
• Shield AI Series F at USD 5.3 billion post money valuation
• Aerospace and Defense M&A 2025 mid year report
• Munitions Industrial Base: DoD Has Increased Production Capacity but Faces Challenges
• Rheinmetall opens Niederwald 155 mm artillery plant
• Hensoldt to acquire ESG Elektroniksystem und Logistik
• CFIUS Annual Report to Congress and 2025 FIRRMA Part 800 amendments
• European Defence Industry Programme proposal and EDF allocations
• Coverage of Anduril, Shield AI, AeroVironment BlueHalo, and primes M&A
• The Military Balance 2025 chapter on emerging capability and hypersonics
• Defense industrial base coverage and PE platform tracking