Rheinmetall's Constitutional Court Challenge Casts Shadow Over Naval Expansion

Rheinmetall shares plunge amid constitutional challenge to procurement law that could delay orders; naval expansion and €73B backlog offer offset, but Fidelity trims stake.

Rheinmetall's stock has tumbled 38% from its all-time high of €1,995 set last September, and a fresh legal threat to Germany's defence procurement framework could make the recovery even steeper. The Düsseldorf Higher Regional Court has suspended proceedings in a procurement dispute and referred a key provision of the Bundeswehr Procurement Acceleration Act to the Federal Constitutional Court, questioning its constitutionality.

At the heart of the matter is §16(1) of the law, which came into force in February. The provision strips unsuccessful bidders of the automatic suspensive effect of their appeals — effectively removing the procurement halt that typically freezes award decisions during challenges. The court contends this violates the constitutional guarantee of effective legal protection. If the Constitutional Court strikes down the rule, rival contractors would regain powerful legal levers to delay large-scale awards, injecting fresh uncertainty into the multi-billion-euro orders on which Rheinmetall depends. Germany remains the group's single most important market.

Yet while that legal question hangs in the balance, the group is quietly assembling a maritime empire that could reshape its revenue mix. In the first quarter of 2026, Rheinmetall launched a standalone Naval Systems division following the integration of the NVL shipyard group, which includes four northern German yards — among them Blohm+Voss in Hamburg and the Peene-Werft in Wolgast. The new unit started with a project volume of roughly €5.5 billion, drawn from the German fleet service boat programme and a Bulgarian patrol boat project. Chief executive Armin Papperger has set a target of around €5 billion in naval revenue by 2030. Due diligence is already under way for a potential takeover of German Naval Yards Kiel, and Rheinmetall has assumed project leadership of the F126 frigate programme — an estimated €12 billion undertaking.

That expansion rests on an already formidably deep order book. At the end of the first quarter, the backlog stood at approximately €73 billion. Management aims to swell that figure to as much as €135 billion by year-end — a number that puts the current share-price slide in a different perspective. The board has reaffirmed its full-year operating margin guidance of around 19%, with a significant acceleration in deliveries expected in the second half.

Investor sentiment, however, remains cautious. US asset manager FMR LLC, better known as Fidelity, trimmed its voting-rights stake on 18 May from 3.09% to 2.88%, dropping below the 3% reporting threshold. The move adds to the bearish overhang that has weighed on the stock.

At Tuesday's close, the shares sat at €1,237.80, having lost 23% since the start of the year. The 52-week low of €1,118, set on 13 May, lies just 11% beneath the current level. Despite the protracted decline, the relative strength index has jumped to 90 — an extreme overbought reading triggered by the 10% bounce off that May trough — while the annualised 30-day volatility runs at 49%, indicating no shortage of intra-day swings.

The outcome of the constitutional referral remains open, and the timeline uncertain. Until clarity emerges, the procurement acceleration law — and the smooth flow of future defence contracts — cannot be taken for granted. For Rheinmetall, the immediate challenge is to convince the market that its maritime growth story can deliver fast enough to offset the legal headwinds and the lingering shadow of a stock that has lost more than a third of its value in eight months.