The Shipbuilding and Naval Buildout

Two companies build every major U.S. Navy combatant: Huntington Ingalls Industries (HII) and General Dynamics (GD). HII is the sole builder of nuclear-powered aircraft carriers (Nimitz and Gerald R. Ford classes) and one of two builders of Virginia-class submarines, operating out of Newport News, Virginia. General Dynamics' Bath Iron Works (Maine) builds Arleigh Burke-class destroyers, while its Electric Boat division (Groton, Connecticut and Quonset Point, Rhode Island) is the other half of the submarine duopoly with HII. These are not competitive bids in the traditional sense — the Navy awards blocks of ships to both yards to maintain the industrial base, so both primes benefit when submarine or destroyer rates increase.

When the Navy's 30-Year Shipbuilding Plan calls for accelerating the Virginia-class buy from 1.2 to 2 submarines per year — a recurring political goal — both HII and GD receive additional contracts. When the carrier program adds a ship or accelerates refueling overhaul schedules, HII is the only recipient. Tracking the Navy's annual budget request (released each February with the President's budget) and the NDAA markup (typically passed by December) tells you whether multi-year procurement authority is being extended or expanded. Both are publicly available documents.

For investors, the key metric to watch is backlog. HII and GD both report shipbuilding-segment backlog in their quarterly earnings. A growing backlog with funded contracts (as opposed to unfunded options) is the clearest leading indicator of revenue visibility. Neither company is cheap on a trailing basis, but naval primes historically trade at a premium to the broader defense sector precisely because of this backlog durability.

A warship is roughly 60 percent combat systems and electronics by program cost. The hull is the container; the sensors, weapons, and communications gear are what the Navy is actually buying. This layer is where Raytheon Technologies (RTX) — now rebranded under the RTX ticker — and L3Harris Technologies (LHX) dominate. RTX supplies the SPY-6 radar family (the Active Electronically Scanned Array that upgrades every Arleigh Burke Flight III destroyer), the Standard Missile family (SM-2, SM-3, SM-6), and the Tomahawk cruise missile. L3Harris supplies communications systems, electronic warfare suites, and night-vision and ISR equipment that appears across the surface fleet.

Leidos Holdings (LDOS) is less visible but increasingly important: it holds the Navy's NGEN contract (the IT backbone of all shore and shipboard Navy networks) and wins a disproportionate share of undersea surveillance and sonar work. Northrop Grumman (NOC) supplies the AN/TYQ-23 combat-management systems and is the lead integrator on the Columbia-class ballistic-missile submarine program's strategic-deterrent electronics — a program so politically protected it is effectively immune to budget pressure.

The combat-systems tier benefits differently from the primes: contracts tend to be shorter in duration but higher in margin, and they replenish more frequently because munitions and electronics are consumed in peacetime training and real operations (as has been visible in munitions drawdown replenishment following Red Sea operations). When the Navy is operationally stressed, the electronics and missiles tier often receives supplemental appropriations faster than the shipbuilders, because new hulls take years to build but restocking a missile magazine can be funded in months.

Every nuclear-powered Navy vessel — carriers, submarines, and in future potentially surface combatants — runs on a reactor designed around highly enriched uranium supplied through a tightly controlled domestic supply chain. BWX Technologies (BWXT) is the single-source supplier of naval nuclear reactor components and fuel for the U.S. Navy. There is no commercial substitute and no foreign alternative. When the submarine buy-rate accelerates, BWXT is a direct and essentially captive beneficiary. The company also supplies reactor components for the UK's Astute-class submarines under the AUKUS agreement, which adds a second sovereign customer to its order book.

For propulsion on conventional (non-nuclear) vessels — including the large fleet of amphibious ships, logistics vessels, and future frigate programs — Rolls-Royce Holdings (RYCEY) supplies gas turbine engines under the MT30 program for certain platforms, though the ticker trades as an ADR and investors should note its UK domicile. For purely domestic exposure, the conventional-power supply chain runs through GD's own marine division and subcontractors that are not separately publicly traded at scale.

Tracking BWXT is particularly useful as an independent signal: its order intake is a real-time proxy for the classified and unclassified submarine program's health. The company's investor relations disclosures on reactor-component delivery schedules — even without specifics — confirm whether the build rate is tracking to plan or slipping.

Warship construction consumes specialized high-strength steel — HY-80 and HY-100 grades for submarine pressure hulls — that only a small number of domestic mills can produce. Nucor (NUE) and Steel Technologies (private) are among the domestic producers capable of meeting Navy specifications, though Nucor's naval exposure is a small fraction of its overall business. More direct is NN Inc. (NNBR) and the broader precision-castings industry, which supplies propeller shafts, valve bodies, and structural castings to the shipyards — most of these suppliers are private, but investors can get indirect exposure through industrial conglomerates.

TransDigm Group (TDG) is worth understanding here as a model: it acquires sole-source aerospace and defense components businesses that supply complex platforms, and while its primary market is aviation, its acquisition strategy extends to naval subsystems. Investors watching the naval buildout for second-derivative plays should monitor TransDigm's acquisition announcements for naval-adjacent targets. Similarly, Curtiss-Wright (CW) is a frequently overlooked name that supplies naval nuclear instrumentation and control systems directly to shipyards and to BWXT — it is smaller than the primes but more purely exposed to the nuclear-naval supply chain.

The castings and specialty-metals tier is the most illiquid part of the supply chain from an investor's standpoint, but it is also the most capacity-constrained. The Government Accountability Office has repeatedly flagged that submarine production delays are caused not by yard capacity but by supplier bottlenecks in propulsion castings and specialty electronics. When Congress responds by funding industrial-base expansion grants (as it has under recent NDAA provisions), the smaller suppliers — even if private — create observable demand for the raw materials and capital equipment that public companies supply.

The AUKUS security agreement — announced in 2021 between the United States, United Kingdom, and Australia — created a new external demand signal for U.S. naval industrial capacity. Under Pillar I of AUKUS, Australia will acquire at minimum three to five Virginia-class nuclear-powered submarines built in the United States, with the option of Australian-built vessels using American designs later in the decade. This is the first time the U.S. has agreed to export nuclear-powered submarines to any ally since the 1958 UK arrangement.

For publicly traded companies, the AUKUS effect is most direct at HII and GD Electric Boat, which must expand yard capacity and workforce to produce Australian-earmarked hulls on top of the U.S. Navy's own requirements. BWXT benefits identically — it already supplies UK reactors and will supply the additional Australian-fleet reactors. For investors, AUKUS is a demand floor that is politically bipartisan and treaty-backed, making it more durable than a single year's defense-budget negotiation.

Tracking AUKUS: the Joint Steering Committee meetings between U.S., UK, and Australian defense officials produce public communiques that detail milestone timelines. When those communiques confirm the first submarine purchase agreement or production commencement, it represents incremental funded backlog for the named primes. The Australian Department of Defence also publishes its own budget papers with AUKUS line items, which are a secondary confirming signal available to any investor willing to read a foreign government document.

Naval shipbuilding spending is more predictable than almost any other government program because its drivers are public, recurring, and long-lead. The President's Budget Request (released in February) contains the Navy's shipbuilding plan with specific ship counts by class and year. The House and Senate Armed Services Committees mark it up in spring, and the final NDAA is typically signed by December. The Navy's own 30-Year Shipbuilding Plan — released annually, usually in March — is the single most useful planning document an investor can read; it shows not just this year's buy but the projected buy rate for three decades, which maps directly onto the primes' long-range revenue models.

Beyond the budget cycle, Pentagon daily contract announcements (available at defense.gov/News/Contracts/) publish every awarded contract above $7.5 million, including shipbuilding, combat systems, and propulsion awards, the same day they are awarded. Setting a daily alert or scraping this page for the names HII, General Dynamics, Raytheon, Curtiss-Wright, or BWXT gives an investor near-real-time insight into where dollars are flowing without requiring access to proprietary research. The Office of the Secretary of Defense also publishes Selected Acquisition Reports for major programs, which show cost and schedule variances — a program slipping schedule is a warning; one running on schedule with increasing quantities is a tailwind.

For a macro trigger, watch the Quadrennial Defense Review (when issued) and the National Security Strategy — these set the political framing that drives multi-year budget bets. A document that names China as the primary pacing threat and emphasizes the Indo-Pacific virtually guarantees increased naval spending in subsequent budgets, because the Pacific is an ocean that requires ships in a way that no other theater demands.

Naval buildout is a durable theme, but it is not risk-free. The most common disruption is continuing-resolution government funding: when Congress fails to pass a defense appropriations bill and funds the government at prior-year rates, multi-year procurement contracts cannot be awarded, advance procurement funding for long-lead materials stalls, and shipyards cannot hire to support an anticipated ramp. This has been a recurring problem and typically causes short-term earnings misses at the primes without altering the long-term backlog picture.

Program execution risk is concentrated at the primes. Both HII and General Dynamics have experienced significant cost overruns and schedule delays on individual ship classes — the Ford-class carrier program is the canonical example, where HII absorbed substantial fixed-price losses during the lead-ship delivery period. When a new ship class enters low-rate initial production, investors should expect the first one to two hulls to carry higher execution risk than follow-on vessels. Following the primes' quarterly earnings for commentary on specific programs' cost-at-completion estimates is the best early warning system.

Geopolitical de-escalation is the theme-level risk: a negotiated reduction in U.S.-China tensions or a significant budget reconciliation that forces Pentagon cuts could slow the buy rate. However, the structural case for naval investment rests not just on China but on global maritime traffic security (Red Sea, Black Sea, Taiwan Strait), the AUKUS treaty obligation, and the sheer age of the current fleet — average destroyer age is now over 15 years. These factors make an abrupt multi-year spending reversal politically difficult, though investors should watch for any bipartisan commission recommending force-structure changes that shift investment from large surface combatants to smaller, distributed platforms, which would reallocate spending within the sector rather than eliminate it.