How primes, subcontractors and suppliers split the value chain

The prime is not necessarily the best engineer in the chain. It is the party that can absorb the biggest contract, manage political risk, and coordinate hundreds of subcontractors without the whole thing collapsing.

Why margin concentrates at the top

Three structural reasons explain why primes keep more of the value they help create.

1. They hold the contract and the risk buffer.

Government contracts often carry fixed-price terms once a design is finalized, meaning cost overruns are the contractor's problem, not the taxpayer's (this is the logic behind Fixed-Price Incentive, FPI, contracts used by DoD). Primes negotiate pricing with government buyers directly. They then push firm, tightly-priced terms down to subcontractors, effectively exporting schedule and cost risk downward while keeping the pricing power upward.

2. They own systems integration.

Nobody else can assemble 1,900 suppliers' parts into a working aircraft or coordinate the sequencing of a rail tunnel. Systems integration is the scarce capability, and scarce capability commands margin. A subcontractor making a single sensor is replaceable; the prime managing the whole platform is not.

3. Barriers to becoming a prime are enormous.

Bidding for a multi-billion-dollar defense or infrastructure contract requires bonding capacity, security clearances, decades of past-performance history, and lobbying infrastructure. In the US, the Federal Acquisition Regulation (FAR), the rulebook governing federal purchasing, sets qualification thresholds that few firms can meet. This is why the same handful of primes (Lockheed Martin, RTX, Boeing, Northrop Grumman, General Dynamics in the US; Airbus, Leonardo, BAE Systems, Thales in Europe) recur across decades of contracts.

A simplified worked example

Take a hypothetical $1 billion infrastructure contract (a rail extension, for illustration; figures are stylized estimates, not from a real project):

| Layer | Share of contract value | Typical margin |

|---|---|---|

| Prime contractor | ~100% (holds full contract) | 8-12% |

| Tier 1 subcontractors (structural, systems) | ~55-65% of value passed down | 4-7% |

| Tier 2/3 suppliers (materials, components) | ~20-30% passed further down | 2-4% |

The prime keeps a mid-teens share of total value as pure margin while subcontracting most of the *work*. Subs further down absorb thinner margins and, critically, bear fixed-price risk on materials whose costs (steel, semiconductors, specialty alloys) can spike after the bid is locked in. When steel prices rose sharply in 2021-2022, it was Tier 2 suppliers, not primes, who took the biggest hit on fixed-price subcontracts signed before the spike.

This is directionally accurate for how large defense and infrastructure programs are structured; real margins vary by program and are often not publicly disclosed in this granularity.

Power dynamics: who can push back

Subcontractors are not powerless, but their leverage depends on how replaceable they are.

• Sole-source suppliers (the only firm that makes a specific jet engine component, for instance) can negotiate hard, because switching costs for the prime are high.
• Commodity suppliers (generic fasteners, standard concrete) have almost no leverage and compete purely on price, which compresses their margins further.
• Primes competing for the same government contract sometimes have to team up as a joint venture or lead a teaming agreement, temporarily flipping the power dynamic if one partner brings a capability the other lacks (rare, but happens in major aerospace bids).

Regulators shape this balance too. The European Union's public procurement directives and the US FAR both include clauses meant to protect small suppliers (set-asides, prompt-payment rules), but enforcement is uneven, and primes have far more resources to navigate compliance than a 50-person machine shop does.

For a practical look at how US federal procurement rules actually work, the Acquisition.gov FAR portal is the primary public source, not simplified, but authoritative.

Where the value chain is shifting in 2026

A few dynamics are reshaping who captures margin:

• Reshoring and supply chain security rules (driven by concerns over Chinese-made components) are forcing primes to requalify suppliers, temporarily increasing leverage for domestic Tier 2/3 firms who meet new sourcing requirements.
• Software and data layers (predictive maintenance, digital twins) are becoming a new margin pool. Companies like Palantir have inserted themselves into defense value chains not as traditional subs, but as data/software layers sitting alongside primes, sometimes contracting directly with government agencies and bypassing the classic tiered structure.
• Consolidation among Tier 1 subs is a slow, ongoing trend. As sub-tier firms merge (fewer, larger suppliers), they gain some pricing power back from primes, because there are fewer alternatives to switch to.

🎬 [VIDEO: "How the Defense Industry Actually Works" - youtube.com/@WendoverProductions - a clear breakdown of prime/subcontractor structure in modern defense procurement, useful for visualizing the tiered value chain described above]

Reading a contract chain in practice

When assessing any public mega-contract, ask:

1. Who holds the direct government contract? That party has pricing power and reputational exposure.

2. How many alternative suppliers exist for each critical subsystem? Fewer alternatives means more leverage for that supplier.

3. What pricing structure governs each layer? Fixed-price contracts push risk downward; cost-plus contracts (where the buyer reimburses costs plus a fee) spread risk more evenly but are less common at lower tiers.

4. Is there a new entrant (software, data, materials innovator) disrupting the traditional tier structure? These entrants often capture disproportionate margin precisely because they don't fit the old bidding rules.

Key Takeaways

• Value chains in defense and infrastructure mega-contracts are tiered: prime contractor, Tier 1 subs, Tier 2/3 suppliers, each layer absorbing progressively more execution risk for progressively thinner margins.
• Primes concentrate margin because they hold the government contract, own systems integration, and face enormous barriers protecting their position (clearances, bonding, past performance under rules like the FAR).
• Fixed-price contracting structures let primes push cost and schedule risk down the chain, which is why input price shocks (steel, semiconductors) hit subcontractors hardest.
• Supplier leverage depends on replaceability: sole-source component makers can negotiate hard, commodity suppliers cannot.
• New entrants, especially software and data firms, are starting to bypass the traditional tiered structure entirely, contracting directly with government buyers and capturing margin pools that didn't exist a decade ago.