Most discussion of defense tech investing focuses on equity rounds and exits — the seed, the Series A, the strategic acquisition. The financial reality of building hardware in defense is more layered than that. A recent capital roadmap from Silicon Valley Bank, written for founders, lays out the operational truth: capex-intensive defense companies rely on a stack of capital instruments throughout their entire lifecycle, not just equity. For investors, understanding that stack is a useful lens on which companies are built to scale.
What hardware defense actually requires
Hardware defense companies have four structural realities that distinguish them from software-first startups.
Capital intensity. Non-recurring engineering, equipment, facilities and inventory all require substantial upfront investment, often before material revenue.
Long timelines. The path from prototype to fielded product can take years of testing and validation. Government procurement adds years of source selection, contracting, and budget cycles on top of that.
Nonlinear, milestone-driven revenue. Revenue arrives in lumps tied to government awards or prime contractor relationships, with 30-to-180-day payment cycles. The gap between performing on a contract and being paid for it creates working capital pressure that doesn't exist in subscription businesses.
Regulatory load. ITAR, EAR, CMMC, facility clearances — each adds cost that has to be funded before the revenue arrives.
None of this is new. The financial implication is what matters: companies operating under these conditions need a layered capital stack, with each layer serving a specific purpose, or they end up using equity for things equity isn't designed for.
The layers
Equity sits at the top. It funds R&D, key hires, and milestones that increase enterprise value. That's the layer most defense tech writing focuses on.
Underneath it sits a set of instruments that get less coverage. SBIR and STTR grants provide non-dilutive validation capital in the early years. Venture debt extends runway after an equity round, typically at 20-40% of the round size with a 12-18 month interest-only period. AR-backed lines unlock cash tied up in unpaid government and prime contractor invoices — critical given the 60-to-180-day payment cycles that government and prime contracting impose. Purchase order financing fills the gap between winning a contract and being paid for its delivery. Equipment finance funds depreciating manufacturing assets at 80-100% over three-to-five-year terms. Trade finance and letters of credit bridge the gap between supplier payment terms and customer payment terms.
The point isn't that every defense tech company needs all of these. It's that the companies that thrive build the layers they need before they need them, and the companies that don't end up either diluting heavily, missing production windows, or trying to raise debt under duress, which often fails.
The principle, as one recent lender's playbook put it, is that the best time to raise debt is when you don't need it.
What this means for investors
Three things are worth flagging for capital allocators thinking about defense tech.
The first is diagnostic. When evaluating a portfolio company or a new opportunity, the capital stack tells you something about the founder. Companies that have set up AR-backed lines, secured equipment finance, or layered venture debt onto an equity round are usually run by founders who understand that hardware defense is a working capital business, not just an equity business. Companies that are using equity to fund inventory, working capital, or payment-cycle gaps are doing the equivalent of paying for groceries on a credit card — it works in the short term but compounds badly.
The second is structural. The working capital problem is the same problem that Stanford's Gordian Knot Center framed as Valley Two — the gap between production traction and durable, programmed revenue. Working capital instruments are how companies survive the valley. The crossing happens at the contracts level, but the survival happens at the balance sheet level. Investors who only look at the contracts miss half the picture.
The third connects to the broader allied capital architecture we covered in the pillar piece. The Defence, Security and Resilience Bank's third design function — guarantees that enable commercial banks to lend to defense and security firms across the supply chain — is explicitly about expanding access to this kind of capital stack. If DSRB succeeds, the working capital layer becomes more accessible across the allied industrial base, which lowers the financial fragility of hardware defense companies as a category. That's a meaningful shift in the asset class.
A note on what's missing
Most existing US-focused analysis of defense capital stacks — including SVB's recent roadmap, which informs this piece — focuses on US founders working with US programs and US capital markets. The allied dimension we've been writing about — Australian companies plugging into US and UK supply chains via AUKUS, the emerging multilateral capital architecture around DSRB — is a layer that isn't covered yet, because it's still being built. But the structural logic applies equally. Allied hardware defense companies need the same layered stack to scale, and the institutions being built around AUKUS and DSRB are partly designed to make that stack more accessible across borders.
Hardware defense is a working capital business as much as it is a technology business. The companies that internalize that, and the investors who underwrite to it, are the ones positioned to compound.
