Due Diligence Capital Notes

Losing a $155 million satellite is, by any measure, a bad day at the office. On April 19, 2026, AST SpaceMobile watched its Block 2 BB7 spacecraft de-orbit after the New Glenn 3 upper stage deposited it into a trajectory too low for its onboard thrusters to correct. The satellite separated cleanly, powered on successfully, and then — within hours — was gone. That write-off will land in Q2 2026 financials like a depth charge: $155–$160 million, gone.

And yet, if you step back from that single event and look at the full picture AST SpaceMobile painted in its Q1 2026 10-Q filed May 11, 2026, the story is stranger and more interesting than the headline suggests. The company ended March 31 with $3.03 billion in unrestricted cash. Revenue — something ASTS barely had a year ago — jumped roughly 20x year-over-year to $14.7 million. And the company now sits on approximately $1.2 billion in remaining performance obligations, a fancy term for contracted future revenue it hasn't recognized yet. How does a company absorb a satellite loss of that magnitude and still look relatively healthy? The answer is financial engineering — specifically, a $1.075 billion convertible note offering executed in February — and what that tells us about the true nature of this bet.

What a Convertible Note Actually Is (and Why ASTS Relies on Them)

Before we dig into the numbers, it's worth pausing on the instrument ASTS keeps returning to: convertible notes (also called convertible bonds). A convertible note is debt that pays interest — but also gives the lender the option to convert their loan into company stock at a predetermined price instead of receiving cash repayment. The appeal for lenders is that if the stock surges, conversion gives them outsized upside. The appeal for the borrower is that the conversion feature lets them offer a lower interest rate than they'd pay on straight debt.

ASTS's February 2026 issuance — $1.075 billion in 2036 2.25% Convertible Notes — is a textbook example. A 2.25% interest rate on a pre-commercial, loss-making space infrastructure company would be essentially impossible to achieve without that conversion sweetener. For context, ASTS posted a net loss attributable to common stockholders of $(191.0) million in Q1 2026 alone, equal to $(0.66) per share. No conventional lender offers ten-year money at 2.25% to a company burning cash at that pace. The convertible note format threads a needle that straight debt simply cannot.

The simultaneous debt restructuring matters too. When ASTS issued the new 2036 notes, it used part of the proceeds to repurchase $250 million of its 2032 2.375% Notes and approximately $46.5 million of its 2032 4.25% Notes via induced conversions — a process where the company offers note holders an extra sweetener (above the original conversion terms) to convert their bonds to equity early. That sweetener cost ASTS roughly $88.7 million in non-cash charges in Q1 alone. It's not a free lunch, but it extended the debt maturity wall and reduced near-term repayment pressure.

Breaking Down the Capital Stack and What It Funds

Let me map out where ASTS actually stands, because the balance sheet is both the company's greatest asset and its most significant vulnerability.

$3.03 billion in unrestricted cash (plus $430 million in restricted cash, for a total of $3.46 billion). This is the runway. At Q1's operating cash burn of $(48.1) million and capital expenditure of $261.6 million — so roughly $310 million in combined outflows in a single quarter — the company has roughly two to three years of runway before needing to raise again, assuming burn rates hold. They won't hold; constellation deployment accelerates costs. But the cushion is real.
$1.32 billion in satellite construction in progress on the balance sheet. This is the steel-and-silicon embodiment of the thesis: advance payments, materials, and launch deposits for satellites that don't yet exist in orbit. It's the largest single line item that tells you what the company is actually doing with its capital.
$3.02 billion in total gross debt, split across three main instruments: $1.150 billion in 2036 2.00% Convertible Notes (issued earlier), $1.075 billion in the new 2036 2.25% Notes, $325 million in remaining 2032 2.375% Notes, and a $420 million UBS Bridge Financing Loan. The debt stack is long-dated — the two largest chunks don't mature until 2036 — but it is substantial. Total assets of $6.05 billion against $3.02 billion in debt implies a leverage ratio that demands successful commercial execution to justify.
Class A shares outstanding rose from 208.2 million at December 31, 2024, to 298.7 million as of May 7, 2026 — a 43% increase in under 18 months. That growth comes from equity-financed note repurchases, at-the-market share issuances (selling shares into the open market gradually to raise cash), and RSU vesting for employees. The dilution is real and ongoing. Each new share means existing shareholders own a slightly smaller slice of the same pie.

The Satellite Picture: One Step Forward, One Step Back

The hardware story is where this gets genuinely compelling — and genuinely painful.

On February 10, 2026, ASTS successfully deployed the Block 2 BB6 satellite. This is not a routine upgrade. The Block 2 generation features a phased array — the flat antenna that communicates directly with your phone — of approximately 2,400 square feet. As the 10-Q describes it: "the largest phased array ever deployed in a LEO for commercial use, which is more than three times larger than the phased array of the Block 1 BB satellites and designed to deliver up to 10 times the bandwidth capacity." Three times the physical size, ten times the bandwidth. That step-change in capability is the engineering moat ASTS is building.

Then came April 19. The New Glenn 3 mission — Blue Origin's rocket — placed BB7 into a lower orbit than planned. The satellite did everything right: it separated, it powered on. But the altitude was simply too low for the onboard thrusters to raise the orbit to operational levels. As stated in the 10-Q: "the altitude was too low to sustain operations with its on-board thruster technology and was de-orbited." The estimated carrying value on the books: $155–$160 million. That write-off hits Q2 2026 results. Shareholders should expect an ugly quarter on paper.

There are now five Block 1 BlueBird satellites in orbit. Block 2 has one operational satellite (BB6) and one write-off (BB7). The constellation needed for commercial service is far larger — think dozens to eventually hundreds of satellites. The gap between where ASTS is and where it needs to be is the central tension of the whole investment thesis.

Revenue: Real, But Not the Revenue That Matters Yet

Here's the nuance that the headline $14.7 million revenue figure requires. That 20x year-over-year jump — from $0.7 million in Q1 2025 to $14.7 million in Q1 2026 — is real money from real customers. But it's not SpaceMobile Service revenue. It is entirely from gateway equipment and software sales to mobile network operators (MNOs) — the terrestrial infrastructure pieces that MNOs like AT&T, Rakuten, and others need installed before they can connect their subscribers to ASTS satellites. Think of it as ASTS selling the pipes and plumbing into partner networks before the actual water service begins.

Zero SpaceMobile Service revenue has been recognized to date. The ~$1.2 billion in remaining performance obligations — contracted, binding commitments from MNO partners — represents the future revenue ASTS expects to eventually earn, but the filing notes that only 8.4% of it is expected to be recognized in the next 12 months. The rest sits beyond that horizon, contingent on the constellation being built and activated. "The Company expects to recognize approximately 8.4% of its remaining performance obligations as revenue over the next 12 months and the remainder thereafter," the 10-Q states.

That's the fundamental tension of the ASTS investment. The backlog is substantial. The partners are real. But the commercial revenue is almost entirely in the future, dependent on execution that requires hundreds of millions more in capital spend, multiple successful launches, regulatory approvals in dozens of jurisdictions, and MNO integration at scale.

What Could Break This Thesis

Let me be direct about the failure modes, because there are several that deserve serious weight.

Launch vehicle failures are not recoverable events. The BB7 loss wasn't an anomaly in the history of space launch — it was a reminder that orbital mechanics are unforgiving. Each Block 2 satellite carries a $155–$160 million balance sheet value. A string of launch failures doesn't just hurt the income statement; it sets back the commercial timeline by months or years. Insurance recovery is uncertain and often partial.
Commercial rollout has no proven revenue. ASTS has never recognized a dollar of SpaceMobile Service revenue. The transition from "MNO partners are buying our gateway equipment" to "subscribers are using space-based connectivity and generating recurring revenue" is the single largest execution leap the company has to make. It requires MNO network integration at scale, consumer-facing product reliability, and regulatory clearances in each country. Every one of these is a gate that can delay the thesis.
The debt load is real, and dilution is ongoing. $3.02 billion in gross debt against a pre-commercial revenue profile is aggressive. The accumulated deficit stood at $(1.02) billion as of March 31, 2026. The convertible notes have stock-price-dependent conversion triggers — holders can convert at 130% of the conversion price — meaning that a strong stock price paradoxically accelerates dilution. The share count grew 43% in 18 months. If the company needs to raise more capital before achieving commercial scale, that trajectory continues.
The BB7 write-off is a known event; unknown events are the bigger risk. The Q2 2026 $155–$160 million write-off is already telegraphed. What the market hasn't priced is the possibility of further launch failures, technical malfunctions on deployed satellites, or a prolonged timeline to constellation completion that stretches cash further than current models assume.

Conclusion

ASTS is a company making a $6 billion balance sheet bet — with a meaningful portion of other people's money — that direct-to-device satellite connectivity becomes a global infrastructure layer within this decade. The Q1 2026 numbers confirm that it has the cash ($3.03 billion unrestricted), the partners (roughly $1.2 billion in contracted obligations), and the hardware capability (BB6's 2,400 square foot phased array) to make that bet credibly. The February convertible note offering was executed skillfully, extending the maturity wall to 2036 and rebuilding the cash cushion after an aggressive capex year.

But the BB7 loss is a useful forcing function for clarity. This is a business where a single rocket misfiring costs more than Q1 revenue, where commercial launch remains years away, and where the share count can grow 40% in 18 months without delivering a single dollar of SpaceMobile Service revenue. The question isn't whether the technology works — BB6 in orbit is evidence it does. The question is whether the balance sheet is deep enough, the launches reliable enough, and the commercial runway long enough to close the gap between "promising infrastructure bet" and "cash-generating network." As of Q1 2026, ASTS is firmly, expensively, in that gap.

Primary source: AST SpaceMobile 10-Q for the quarter ended March 31, 2026 — SEC EDGAR, filed May 11, 2026.