Due Diligence Capital Notes

Here is a company that already has $1.22 billion sitting in its bank account announcing a plan to raise another $1.16 billion. Most businesses raise capital because they are running out of it. AST SpaceMobile is raising capital because the thing it is building is expensive enough to consume both piles — and then some.

That tension is the heart of the ASTS story. The company is not a software startup that can scale on a server rack. It is building a cellular broadband network in orbit. Every satellite it launches costs between $21 million and $23 million, it needs roughly 90 of them to deliver continuous global coverage, and the physics do not negotiate on price. Understanding how ASTS is financing that ambition — and whether the math holds together — is what this post is about.

What AST SpaceMobile Is Actually Building

Before we get into the capital structure, let us be precise about the product. AST SpaceMobile's proposition is genuinely unusual: a constellation of large, flat-panel satellites capable of transmitting a cellular signal strong enough to reach an ordinary smartphone — not a special satellite phone, just the device already in your pocket. As the company states in its 424B5 prospectus supplement filed with the SEC on October 23, 2025:

"We are building the first and only global Cellular Broadband network in space to be accessible directly by everyday smartphones (2G/4G-LTE/5G devices) for commercial use, and other applications for government use utilizing our extensive intellectual property and patent portfolio."

The commercial roadmap has three thresholds. Twenty-five satellites (five older Block 1 units plus 20 of the newer Block 2 BlueBird models) are enough for noncontinuous service — meaning a smartphone can connect when a satellite passes overhead, but there are gaps. Forty-five to sixty Block 2 satellites unlock continuous coverage across key markets like the United States, Europe, and Japan. Ninety satellites deliver full global coverage. The company has launch agreements in place for 60-plus Block 2 satellites during 2025 and 2026, and has already signed a definitive commercial agreement with Verizon on October 8, 2025, to begin service across the continental United States in 2026.

That Verizon agreement matters enormously. It transforms ASTS from a deep-technology project into a company with a named distribution partner and a hard commercial deadline. Whether the satellites go up on schedule is what every investor should be watching.

The Dual-Tranche Capital Raise

To fund the constellation build-out and a critical spectrum acquisition (more on that shortly), ASTS executed two simultaneous transactions in October 2025. Together they form a classic dual-tranche offering — a structure where a company raises money through two different instruments at the same time, targeting different categories of investors with different risk-return profiles.

Tranche One: Equity

The equity portion was a registered direct offering — a sale of new shares directly to institutional investors at a fixed price, bypassing a traditional open-market sale. ASTS sold 2,048,849 shares of Class A Common Stock at $78.61 per share, generating approximately $161.1 million in gross proceeds (about $160.2 million net of fees). That is a relatively small dilution against 252,560,668 Class A shares outstanding immediately following the placement — roughly 0.8% of the share count. The equity tranche is not where the heavy lifting happens.

Tranche Two: Convertible Senior Notes

The real capital engine is the concurrent offering of convertible senior notes — bonds that pay a fixed interest rate but give the holder the right to convert the principal into common stock at a predetermined price if the stock appreciates enough to make conversion attractive.

ASTS priced $1.0 billion of 2.00% convertible senior notes due January 15, 2036 — later upsized from an original $850 million target, with an additional $150 million greenshoe option (an overallotment provision that lets underwriters purchase extra notes if demand is strong). At full exercise the offering could deliver up to approximately $1.129 billion in net proceeds. The conversion price is approximately $96.30 per share, which represents a 22.5% premium to the $78.61 offering price on the equity tranche.

Why would a bond investor accept only 2% annual interest — barely above zero in real terms — on a ten-year instrument? The same logic applies here that I described when writing about Strategy's convertible notes: the buyer is not primarily seeking yield. The buyer is purchasing a structured bet that ASTS stock will trade well above $96.30 before 2036. If the satellites launch, Verizon customers start using SpaceMobile service, and revenue scales, the stock could be multiples of that conversion price. The bondholder keeps the bond's face value as downside protection and captures the equity upside if the thesis plays out. The 2% coupon is essentially the cost of that optionality from ASTS's perspective — far cheaper than issuing equity at today's price and locking in permanent dilution.

The Ligado Spectrum Move

Woven into this capital raise is one of the most consequential strategic moves in ASTS's history: the acquisition of up to 45 MHz of lower mid-band spectrum — radio frequencies in a range (roughly 1.4–1.5 GHz) that propagate efficiently through buildings and into smartphones — through what the company calls the Ligado Transaction.

Mid-band spectrum is to wireless connectivity what beachfront property is to real estate. It is scarce, it is regulated, and whoever controls it holds a structural advantage for years. Ligado Networks, which had controlled this spectrum, filed for bankruptcy. ASTS moved to acquire the rights, with the Bankruptcy Court approving the deal on June 23, 2025.

The total cash consideration owed is $550 million: $420 million due October 31, 2025, a further $100 million due March 31, 2026, and $15 million at closing. To fund this without depleting the corporate treasury, ASTS established a $550 million non-recourse senior-secured credit facility at a subsidiary entity called SpectrumCo through Sound Point Capital. Non-recourse means the lenders can only claim the assets of SpectrumCo — specifically the spectrum itself — if things go wrong. They cannot reach up to the ASTS parent company to claw back other assets. This is sophisticated balance-sheet engineering: the spectrum acquisition is financed against the spectrum, leaving the core corporate liquidity available for satellite manufacturing and launches.

In addition to the cash payments, ASTS will issue Ligado's creditors 4,714,226 shares of Class A Common Stock at $0.01 per share — so-called penny warrants that are essentially an additional equity kicker for the sellers.

Reading the Full Capital Stack

Let me put the numbers together so the picture is clear.

Cash on hand (September 30, 2025): ~$1.22 billion
Total debt pre-this-offering: ~$724.4 million (including the $575 million of 2.375% convertible notes issued July 29, 2025, and $100 million residual of older 4.25% notes)
New convertible notes (this offering): up to ~$1.15 billion
New equity (this offering): ~$160 million
Sound Point facility (Ligado / SpectrumCo): $550 million (subsidiary only)
ATM program capacity: $800 million authorized in October 2025; ~$277.4 million in net proceeds already drawn from approximately 3.2 million shares as of October 20, 2025

An ATM (At-The-Market) offering is a mechanism where the company sells shares in small tranches directly into the open market at prevailing prices over time, rather than all at once in a single offering. It is flexible and avoids the pricing discount a traditional large block sale would require.

As the prospectus states, the note proceeds are intended for "general corporate purposes, including without limitation funding the deployment of our worldwide constellation of satellites in anticipation of adding incremental strategic markets for our SpaceMobile Service." In plainer English: build more satellites and launch them.

One more structural note worth understanding: founder Abel Avellan holds all 78,163,078 Class C shares, each carrying up to 10 votes per share, giving him effective voting control of the company until a defined Sunset Date. This is a dual-class share structure — standard for founder-led technology companies — that insulates management from short-term shareholder pressure. Whether you view that as a feature or a bug depends on how much conviction you have in Avellan's execution.

What Could Break This Thesis

Capital Runway Risk

The 90-satellite constellation for full global coverage, at $21–$23 million per Block 2 unit, implies roughly $1.9–$2.1 billion in satellite manufacturing costs alone, before launch contracts, ground infrastructure, and regulatory fees. This offering plus existing cash gets ASTS through the 45–60 satellite threshold for continuous US and European coverage, but not to the end state. The company will need to return to capital markets — via the ATM program, further convertible note issuances, or equity raises — and there is no guarantee those markets will be receptive at favorable terms when the time comes. A prolonged equity market downturn could leave launch agreements unfunded, triggering termination fees that would drain the treasury.

Dilution Accumulation

Between the three series of convertible notes outstanding (the $575 million 2032 notes at 2.375%, the $100 million residual 2025 notes, and now up to $1.15 billion of 2036 notes), plus the ATM program, penny warrants, private placement warrants, and equity incentive plans, the potential share count expansion is very large relative to the current 252 million Class A shares. Each conversion event or ATM sale adds to the denominator — and dilution that is not offset by proportional increases in enterprise value reduces per-share economics. ASTS has no revenue at scale yet to validate the valuations implied by today's share price.

Ligado Transaction Timing Risk

The $420 million Ligado payment was due October 31, 2025 — just days after this offering closed. The Sound Point credit facility that funds it is conditional on regulatory approvals and transaction closing conditions. If those conditions are not satisfied on time, ASTS would need to source the payment from its own treasury, straining the cash position materially.

Satellite Execution Risk

Assembling, testing, and launching 60-plus large satellites in roughly 18 months is an extraordinarily complex logistics challenge. Satellite programs historically overrun on cost and schedule. Every month of delay is a month of revenue not generated while the debt clock ticks at 2% annually on $1.575 billion of convertible notes.

The Forward View

What makes ASTS compelling — and genuinely different from most speculative technology stories — is that the commercial architecture already exists. The partnership with Verizon is not a letter of intent or a pilot agreement. It is a signed definitive commercial agreement for service that begins in 2026. The spectrum acquisition, if it closes as structured, gives ASTS a mid-band frequency position that would cost a new entrant years and billions to replicate.

The investment question is not whether direct-to-smartphone satellite broadband is a real market. Mobile carriers around the world are actively seeking it — coverage gaps cost them subscribers and regulatory goodwill. The question is whether ASTS can execute the capital-intensive deployment phase quickly enough, without fatal dilution or a cash shortfall, to be the dominant operator when the market matures.

At roughly 90 satellites — and the company has launch agreements for two-thirds of that number already in place — ASTS transitions from a pre-revenue infrastructure story into a network with genuine operating leverage. Getting there requires this capital raise to work, the next one after it to work, and every satellite to clear the atmosphere in one piece. That is a long checklist. But the potential on the other side of that checklist — a company that effectively becomes an extension of every major mobile carrier's network, on a planet where roughly 5 billion people still experience coverage gaps — is what keeps this one on my radar.