SpaceX IPO: Starlink Went Public. Mars Is Musk's Call.

At 9:30 a.m. Eastern, SpaceX went public on Nasdaq. SPCX opened at $150. It ran to $168.75 by midday, 25% above the $135 IPO price. Market cap hit $2.21 trillion at the high. Elon Musk became the world's first trillionaire.

The people buying SPCX today are not funding Mars. They have almost no say in whether it happens.

Six parts of this series traced the five layers Elon is building: chips from TERAFAB, Optimus robots, xAI's training compute, Starship and grid power. The question underneath all of it: who pays? Today's IPO answers that, partly.

What actually happened on Nasdaq today?

SpaceX raised $75 billion today. It sold 555.6 million shares at $135 each. That is the largest IPO ever — more than twice what Saudi Aramco raised in 2019.

The stock's highest point today was $168.75. At that price, SpaceX was worth $2.21 trillion. Amazon, for comparison, is worth about $2.54 trillion. SpaceX is now worth more than Tesla, which sits at around $1.6 trillion.

Here is the thing most headlines will miss. SpaceX has two types of shares. Musk's shares carry 10 votes each. The shares you can buy carry one vote each. That gap means Musk controls 82.4% of all votes while owning just 42% of the stock. SpaceX confirmed this in its prospectus filed with the SEC on June 3. It is a public company. But it is still Musk's company.

Musk offered up to 30% of the IPO shares to everyday investors. Most IPOs set aside just 5 to 10% for them. That is three times the usual amount and fairly rare for a company this size.

Why Starlink is the real valuation story

The $1.77 trillion valuation is not built on rockets. It is built on Starlink, SpaceX's satellite internet service. No company in this space has matched its revenue.

In 2025, Starlink brought in $10.6 billion. That is 67% of SpaceX's total $18.67 billion. Profit (EBITDA, or earnings before interest, taxes, depreciation and amortization) was $6.6 billion, per the S-1. In just the first three months of 2026, Starlink added $3.26 billion in revenue and $1.19 billion in operating income. Today it has more than 9,800 satellites in orbit and over 10 million customers in 100 countries.

Here is the flywheel. Every Starship launch gets cheaper. Cheaper launches let SpaceX grow Starlink faster. More satellites mean more subscribers. More subscribers fund more Starship flights. Starship was built for Mars. But right now it is also the machine that keeps Starlink growing.

What does the xAI acquisition add to SPCX shareholders?

SpaceX bought xAI in February 2026. That deal brought in Grok, xAI's AI assistant, and the Colossus computing cluster in Memphis. The plan: build data centers in space by 2028.

xAI was spending about $1 billion a month competing with OpenAI, Google and Anthropic. The SpaceX prospectus shows what that looked like in Q1 2026: $818 million in revenue, $2.47 billion in losses and $7.72 billion in capital spending. Joining SpaceX gave xAI access to Starlink's cash to cover those costs.

SpaceX wants to launch satellites that work as AI data centers. The first batch is targeted for 2028. The company is asking the FCC, which regulates communications in the US, for permission to launch up to one million of them. The reason for putting data centers in space: buildings have limits. A data center needs power, cooling, land and permits. A satellite in orbit does not.

Part 3 covered xAI's Colossus cluster: 555,000 GPUs in Memphis, the biggest AI training facility outside Google. Now that xAI is inside SpaceX, the company running those servers also has the rocket that could eventually launch them.

How does the SpaceX IPO change the Mars timeline?

The IPO does not move the Mars date. It changes who funds the road to get there.

Lunar missions still come first. Part 6 covered why. The moon is where the full stack gets tested before SpaceX commits to a 26-month Mars trip with no way back. Musk said in February 2026 that lunar missions would come 5 to 7 years before Mars.

A 2033 uncrewed Mars mission is still a goal, not a locked plan. What changed today: SpaceX can now pay to get there faster. Starlink's revenue already covers daily costs. The $75 billion from today's IPO buys speed across every layer.

The question worth watching: will SPCX's quarterly reports force honest disclosure about where the five layers actually stand? Starship progress, Optimus sales, TERAFAB chip yields and xAI orbital approvals will now appear in SEC filings every three months. That level of scrutiny is brand new for SpaceX.

What should you actually watch instead of the stock price?

Four signals tell you more than the SPCX price chart about whether this stack is becoming real. Watch these — not the stock.

Starlink's subscriber count matters most. The whole valuation assumes growth. At 10 million customers today, the institutional case requires SpaceX to keep adding subscribers, especially in countries where internet cables never reached. If that number flattens, the money case starts to crack.

Watch the xAI orbital compute schedule. SpaceX says the first satellite data centers launch in 2028. If that slips to 2030, the space-based AI part of the story needs a rethink. Check the 10-K annual filings for real engineering milestones. If the language stays at "as early as 2028" with no specifics, that is a signal too.

Watch for the first outside Optimus contract. Tesla uses Optimus robots inside its own factories. That is internal testing. A paying customer outside Tesla is the proof that the robot layer is a product, not still a research project. That contract has not happened yet.

Watch TERAFAB chip cost-per-unit. Optimus only reaches millions of units if the chip inside it gets cheap enough to make the robot affordable. Any Tesla earnings report disclosing chip yields or cost trajectories tells you more than analyst price targets on SPCX.

The SPCX chart will be everywhere for weeks. It is just price. The signal is in those four numbers.

Mars is still Musk's call. The public just bought a seat at the table. They don't get to pick the destination.