SpaceX S-1 filing reveals Starlink growth and Starship cost hurdles

SpaceX’s S-1 filing—the registration document submitted to the U.S. Securities and Exchange Commission for an initial public offering—reveals the financial mechanics of its satellite communications network, Starlink. While Starlink serves as the primary revenue driver for SpaceX, bringing in $11.4 billion in connectivity business revenue last year, the business requires massive, continuous capital expenditure. To maintain its current service levels, SpaceX needs to replace about a fifth of its satellites annually. This ongoing replacement cycle has forced the company to invest $11.4 billion in its satellite business since the beginning of 2023. By comparison, SpaceX spent $8.4 billion on Starship and its launch infrastructure during the same period.

According to the SpaceX S-1, full reusability of the Starship rocket is not necessary to launch the new generation of Starlink satellites. However, failing to achieve reusability would severely impact the economics of the launch system. Satellite market analyst Tim Farrar noted that without reusability, Starship’s launch costs may not be much lower than those of the Falcon 9, even if the rocket achieves its full 100 ton capability. Farrar wrote that the cost per launch “may be as much as $100M (i.e. $1000 per kg) while tempo remains constrained by the rate at which second stages can be manufactured and first stages can be refurbished.” While an expendable Starship could keep SpaceX in business, it fails to achieve the cost reductions or business models CEO Elon Musk is betting on.

At the same time, the financial data indicates that Starlink’s growth is slowing. The service currently has just over 10 million subscribers, and space consulting firm Quilty Space projected the company would reach 16.8 million subscribers by the end of the year. However, Starlink’s average revenue per user (ARPU) has fallen from $99 in 2023 to $66 in the first quarter of 2026. This decline is driven by Starlink’s expansion into new international markets where it cannot charge as much as it does in developed economies. Tim Farrar reported that the market for space broadband may be smaller than players anticipated, which presents a challenging growth outlook for SpaceX and competitors like Amazon, which is building a Leo (Low Earth Orbit) network and is required to launch 1,600 internet satellites by July.

Why it matters

SpaceX’s S-1 filing reveals that while Starlink is a major revenue driver, the company faces significant capital expenditure challenges and slowing growth. This casts doubt on the necessity and economic viability of its Starship reusability goals.