Most small-satellite volume never reaches an independent bus builder. Of the 4,466 small satellites launched in 2025, 3,511 belonged to broadband megaconstellations, and the two largest Western operators among them by satellites launched that year, SpaceX and Amazon, build their own spacecraft. The merchant pool is drawn from the remaining satellites, less those built by state manufacturers in China and Russia and less those built in-house by their own operators.

My analysis starts from a deal. On 28 September 2026, satellite builder Astro Digital agreed to go public through a merger with Proem Acquisition Corp I. Astro Digital’s combination prices a small builder at a higher multiple of revenue than the market gives York Space Systems, the largest listed pure-play builder, on one basis: enterprise value over 2026 revenue, using Astro’s unaudited projection and York’s guidance at its 6 August 2026 share price. York’s share price fell between its January 2026 IPO and August 2026.

I sized only what independent builders can sell: small-satellite buses, and the spacecraft built on them, sold to U.S., European and allied operators. On that definition the Western merchant small-satellite bus market was worth about $2.0 billion in 2025. Published satellite-bus estimates cover all mass classes and appear to include satellites that operators build for themselves, although the publishers do not say so.

Inside that market, my reading is that profit sits with small, mission-configurable builders rather than with capacity-scale producers. On a GAAP net-income basis, York Space Systems lost money on its 2025 revenue, while Astro Digital earned a profit, in unaudited management figures. On the companies’ own EBITDA measures, which are non-GAAP and defined differently, GomSpace and AAC Clyde Space reported positive margins for the first half of 2026, and York a negative one. Scale can still earn gross margin: Rocket Lab’s Space Systems segment earned one in the second quarter of 2026, inside a company that reported a net loss. The argument concerns profit after operating costs. For anyone sizing up a bus builder, as an investor or as a customer, the basis of each profit figure is part of the answer.

The full analysis, with the forecast under three scenarios, the segmentation by mass class, end user and buyer geography, the builder economics and the company profiles, is in my Small Satellite Bus Market report.