Mark Cuban never met the founder. He never toured the facility. He simply read an email and wired half a million dollars. That decision, made years ago with little more than instinct, now sits at the center of one of the aerospace industry’s most watched contests. Relativity Space, the company Cuban backed, stands today as a serious rival to SpaceX. Its valuation hovers near $4 billion. It holds nearly $3 billion in customer orders. And its first orbital rocket aims for flight before the year ends.
The story began with a cold pitch. Tim Ellis, a former Blue Origin engineer who once ran the company’s metal 3D-printing efforts, reached out from Dallas. He and his partners wanted to build rockets faster and cheaper than anyone thought possible. Cuban knew next to nothing about space. His reply was blunt. “I don’t know shit about space, but I’ll get you started and see what happens,” he later recalled in a September 2024 interview with podcaster Theo Von. The entire relationship stayed digital. “It was all email. Never met him,” Cuban said. (Fortune, June 2, 2026).
That $500,000 seed money proved enough to launch the venture. Cuban has since added more, bringing his total commitment to several million. He takes no credit for the outcome. “It’s not like I helped them get there. These guys were just insanely smart and good. I got lucky … I just got him started.” Ellis and his team took the funds, joined Y Combinator, and began printing rocket parts at a scale few had attempted. The approach promised to slash part counts dramatically, shorten production timelines, and lower costs enough to challenge established players.
Yet the path was never smooth. By late 2024 Relativity had spent more than $1 billion. Cash flow turned problematic. Leadership changes followed. In March 2025 former Google CEO Eric Schmidt stepped in as chief executive. He made a substantial personal investment and secured a controlling stake. Tim Ellis shifted to the board. The move marked a clear break from earlier strategy. Schmidt, drawing on his technology and national security background, pushed the company to move faster and scale with greater discipline. (Bloomberg, Dec. 17, 2025).
Under Schmidt the focus sharpened on Terran R. This medium-to-heavy-lift vehicle is designed for full reusability. It targets the same market segment dominated by SpaceX’s Falcon 9. Company updates from spring 2026 show steady progress. In April alone engineers released more than 2,000 flight parts. Nearly all first-stage structural components and avionics reached completion, clearing the way for integration. Second-stage tanks and internal structures finished assembly. Avionics trays, harnesses, and valves went into place. Low-voltage checkouts began. All first-stage Aeon R engines for the initial flight were manufactured, assembled, and shipped, with production lines now ramping for follow-on missions. In-house battery output accelerated. Testing at NASA Stennis advanced acceptance runs for engines and full-duration firings for the second-stage Aeon V. (Relativity Space, May 13, 2026).
Launch infrastructure told a similar story. At Cape Canaveral’s Space Launch Complex-16 the water tower climbed to 275 feet. Foundations for the water farm took shape. LOX and LN2 systems saw valve checks and hot fills completed. Steel framing for the flame diverter arrived on site. These details matter. They signal that Relativity has moved past concept work into the final, gritty stages of hardware validation and range readiness. First launch remains targeted for late 2026. No one disputes the schedule carries risk. But monthly updates portray consistent forward motion across design, build, test, and ground systems.
The commercial backlog offers perhaps the strongest validation. NASA, the U.S. Space Force, SES, Intelsat, and OneWeb have collectively committed nearly $2.9 billion. Executives describe the orders as customers voting with their checkbooks for a credible alternative to SpaceX. “The backlog shows how desperate the market is for another cost-effective launch services provider,” Josh Brost, Relativity’s chief revenue officer, told SpaceNews in earlier comments that still resonate. Demand for launch capacity continues to outstrip supply. Any new entrant that can deliver on time and on budget finds eager buyers.
But challenges remain. Relativity once aimed to 3D-print virtually an entire rocket. That ambition encountered limits. Some components proved better suited to traditional methods. The company adjusted. It kept additive manufacturing at the core while incorporating conventional techniques where they delivered superior results or faster timelines. Cash burn earlier in the decade highlighted another reality. Even well-funded space startups can exhaust capital before reaching orbit. Schmidt’s arrival brought not only money but a sharper focus on execution metrics and operational tempo.
Cuban watches from the sidelines with characteristic detachment. He compares the Relativity wager to buying his Dallas mansion sight unseen after seeing only photos. Availability, he believes, creates opportunity. “I’ve done a bunch of deals from people just cold emailing me.” Sometimes the smartest move is simply to respond. His fortune, built on the Broadcast.com sale to Yahoo and the turnaround of the Dallas Mavericks, rests on similar bets. He now pours energy into Cost Plus Drugs, his effort to cut generic medicine prices. Space remains outside his daily orbit. Yet the Relativity stake has already delivered outsize returns on paper.
Meanwhile SpaceX prepares its own historic step. The company filed to go public and eyes a mid-June 2026 Nasdaq listing. Reports suggest a target valuation above $2 trillion. The contrast is striking. One firm, led by Elon Musk, redefined orbital access through rapid iteration and vertical integration. The other, born from an email to a billionaire with no domain expertise, bets that additive manufacturing and disciplined execution can carve out a profitable niche. Both will compete for the same government and commercial payloads in the years ahead.
Industry observers note the broader shift. Launch costs have fallen sharply over the past decade. Reusability changed the economics. Customers now expect lower prices and higher cadence. Relativity’s pitch aligns with that new reality. If Terran R flies successfully in late 2026 and begins flying regularly thereafter, the company could capture a meaningful share of medium-lift demand. Failure, of course, would invite fresh questions about capital intensity and technical risk in the sector.
Recent monthly updates reinforce optimism. Propulsion teams hit key service-life milestones on engines. Structural test stands in Long Beach underwent modifications. An expanded machine shop added powder-bed fusion and CNC capacity. The pace feels measured rather than frantic. No dramatic pronouncements. Just incremental gains across every discipline required to reach orbit.
Cuban’s original investment now looks less like a gamble and more like early recognition of talent. Ellis and his early team possessed deep technical knowledge. They understood both the limits of existing manufacturing and the potential of new methods. Cuban simply opened the door. The founders walked through it, attracted far larger sums from Fidelity, BlackRock, Tiger Global, and others, and built a credible contender. “Coming for you, Elon,” Cuban once quipped. The remark was lighthearted. The underlying competition is anything but.
As the countdown to Terran R’s debut continues, the story offers a reminder. Breakthroughs in complex industries often start small. A single email. A quick decision. Years of persistent engineering. The outcome remains uncertain. Yet the progress to date suggests Cuban’s instinct was sound. Smart people given resources can accomplish surprising things. Even when the investor admits he doesn’t know the first thing about the field.
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