When was Axiom Space founded compared to Sierra Space?

Axiom Space was founded in 2016, and Sierra Space was founded in 2021.

Where are Axiom Space and Sierra Space headquartered?

Axiom Space is headquartered in Houston; Sierra Space is headquartered in Louisville.

Head-to-head · 2026

Axiom Space vs Sierra Space

Axiom's ISS-attached modules vs Sierra's Dream Chaser + LIFE habitat path to a free-flying station.

Side by side

Attribute	Axiom Space	Sierra Space
Founded	2016	2021
Headquarters	Houston, United States	Louisville, United States
Entity type	commercial	commercial
Operational status	operational	development
Sectors	space-stations, human-spaceflight, leo	space-stations, spacecraft, human-spaceflight
Vehicle type	—	spaceplane
Significant people	Michael Suffredini (CEO), Kam Ghaffarian (Co-founder)	Tom Vice (CEO)

What each one does

Axiom Space

Axiom Space is building the world's first commercial space station while conducting pioneering private astronaut missions to the International Space Station. Founded in 2016 by former ISS Program Manager Michael Suffredini and entrepreneur Kam Ghaffarian, Axiom is creating the infrastructure for humanity's transition to commercial space operations. In January 2024, Axiom Mission 3 (Ax-3) launched an all-European crew including astronauts from Turkey and Sweden to the ISS for 18 days, conducting 30 experiments during orbit. Axiom Mission 4 launched in June 2025 carrying the first astronauts from Poland and Hungary to stay aboard the station, commanded by veteran NASA astronaut Peggy Whitson. NASA awarded Axiom a $140 million contract to attach habitable commercial modules to the ISS before separating to form an independent station. The first Axiom module, Hab One, completed critical design review in 2024, with five modules manifested on the station assembly roadmap. The Payload Power Thermal Module is scheduled to launch no earlier than 2027, separating from ISS in 2028, followed by habitat and airlock modules creating a fully functional commercial station before ISS retirement in 2030. Axiom partners with Thales Alenia Space for module construction and SpaceX for crew transportation via Dragon spacecraft. The company broke ground on a major manufacturing facility at Houston Spaceport. Axiom Space continues advancing commercial space station development while providing private astronaut mission services connecting paying customers and international space agencies with ISS research opportunities.

Full Axiom Space profile

Sierra Space

Sierra Space is a commercial space company developing the Dream Chaser spaceplane, Orbital Reef commercial space station, and related space technologies. Spun off from Sierra Nevada Corporation in 2021, Sierra Space is based in Louisville, Colorado, and aims to build commercial infrastructure in low Earth orbit to support NASA, commercial, and international customers. Sierra Space operates as a privately held company backed by strategic investors including General Atlantic, Coatue, and Moore Strategic Ventures. The company employs approximately 1,500 people and is led by CEO Tom Vice. Sierra Space positions itself as a leader in the commercialization of low Earth orbit. ## History and Milestones Sierra Nevada Corporation's Space Systems group developed the Dream Chaser vehicle beginning in 2004, based on NASA's HL-20 lifting body design. The spacecraft competed for NASA's Commercial Crew Program but was not selected. Sierra Nevada pivoted to cargo delivery, winning a Commercial Resupply Services-2 contract in 2016. Sierra Space was established as a separate company in 2021 to focus on commercial space opportunities beyond government contracts. The spinoff attracted significant private investment, valuing the company at over $4.5 billion. In 2021, Sierra Space partnered with Blue Origin to propose Orbital Reef, a commercial space station selected by NASA's Commercial LEO Destinations program. This partnership positions Sierra Space as a potential successor to the International Space Station. ## Products and Services Dream Chaser is a reusable lifting-body spaceplane designed to deliver cargo to the International Space Station and future destinations. The vehicle launches atop a ULA Vulcan Centaur or Atlas V rocket and returns to Earth with a runway landing, enabling rapid payload recovery. Dream Chaser carries both pressurized and unpressurized cargo. The LIFE (Large Integrated Flexible Environment) habitat is Sierra Space's expandable space station module technology. LIFE modules launch compactly and inflate to provide large pressurized volume. This technology is central to Orbital Reef and could support lunar surface habitats. Sierra Space is developing Shooting Star, a cargo module that accompanies Dream Chaser, providing additional volume for supplies and waste disposal. The company also works on space station systems, life support, and related technologies. ## Technology and Capabilities Dream Chaser's lifting body design provides cross-range capability during reentry, enabling landing at multiple locations. The spacecraft is designed for gentle returns (1.5 g maximum), suitable for sensitive cargo including biological experiments. Dream Chaser can land on commercial runways at non-federal spaceports. LIFE habitat technology uses advanced materials to create expandable structures that provide more volume per launch than traditional rigid modules. Sierra Space has conducted full-scale burst tests demonstrating the technology's structural integrity and safety margins. The company develops life support, thermal control, and power systems for space habitats. Sierra Space also works on in-space manufacturing technologies, including plans for industrial facilities aboard Orbital Reef. ## Business and Financial Overview Sierra Space raised approximately $1.4 billion in private funding, including a 2021 Series A at a $4.5 billion valuation. The company generates revenue from NASA contracts, including the Commercial Resupply Services agreement for Dream Chaser cargo flights. Major contracts include NASA CRS-2 (at least six Dream Chaser cargo missions), Commercial LEO Destinations funding for Orbital Reef, and various technology development awards. The company seeks additional commercial and international customers for Dream Chaser and space station services. Sierra Space competes for astronaut and cargo transportation services while developing commercial space station offerings. The company's path to profitability depends on successful Dream Chaser operations and Orbital Reef development. ## Recent Developments In 2024, Sierra Space prepared for the first Dream Chaser mission, completing spacecraft integration and testing. The inaugural flight to the International Space Station was targeted for launch on ULA's Vulcan Centaur rocket. The company advanced Orbital Reef development, conducting system design reviews and component testing. Sierra Space also expanded its LIFE habitat program, completing additional structural tests and advancing manufacturing capabilities. Sierra Space strengthened international partnerships and explored additional commercial applications for its technologies. The company also invested in workforce development and facilities expansion to support upcoming operations. ## Market Position Sierra Space positions itself as a commercial space infrastructure provider, distinct from launch companies like SpaceX or satellite operators. The Dream Chaser and Orbital Reef represent comprehensive solutions for low Earth orbit commercialization. Key competitors include SpaceX (for cargo services and potentially stations), Axiom Space (for commercial space stations), and other companies developing LEO infrastructure. Sierra Space's reusable spaceplane technology offers unique capabilities for cargo return. Competitive advantages include the Dream Chaser's gentle return capability, expandable habitat technology, and diverse technology portfolio. Strategic partnerships with Blue Origin for Orbital Reef and ULA for launch services strengthen the company's position.

Full Sierra Space profile