Aerospace Startups to Watch in 2026: Who’s Funded and Who’s Flying

The aerospace startups worth watching in 2026 are Stoke Space, Impulse Space and K2 Space in US space; Isar Aerospace, The Exploration Company and India’s Skyroot Aerospace outside the US; and Hermeus, JetZero and Boom Supersonic in aviation. Each has either raised a nine- or ten-figure sum recently or put hardware in the air. The best have done both.

The backdrop shifted in June 2026, when SpaceX listed on Nasdaq at $135 a share, valuing it at about $1.77 trillion. Reuters tied that listing to a friendlier fundraising climate, and some of the sector’s largest private rounds followed.

The shortlist: money vs. proof

Funding headlines are easy to find; matching them to what each company has flown is harder. I sort aerospace startups on a simple proof ladder: 1 is ground testing, 2 is test flights, 3 is a full mission success, and 4 is repeat paying service.

Sources: company announcements, Reuters, Bloomberg and TechCrunch, as of October 2026. Ladder ratings are my assessment.

Notice the mismatch. The two rockets that reached orbit this year came from Isar and Skyroot, not from Stoke, which has raised far more and is still working toward its first orbital flight. Big rounds buy time and factories. They don’t buy physics.

Space startups

Stoke Space

Stoke is building Nova, a fully reusable rocket, upper stage included. In September 2026 it completed the initial closing of a $1 billion Series E led by Point72 Ventures and Spark Capital, taking total funding to $2.3 billion, TechCrunch reported. It didn’t disclose a valuation. The money is meant to get Nova to orbit and fund a larger second-generation vehicle.

Impulse Space

Founded by former SpaceX propulsion chief Tom Mueller, Impulse builds spacecraft that move satellites around after launch. Its Series D reached $808 million in September 2026, and a source told Reuters the extension valued Impulse at $5.4 billion. Its Helios kick stage, built to move payloads from low orbit to geostationary orbit in under a day, is slated to fly in 2027. Impulse also holds a place on the US Space Force’s National Security Space Launch Phase 3 Lane 1 contract.

K2 Space

K2 builds unusually large, high-power satellites for data-heavy communications and defense missions. It raised a $500 million Series D at a $6.8 billion valuation in July 2026, Bloomberg reported, co-led by Kleiner Perkins and Iconiq. That’s the highest disclosed valuation on this list, so the next test is how quickly the money turns into satellites in orbit.

Isar Aerospace

Munich-based Isar’s Spectrum rocket failed shortly after liftoff on its first flight in March 2025. On September 5, 2026, its second flight from Andøya Spaceport in Norway reached orbit and deployed its payloads, the first orbital launch by a European commercial provider from continental Europe. Isar had raised a €270 million Series D in June 2026 to ramp up serial production.

The Exploration Company

This German-French company is building Nyx, a reusable cargo capsule. Its Mission Possible demonstrator reached orbit and survived re-entry in June 2025 but was lost before splashdown. In September 2026 it announced a $450 million Series C co-led by Bessemer Venture Partners, Atomico and EQT’s Scaleup Europe Fund, which it described as the largest Series C for a European space company.

Skyroot Aerospace

Hyderabad’s Skyroot launched Vikram-1 from Sriharikota on July 18, 2026, and reached orbit on the first attempt, the first privately developed Indian rocket to do so. Its smaller Vikram-S flew a suborbital mission in 2022. It’s the clearest sign yet that India’s 2020 decision to open space to private companies is producing flight hardware.

Aviation startups

Hermeus

Founded in Atlanta in 2018, Hermeus is building uncrewed aircraft meant to reach hypersonic speeds for the US military. In April 2026 it raised $350 million, made up of a $200 million Series C led by Khosla Ventures and $150 million of debt, at a $1 billion valuation. Its Quarterhorse Mk 2.1 test aircraft, powered by a modified Pratt & Whitney F100 engine, first flew in March 2026. Hermeus sits where aerospace overlaps with defense tech startups, which is where much of 2026’s money has gone.

JetZero

Long Beach-based JetZero is designing the Z4, a roughly 250-seat blended-wing airliner. It raised a $175 million Series B led by B Capital in January 2026, taking total funding past $1 billion, and added a loan facility of up to $100 million in August. United Airlines has a conditional path to buy up to 200 aircraft, and a full-scale demonstrator is targeted to fly in 2027.

Boom Supersonic

Denver-based Boom’s XB-1 demonstrator broke the sound barrier on January 28, 2025. Its Overture airliner is still in development, so certifying and selling a commercial supersonic jet is still ahead.

Which aerospace startups have already gone public?

Several names that still appear on “startup” lists aren’t private anymore. SpaceX listed on Nasdaq in June 2026. Firefly Aerospace went public on Nasdaq in August 2025. Air-taxi developers Joby Aviation and Archer Aviation have traded publicly since 2021. Without private-market access, those are the obvious names to research, which isn’t the same as a reason to buy.

Who are the big 5 in aerospace?

There’s no official list. Rankings by revenue usually name Boeing, Airbus, Lockheed Martin and RTX, with the fifth slot going to Northrop Grumman, General Dynamics or GE Aerospace depending on whether the list leans toward defense or engines. They matter here as customers, suppliers and investors: RTX’s venture arm backs both Hermeus and JetZero, and Northrop Grumman joined JetZero’s Series B.

Do aerospace engineers typically earn $200,000 a year?

No. The median annual wage for US aerospace engineers was $134,830 in May 2024, according to the Bureau of Labor Statistics, and the top 10% earned more than $205,850. So $200,000 is top-decile pay. Startups often pay less cash than large contractors and make up the gap with equity, which is only worth something if the company reaches step 4 on the ladder.

Our read: how to judge an aerospace startup

Treat the round size as a measure of ambition, not progress. A $1 billion raise tells you investors think the prize is enormous. It doesn’t tell you the rocket works. The better signals are flight results, paying customers (government contracts often fund development years before commercial demand shows up) and how much of the funding is debt.

By that test, the most de-risked names here in October 2026 are Isar and Skyroot, with orbits on the board, and Impulse, which pairs flown hardware with Space Force work. The highest upside, and the most left to prove, sits with Stoke and JetZero. If the funding jargon in these headlines is new to you, here’s what a Series C round actually signals.

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