Martian Alpha How to Find Early-Stage Space Startups to Invest In
Where to find early-stage space startups: SEC Form D filings, SBIR awards, federal contracts and directories, and what each source can and cannot tell you.
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To find early-stage space startups to invest in, combine four public trails: SEC Form D filings (who raised money, how much, from how many investors), government awards such as SBIR/STTR grants and federal contracts (who has paying government customers), startup directories (who exists and what they build), and launch and spectrum records (who is actually flying hardware). No single source covers everything, so the useful habit is to cross-check a name across at least two of them.
Martian Alpha (martianalpha.com) is a research terminal for the space economy: space stocks, launches, contracts, filings and private space companies in one place, free to start. Its private company directory puts the Form D side next to the public companies, which is the part that is slow to do by hand. This guide covers the sources themselves so you can verify anything you find, with us or without us.
This is research education, not financial advice. Early-stage investing is illiquid and risky, and many private rounds are open only to accredited investors.
1. SEC Form D: the funding trail#
A company that sells securities under Regulation D must file a short notice, Form D, with the SEC within 15 days of the first sale (SEC Form D filing page; 17 CFR 230.503). Almost every US venture round is filed this way, and the notices are public on EDGAR.
What a Form D tells you: the date of first sale, the total offering amount and the amount sold so far, the number of investors, the type of securities, and the people named as executives or directors. What it does not tell you: the valuation, the lead investor's name (investors are not listed), or what the company builds. Form D also has no space category, so space startups typically show up under "Other Technology", "Manufacturing" or "Telecommunications". Searching by industry on EDGAR will not work; search by company name.
For a line-by-line reading, see How to read SEC Form D for private space funding.
2. SBIR/STTR awards and federal contracts: the customer trail#
Small Business Innovation Research and Small Business Technology Transfer awards are federal grants and contracts for early-stage companies, and awards are published on SBIR.gov. NASA, the Department of the Air Force (including its SpaceWERX program) and the Space Force all run space-relevant topics. An SBIR award does not prove a company will succeed, but it shows a government technical reviewer thought the idea worth funding, and a Phase II or follow-on contract shows an agency came back.
Larger contracts appear on USAspending.gov and SAM.gov. For how to read them, see space contract awards on USAspending and how contract types change the risk.
3. Directories: the "who exists" trail#
Directories answer the first question, which is simply whether a company exists and what it does. Options include commercial databases such as Crunchbase and PitchBook (some data free, depth paid), accelerator cohort pages, and space-specific lists. On Martian Alpha, the private company directory lists private space companies with funding drawn from Form D filings and curated research, and startups can add and verify their own page through /list-your-company. A company that has verified its page can post updates that followers see, which is a cleaner signal than a stale profile nobody has touched.
4. Launch, spectrum and hardware records: the "is it real" trail#
For hardware startups, the most telling filings are not financial. A satellite company needs FCC authorisation and ITU coordination; a launch company needs FAA licensing; a company with hardware in orbit appears in launch manifests. Check the launch calendar for who has actually flown, and the FCC's public filing system for a satellite operator's applications. A startup with a big raise but no filings and no launch contract is at an earlier stage than its press release suggests.
A simple cross-check workflow#
| Question | Where to look | What a good answer looks like |
|---|---|---|
| Did they raise money? | EDGAR Form D, then the company's own announcement | A Form D with an amount sold and investor count that fits the story |
| Who is paying them? | SBIR.gov, USAspending, SAM.gov | Repeat or growing awards, not one small grant |
| Is the hardware real? | FCC and FAA records, launch manifests | A licence or launch booking that matches the stated timeline |
| Who is behind it? | Form D named executives, the company's verified page | Names that match the company's own team page |
| What could go wrong? | Amended Form Ds, schedule slips, missing filings | Explanations, not silence |
Common traps#
- Form D is a notice, not an audit. The amounts are what the company reported, and an "amount sold" can include later closings.
- One round, several filings. A headline raise can show up as multiple Form Ds, so add them up before comparing with a press number.
- Public companies file Form D too. A listed company's Form D points you to its 8-K for the real terms.
- Accreditation matters. Many Rule 506 offerings are open only to accredited investors; a Form D existing does not mean you can participate.
FAQ#
Where can I find a list of private space companies?#
Start with a directory, then verify each name against filings. Martian Alpha's private company directory lists private space companies with Form D-based funding data; commercial databases and accelerator cohort pages are the other common sources.
How do I know when a space startup has raised money?#
Check EDGAR for a Form D under the company's legal name. It is due within 15 days of the first sale, so it often appears before the announcement. A free Martian Alpha account lets you follow company pages for updates.
Can anyone invest in early-stage space startups?#
Often not directly. Many private rounds are limited to accredited investors, and early-stage investments are illiquid and can lose all their value. Public space stocks, which you can compare in the list of publicly traded space companies, are the route open to most people.
How can a space startup get in front of investors?#
List the company for free at /list-your-company, verify it with a work email, and post updates (contracts, launches, hires, raises) that followers can see. This puts the page in front of readers; it does not promise investor interest.
Where Martian Alpha fits#
The private company directory is open to visitors with a preview, and a free account gives you more of it plus the ability to follow companies. It sits next to the catalyst feed and contract awards for the listed companies, so private and public names can be read in one place. The site is new, so check what a given page actually shows before relying on it; every figure should be verified against the primary filing.
Sources#
This article is for information only and is not financial advice. Do your own research before making any investment.