MentionFox lists 18 Aerospace and defense companies for 2021. Of them, 18 are Y Combinator companies (the newest batch here is Summer 2021, with 11).
Other years
All years (291) 2026 (110) 2025 (93) 2024 (26)
Aerospace and defense startups in 2021
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| Buoyant Aero | Bringing back blimps | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Epsilon3 | AI-Powered ERP, MES, and Test Software for Complex Operations | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Heo Robotics | We visually monitor space objects for governments and defense | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Instacrops | Helping farmers maximize crop yield | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Inversion Space | Turning space into a transportation layer for Earth | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Kalam Labs | Autonomous Stratospheric UAVs | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Malloc Inc | AI-driven mobile cybersecurity | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Odys Aviation | Vertical takeoff and landing aircraft for major airlines | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Onebrief | Onebrief makes military headquarters run seamlessly | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| TransAstra Corporation | Orbital logistics: Unleashing space industry, from Earth to asteroids | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Turion Space | Moving Things Around in Space, Imaging Space Objects When We're Not | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Alba Orbital | We make satellites to image everywhere on Earth, every 15 minutes | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Albedo | Full-stack VLEO satellite missions | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Care Weather | The highest-accuracy global weather data from low-cost flat satellites | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| H3X Technologies | The lightest electric aircraft motors in the world. | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Hermes Robotics | Autonomous street sweeping as a service by retro-fitting vehicles | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Regent | All-electric seagliders for fast, affordable regional transportation | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Stoke Space | Seamless mobility to, through, and from space | Winter 2021 | Y Combinator batch | Y Combinator listing |
Selling to these companies?
Export the list: a spreadsheet of the 18 Aerospace and defense companies in the table below, with each one's date, amount, round or stage, the record it comes from and its MentionFox page. Free with an account; if you are not signed in, you sign up first and the download starts when you come back to this page.
Export the listA Full Report covers who runs the company, who owns it, where its money comes from and what to watch for, every claim linked to its source. See pricing.
Related startup lists
AI (50 shared) Hardware and semiconductor (35 shared) Manufacturing and industrial (22 shared) Energy (18 shared) Robotics (18 shared) Climate tech (13 shared)
Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.