Castelion
PrivateLast Round
Series C
Aug 19, 2026
Est. Valuation
$13B
Total Funding Raised
$1.29B
Momentum
Top 5%
of companies Caplight tracks
Company Overview
Castelion is an aerospace and defense company that designs, tests, and manufactures next-generation hypersonic strike weapons and military systems.
Sector
Frontier & Industrial Tech
Verticals
Defense Tech, Computing Hardware, Space Technology
Business Model
B2G
Customer Profile
Government Contracts, Hardware Sales
AI Layer
Application
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Castelion Comparables
Compare Castelion with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Specter Aerospace | 78% | |
| Hypersonica | 78% | |
| Lockheed Martin Corporation | 75% |
For institutional investors. Book with your work email.
Castelion Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series C | Aug 19, 2026 | ||||
| Series B | Dec 5, 2025 | ||||
| Debt | Jan 29, 2025 | ||||
| Series A | Jan 29, 2025 | ||||
| Seed | Oct 5, 2023 |
For institutional investors. Book with your work email.
Key People
Founding team and executive leadership
For institutional investors. Book with your work email.
Castelion Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Andreessen Horowitz | Series B, Series A, Seed, Series C |
| Interlagos Capital | Series B, Series A, Series C |
| Lavrock Ventures | Series B, Series A, Series C, Seed |
| BlueYard Capital | Seed, Series B, Series A |
| Cantos Ventures | Series B, Series A |
| The Carlyle Group | Series C |
| General Catalyst | Series B, Series C |
For institutional investors. Book with your work email.
Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 21, 2026
Monthly visitors increased 37% MoM.
- Aug 19, 2026
Grew 34% QoQ, from 182 to 243 employees.
For institutional investors. Book with your work email.
Recent news
Latest coverage and updates
- identified_as_competitor_ofOct 31, 2026
Castelion Corporation competes directly with Lockheed Martin Corporation in hypersonic missiles, with its Blackbeard program competing against Lockheed Martin Corporation's Dark Eagle program.
- expands_facilitiesOct 12, 2026
Castelion Corporation breaks ground on its planned 1,000-acre solid rocket motor manufacturing campus in New Mexico in Jan '26, with plans to invest more than $220 million and create over 300 manufacturing jobs.
- hiresOct 6, 2026
Castelion Corporation, a hypersonic missile startup valued at $13 billion, hires Brody Franzen after he serves as deputy chief engineer at Virgin Galactic.
- partners_withSep 14, 2026
Castelion Corporation partners with Air Force to develop Blackbeard with hundreds of millions of dollars in private investment.
- partners_withSep 14, 2026
On Sep 14th '26, Castelion Corporation partners with Army Corp. to develop Blackbeard with hundreds of millions of dollars in private investment, with work performed in New Mexico and California alongside the U.S. Navy and U.S. Air Force.
For institutional investors. Book with your work email.
Castelion Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
Book a demoFor institutional investors. Book with your work email.
Appears On
Curated lists and screens where this company is featured.
Frequently Asked Questions
Common questions about Castelion's valuation, stock price, and market status.
Is Castelion a public or private company?
Castelion is a private company.
What is the current stock price of Castelion?
Castelion is a private company, so its shares have no public market price. Caplight tracks Castelion's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Castelion worth (valuation)?
Castelion's valuation is estimated at $13.0B based on funding round data.
Can I buy Castelion stock?
Castelion shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Castelion's last funding round?
Castelion's most recent funding round was Series C on August 19, 2026.
Who are the main investors in Castelion?
Key investors in Castelion include Andreessen Horowitz, Lavrock Ventures, The Carlyle Group, Silicon Valley Bank, Lightspeed Venture Partners.
Will Castelion IPO soon?
No public IPO plans have been announced for Castelion.
How can I track Castelion secondary market activity?
Caplight tracks bids, offers, and trades in Castelion's shares on secondary markets.