Castelion stock $126.42 USD
Private-market facts for current and former Castelion employees researching their stock.
Price per share sourced from public secondary-market data. Updated April 2026. Indicative only — not a live quote.
Overview
Castelion is a defense technology company focused on developing and manufacturing advanced guided munitions and autonomous weapon systems at high production rates for the U.S. military.
Selling Castelion shares
Why shareholders consider selling
Shareholders in Castelion may explore liquidity for a number of reasons — diversifying a concentrated position, funding a personal financial goal, or simply reducing exposure to a single private holding. As a private company, Castelion does not trade on a public exchange, meaning employees and early shareholders cannot simply sell through a brokerage. Extended private timelines can leave shareholders waiting years for an exit event, which is why some choose to explore secondary-market options.
Can you sell Castelion stock?
Whether a shareholder can sell typically depends on what they hold and how it was acquired. Vested and exercised shares are generally more straightforward than unexercised options or unvested RSUs. Most private companies, including those in the Aerospace & Defense sector, impose transfer restrictions such as rights of first refusal or board approval requirements. The specific terms governing Castelion shares would be outlined in the holder's equity agreement or the company's governing documents.
What affects the value of Castelion shares?
The price a buyer is willing to pay for private shares is shaped by several factors: overall demand for the stock, the company's financial performance, broader Aerospace & Defense market conditions, and any recent private-market transaction activity. Data points such as the company's Series B round, its reported $1.6B valuation and recent secondary-market pricing can help frame expectations, though they do not guarantee a transaction price.
What should holders check before selling
- The type of security held (common shares, preferred, options, RSUs)
- Whether the equity is fully vested and, for options, whether it has been exercised
- Any transfer restrictions, lock-up provisions, or company approval requirements
- Estimated net proceeds after applicable taxes and transaction fees
- Whether partial liquidity — selling a portion rather than the full position — may be a better fit
Tools for Castelion shareholders
Exploring equity in Castelion often raises questions about taxes, exercise timing, valuation, and exit outcomes. These tools can help you model different decisions using your own assumptions.
Latest funding round
Castelion most recently raised a Series B round in June 2024. The company was valued at $1.6B. Total funding raised to date is approximately $200M.
Founders & company background
Castelion was founded in 2021 by Bryon Hargis and is headquartered in El Segundo, CA.
Industry
Similar private companies
Latest Castelion news
Frequently asked questions
- Is Castelion still a private company?
- Yes, Castelion is currently a private company.
- What is Castelion's latest funding round?
- Castelion's most recent known round is Series B, raised in June 2024.
- What is Castelion's valuation?
- Castelion's latest reported valuation is $1.6B.
- Who are the investors in Castelion?
- Investor information is not currently available.
- Can I sell my Castelion stock?
- Private company shares can sometimes be sold on secondary markets. Speaking with a specialist who understands Castelion stock can help you evaluate your options.
Related pages
Last verified: 2026-04-13 · Castelion data compiled from funding disclosures, corporate filings, and public records.
Information on this page is compiled from publicly available sources and may be outdated or incomplete. This is not investment advice. Consult a qualified advisor before making financial decisions.