Valued at $2.8B at its early-stage round, Dec 2025. Nothing has traded since.
- ·Every dated print: 2 trades with prices and structures
- ·1 investment vehicle formed around Castelion: sponsors, sizes, dates
Membership and data by Private Market View
Valuation timeline
0 priced rounds · 32 daily marks since · Sep 2026 – Oct 2026Membership and data by Private Market View
Castelion funding history
3 rounds| Date | Round | Raised | Post-money | $/share |
|---|---|---|---|---|
| Aug 2025 | Later Stage VC | $360.0M | ▮ | ▮ |
| Nov 2024 | Later Stage VC | $60.0M | ▮ | ▮ |
| Sep 2023 | Early Stage VC | $8.6M | ▮ | ▮ |
Membership and data by Private Market View
Castelion valuation
Castelion was valued at $2.8 billion at its early-stage round in Dec 2025. That is the last priced event on record: no secondary trade or institutional fund mark has moved the figure since.
How much has Castelion raised?
Castelion has raised $464 million across 3 recorded rounds since 2023. The largest was an $8.6 million early-stage round in Sep 2023; the most recent was a $360 million later-stage round in Aug 2025.
Castelion has filed 3 Form Ds with the SEC since 2023, most recently in Nov 2025 ($60 million sold to 8 investors).
Castelion secondary market activity
2 secondary trades in Castelion shares are on record, between Dec 2025 and Apr 2026. Exact dates, prices and structures are available to Pro members.
Institutional holders and vehicles
In the last 12 months, 1 investment vehicle was formed to buy Castelion shares, reporting $2 million sold to 23 investors, per SEC Form D filings (most recent Oct 2025).
How Castelion's valuation is determined
Private company valuations aren’t quoted on an exchange — they’re established in moments: a priced funding round sets a post-money valuation, secondary trades print at a price per share, and SEC-registered funds holding the stock report fair-value marks in their N-PORT filings.
For Castelion, the most current credible signal sets the number and the older ones confirm it: a live secondary-market price first, then three or more recent prints, then institutional fund marks, and otherwise the last priced round, which never decays. The valuation is the last round’s post-money moved by the price change since that round, so no share count is assumed. Today it is set by its last priced round. Question about this number? Full methodology →
Frequently asked about Castelion
- What is Castelion worth?
- Castelion is valued at $2.8B as of Oct 2026. Valued at $2.8B at its early-stage round, Dec 2025. Nothing has traded since.
- How much has Castelion raised?
- Castelion has raised $464.1M in total funding across 3 recorded rounds.
- When did Castelion last raise?
- Castelion last raised in Aug 2025 (Later Stage VC), raising $360.0M.