Arinna
PrivateLast Round
Seed
Mar 25, 2026
Total Funding Raised
$4.81M
Momentum
Top 10%
of companies Caplight tracks
Company Overview
Arinna operates in Energy & Sustainability and is based in South San Francisco, California. Its latest recorded funding round was a Seed round in March 2026.
Arinna is a renewable energy and aerospace technology company that develops ultra-lightweight, flexible, and high-specific-power solar panel technology based on transition metal dichalcogenides (TMDs).
Sector
Energy & Sustainability
Verticals
Space Technology, Renewable Energy, Advanced Materials
Business Model
B2B
Customer Profile
Hardware Sales
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Arinna Comparables
Compare Arinna with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Virtus Solis Technologies | 61% | |
| Swift Solar | 54% | |
| Space Solar | 53% |
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Arinna Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Seed | Mar 25, 2026 | ||||
| Seed | Jun 1, 2025 | ||||
| Grant | Sep 17, 2024 |
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Key People
Founding team and executive leadership
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Arinna Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Castle Fund | Seed |
| Anorak Ventures | Seed |
| Stanford University | Seed |
| Breakthrough Energy Foundation | Seed, Grant |
| Spacecadet Ventures | Seed |
| Hanover | Seed |
| rpv | Seed |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 21, 2026
Monthly visitors increased 114% MoM.
- May 16, 2026
Grew 71% QoQ from 7 to 12 employees.
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Arinna 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.
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Frequently Asked Questions
Common questions about Arinna's valuation, stock price, and market status.
Is Arinna a public or private company?
Arinna is a private company.
What is the current stock price of Arinna?
Arinna is a private company, so its shares have no public market price. Caplight tracks Arinna's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Arinna worth (valuation)?
Valuation information for Arinna is not publicly available.
Can I buy Arinna stock?
Arinna shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Arinna's last funding round?
Arinna's most recent funding round was Seed on March 25, 2026.
Who are the main investors in Arinna?
Key investors in Arinna include Breakthrough Energy Foundation, Spacecadet Ventures, National Science Foundation.
Will Arinna IPO soon?
No public IPO plans have been announced for Arinna.
How can I track Arinna secondary market activity?
Caplight tracks bids, offers, and trades in Arinna's shares on secondary markets.