Reactor
PrivateLast Round
Series A
Oct 5, 2026
Total Funding Raised
$74M
Momentum
Top 1%
of companies Caplight tracks
Company Overview
Reactor operates in AI, Data & Cloud Infrastructure and is based in San Francisco, California. Its latest recorded funding round was a Series A round in October 2026.
Reactor is a developer platform company that provides infrastructure for real-time generative video and interactive AI world models.
Sector
AI, Data & Cloud Infrastructure
Verticals
Data Integration, Workflow Automation, Cloud Infrastructure, DevOps & Containers
Business Model
B2B
Customer Profile
Usage-Based SaaS
AI Layer
Infrastructure
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Reactor Comparables
Compare Reactor with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Mage Technologies | 86% | |
| Union.ai | 85% | |
| Orchestra | 85% |
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Reactor Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series A | Oct 5, 2026 | ||||
| Seed | Nov 1, 2025 |
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Key People
Founding team and executive leadership
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Reactor Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| NVentures | Series A |
| Sky9 Capital | Seed, Series A |
| Sky9 Capital | Series A |
| Sapphire Ventures | Series A |
| WndrCo | Seed, Series A |
| Amplify Partners | Seed, Series A |
| Yoonji Capital | Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Oct 8, 2026
Partnering with NVIDIA to run and optimize world models.
- Oct 8, 2026
Partnering with Amazon to optimize world models.
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Recent news
Latest coverage and updates
- partners_withSep 7, 2026
On Sep 7th '26, Reactor and NVIDIA Corporation partner to launch Sol-H3, powered by Sol-Engine, giving users day-one access to 5 seconds of 1344x768 video with native audio generated in 1.67 seconds on Blackwell.
- partners_withAug 10, 2026
Reactor and LTX partner to bring LTX's newest open world video model—realtime, high-resolution, and with native synchronized audio—to Reactor on day zero, announced on Aug 10th '26.
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Reactor 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 Reactor's valuation, stock price, and market status.
Is Reactor a public or private company?
Reactor is a private company.
What is the current stock price of Reactor?
Reactor is a private company, so its shares have no public market price. Caplight tracks Reactor's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Reactor worth (valuation)?
Valuation information for Reactor is not publicly available.
Can I buy Reactor stock?
Reactor shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Reactor's last funding round?
Reactor's most recent funding round was Series A on October 5, 2026.
Who are the main investors in Reactor?
Key investors in Reactor include Lightspeed Venture Partners.
Will Reactor IPO soon?
No public IPO plans have been announced for Reactor.
How can I track Reactor secondary market activity?
Caplight tracks bids, offers, and trades in Reactor's shares on secondary markets.