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Arcjet
San Francisco, US · Founded 2023 · 15 employees on LinkedIn · 3 known investors
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Arcjet provides inline security controls for AI workflows and agents, enforcing action-boundary protections such as blocking unauthorized tool calls, preventing data exfiltration, and capping token usage. It targets developers building AI-powered applications, offering prompt injection detection, data loss prevention, and agent tool scoping enforced in real time.
Founders & leadership
Arcjet was founded in 2023 by David Mytton.
Investors · 3
How we know: a16z's portfolio · a partner's Signal profile · funding news · fintech.global · Not right? Tell us
How we know: Maximilian Stoiber's portfolio page · Not right? Tell us
How we know: Seedcamp's portfolio page · a partner's Signal profile · funding news · seedcamp.com · the VCSheet dataset · open dataset · 5k.vc investor directory · Not right? Tell us
Funding
SEC filings, press & company announcements$20.3M disclosed across 3 of 6 rounds · 2023–2025
- $8.3MraisedOct 2025 · 2 sourcesSource ↗
- Undisclosed amountSeries AOct 2025Source ↗
- Undisclosed amountseedSep 2024Source ↗
▶$8.5MraisedMay 2025 · 7 investors · Other TechnologyRule 506(b)
- David MyttonExecutive Officer, Director
- Offering amount
- $8.6M
- Amount sold
- $8.5M
- First sale
- Apr 2025
- Incorporated
- Corporation, Delaware, 2023
- Federal exemptions
- 06b
▶$3.5MraisedJun 2023 · 24 investors · Other TechnologyRule 506(b)
- David MyttonExecutive Officer, Director
- Offering amount
- $3.5M
- Amount sold
- $3.5M
- First sale
- Jun 2023
- Incorporated
- Corporation, Delaware, 2023
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Founder mafia
2 people who came through Arcjet went on to found or lead other companies.
In the news
Frequently asked questions
- What does Arcjet do?
- Arcjet provides inline security controls for AI workflows and agents, enforcing action-boundary protections such as blocking unauthorized tool calls, preventing data exfiltration, and capping token usage. It targets developers building AI-powered applications, offering prompt injection detection, data loss prevention, and agent tool scoping enforced in real time.
- Who founded Arcjet?
- Arcjet was founded by David Mytton in 2023.
- Who are Arcjet's investors?
- Arcjet's investors include Andreessen Horowitz, Maximilian Stoiber, Seedcamp.
- How much funding has Arcjet raised?
- Arcjet has disclosed $20.3M raised across 3 of its 6 known rounds.
- Where is Arcjet headquartered?
- Arcjet is headquartered in San Francisco, US.