Silmaril
YC X26San Francisco, US · Founded 2026 · 2 employees · 1 known investors
Silmaril is a security monitoring and threat detection platform that protects enterprise systems by identifying and blocking malicious tool calls and prompt injection attacks.
Founders & leadership· Y Combinator alumni (X26)
Silmaril was founded in 2026 by Aum Upadhyay and Eduardo Velasco.
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Aum Upadhyayin𝕏Co-Founder & CEOAum Upadhyay previously worked on security and privacy frameworks at AWS. He is now co-founder and CEO of Silmaril, where he focuses on prompt injection defense.
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Eduardo Velascoin𝕏FounderEduardo Velasco is a former tech lead at Amazon with expertise in low-latency machine learning systems. He is co-founder and CTO of Silmaril.
Investors · 1
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Frequently asked questions
- What does Silmaril do?
- Silmaril is a security monitoring and threat detection platform that protects enterprise systems by identifying and blocking malicious tool calls and prompt injection attacks.
- Who founded Silmaril?
- Silmaril was founded by Aum Upadhyay, Eduardo Velasco in 2026.
- Who are Silmaril's investors?
- Silmaril's investors include Y Combinator.
- Where is Silmaril headquartered?
- Silmaril is headquartered in San Francisco, US.

