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Silmaril

YC X26

San 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.

CybersecurityEnterprise SoftwareUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (X26)

Silmaril was founded in 2026 by Aum Upadhyay and Eduardo Velasco.

AUAum Upadhyay
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.
EVEduardo Velasco
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.