Silmaril
YC X26 · Active · Security for agents that self-improves
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 RunRLShared: self improve, agentActiveAI, Devtools | AI, Devtools | Active | YCX25 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 FreesoloShared: lower latencyActiveAI, Devtools | AI, Devtools | Active | YCX25 |
 RGI LabsShared: self improveActiveAI, Devtools | AI, Devtools | Active | YCS21 |
 Dreamscale LabsShared: lower latencyActiveAI, Devtools | AI, Devtools | Active | YCF26 |
 ClearMixShared: 10x lowerInactiveOther | Other | Inactive | YCS20 |
 ScoutShared: 10x lower, currentActiveOther | Other | Active | YCW22 |
Also from X26 in AI
All of X26| Company | Category | Status |
|---|---|---|
 AbInitio BioThe Intelligence layer for Drug ManufacturingActiveAI | AI | Active |
 Advanced Metal ResearchMachine intelligence for American WeldingActiveAI | AI | Active |
 AgentPhonePhone Numbers for AI AgentsActiveAI | AI | Active |
 AkkariAutonomous Customer OperationsActiveAI | AI | Active |
 AllowanceThe spend control layer for AI agentsActiveAI | AI | Active |
 AmborasAI Native ShopifyActiveAI, Data, Devtools | AI, Data, Devtools | Active |
Founders
- Aum UpadhyayFounder/CEO
- Eduardo VelascoFounder/CTO
About Silmaril
Silmaril is the first security for agents that self-improves. It understands application context to block 2x as many threats as current SOTA defenses with 10x lower latency. Customers plug us into agentic frameworks like LangGraph with 5 lines of code. Silmaril has stopped $28M of damages for customers.
- YC batch
- X26 · Spring 2026
- Status, per YC
- Active
- Category
- AI
- Team size
- 2
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 32m ago
Silmaril: questions
Which YC batch was Silmaril in?
Silmaril was in Y Combinator's Spring 2026 batch (X26).
Is Silmaril still active?
Y Combinator lists Silmaril as active.
Who founded Silmaril?
Silmaril's founders, as listed on its YC page: Aum Upadhyay (Founder/CEO), Eduardo Velasco (Founder/CTO).
Where is Silmaril based?
Silmaril lists San Francisco, CA, USA as its location on YC's directory.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.