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Evidence-bound summary — expand sections for movement, risks, and signals.
Memo snapshot · May 20, 2026, 6:15 PM
What would change this read
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TL;DR
Seed (YC)Silmaril | Prompt Injection Defense Self-healing prompt injection defense for agents.
Raised $500K across 1 funding round. Latest: $500K Pre-seed (Jan 2026). Investors: Y Combinator. (High).
Funding
Raised $500K across 1 funding round. Latest: $500K Pre-seed (Jan 2026). Investors: Y Combinator. (High).
Product / news
1 product/news‑styled row(s); headline risk without filings (High).
Verified facts
Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.
Weak funding evidence: mention does not include a parsed raise amount/round and may refer to non-funding context.
No open roles indexed yet.
The index price and activity score are algorithmic estimates based on observed public company-level signals. They may be incomplete, stale, or inaccurate and are not investment, legal, tax, or business advice.
Source types found
Strongest / recent news-style rows
Wed, May 20, 06:15 PM · confidence 88%high quality
wikipedia · Mon, Jun 29, 03:23 PM · confidence 50%medium quality
wikipedia · Mon, Jun 29, 03:23 PM · confidence 50%medium quality
Newest first · 12 event(s)
Source: Homepage
A firewall for AI applications, trained continuously against real attacks discovered in your environment. Supports all major agentic SDKs. Five lines to integrate.
Source: official_site
Silmaril | Runtime Security for AI SILMARIL Problem Solution Approach Performance Threats Blocked FAQ Docs Book a Demo SILMARIL Book a Demo Silmaril The first runtime security for AI that self-improves June Briefing Book a Demo Backed by Y Combinator SILMARIL…
Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.
Self-healing prompt injection defense for agents.
Source: npm_registry
TypeScript SDK for Silmaril Firewall — prompt injection and jailbreak detection
Source: npm_registry
A React component library for building security-focused dashboard interfaces. Built with Tailwind CSS v4, Radix UI primitives, and Recharts.
Source: npm_registry
Compile-time reactivity for JS
Source: npm_registry
Compile-time reactivity for JS
Public Python package for Silmaril integration.
3 row(s)
The company's own site — the authoritative description of what they sell and to whom. Marketing-controlled, so treat claims as positioning rather than verified traction.
A firewall for AI applications, trained continuously against real attacks discovered in your environment. Supports all major agentic SDKs. Five lines to integrate.
Why it matters: Primary source — the company's own positioning; best read for what they sell and to whom, not for traction claims.
Open source ↗Silmaril | Runtime Security for AI SILMARIL Problem Solution Approach Performance Threats Blocked FAQ Docs Book a Demo SILMARIL Book a Demo Silmaril The first runtime security for AI that self-improves June Briefing Book a Demo Backed by Y Combinator SILMARIL…
Why it matters: Primary source — the company's own positioning; best read for what they sell and to whom, not for traction claims.
Open source ↗Self-healing prompt injection defense for agents.
Why it matters: Primary source — the company's own positioning; best read for what they sell and to whom, not for traction claims.
Open source ↗3 row(s)
Third-party press coverage. Independent reporting corroborates company claims; repeated coverage across outlets is a momentum signal.
Why it matters: Independent coverage — third-party corroboration of company claims; recurring coverage indicates rising visibility.
Open source ↗Why it matters: Independent coverage — third-party corroboration of company claims; recurring coverage indicates rising visibility.
Open source ↗Public Python package for Silmaril integration.
Why it matters: Independent coverage — third-party corroboration of company claims; recurring coverage indicates rising visibility.
Open source ↗1 row(s)
Funding announcements and investor-database records. The strongest public signal of capitalization: round, amount, and syndicate quality when disclosed.
Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.
Why it matters: Funding signal — Pre-Seed per this source; verify against the linked original before relying on it.
Open source ↗5 row(s)
Public engineering activity. Sustained commits, releases, and stars indicate real product development and, for dev tools, developer adoption.
Compile-time reactivity for JS
Why it matters: Engineering signal — public repo activity evidences active development and possible developer adoption.
Open source ↗TypeScript SDK for Silmaril Firewall — prompt injection and jailbreak detection
Why it matters: Engineering signal — public repo activity evidences active development and possible developer adoption.
Open source ↗A React component library for building security-focused dashboard interfaces. Built with Tailwind CSS v4, Radix UI primitives, and Recharts.
Why it matters: Engineering signal — public repo activity evidences active development and possible developer adoption.
Open source ↗Compile-time reactivity for JS
Why it matters: Engineering signal — public repo activity evidences active development and possible developer adoption.
Open source ↗Compile-time reactivity for JS
Why it matters: Engineering signal — public repo activity evidences active development and possible developer adoption.
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