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Silmaril

Pre-Seed
silmaril.devB2BSan Francisco, CA, USA
Market index

Market data is refreshed once per day from public sources. Information may be incomplete or outdated — verify independently before making decisions. This is not investment advice.

Beta

DealFlow OS uses public web data and automated enrichment. Research may be incomplete, outdated, or incorrect. Verify important information before making investment or outreach decisions.

Investor read

Evidence-bound summary — expand sections for movement, risks, and signals.

Memo snapshot · May 20, 2026, 6:15 PM

Beta

DealFlow OS uses public web data and automated enrichment. Research may be incomplete, outdated, or incorrect. Verify important information before making investment or outreach decisions.

What they do

Silmaril | Prompt Injection Defense Self-healing prompt injection defense for agents.

Funding

Raised $500K across 1 funding round. Latest: $500K Pre-seed (Jan 2026). Investors: Y Combinator. (High).

Quick read

  • •Silmaril | Prompt Injection Defense Self-healing prompt injection defense for agents.
  • •Reported angle: silmaril on PyPI
  • •Indexed activity snapshot: 1 funding‑related row(s), 0 hiring‑related, 0 GitHub‑tagged, 1 product/news‑style — scoring reflects corpus coverage only.

Stage

Seed (YC)

Evidence summary

Verified facts

  • •Silmaril | Prompt Injection Defense Self-healing prompt injection defense for agents.
  • •Reported angle: silmaril on PyPI
  • •Indexed activity snapshot: 1 funding‑related row(s), 0 hiring‑related, 0 GitHub‑tagged, 1 product/news‑style — scoring reflects corpus coverage only.

Recent movers

  • •May 20, 2026 · ycombinator.com — Silmaril | Y Combinator
  • •May 20, 2026 · pypi.org — silmaril on PyPI
  • •May 20, 2026 · ycombinator.com — Silmaril | Y Combinator
  • •May 20, 2026 · pypi.org — silmaril on PyPI
  • •Y Combinator

Funding

Raised $500K across 1 funding round. Latest: $500K Pre-seed (Jan 2026). Investors: Y Combinator. (High).

Hiring

No hiring/careers evidence indexed (Low).

GitHub

No GitHub‑linked evidence indexed (Low).

Product / news

1 product/news‑styled row(s); headline risk without filings (High).

Traffic / social

No traffic/social evidence indexed (Low).

Funding & hiring signals

funding_articleMay 20, 2026Confidence: high

Silmaril | Y Combinator

Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.

Affected score: yesObserved: May 20, 2026Round: Pre-Seed
raisedpre-seed

Open roles (indexed)

No open roles indexed yet.

Failed or blocked links

  • public_market_enrichmentno_relevant_pages
    Last checked Mon, May 11, 06:00 AM

    HTTP 429 (blocked or rate-limited)

  • public_page:homeblocked
    Last checked Mon, May 11, 06:00 AM

    HTTP 429 (blocked or rate-limited)

  • public_page:customersblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:pricingblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:pressblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:newsblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:blogblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:jobsblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:careersblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:teamblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

  • public_page:aboutblocked
    Last checked Sun, May 10, 10:46 PM

    HTTP 429 (blocked or rate-limited)

DealFlow growth score
42.0Limited recent public signal
7D+0%
30D+0%
Needs Review

The score is an algorithmic estimate based on observed public company-level signals. It may be incomplete, stale, or inaccurate and is not investment, legal, tax, or business advice.

DealFlow score momentum

427D +030D +0
100500
2026-05-20: 42

More runs will build history.

The score is an algorithmic estimate based on observed public company-level signals. It may be incomplete, stale, or inaccurate and is not investment, legal, tax, or business advice.

Signal breakdown

Latest momentum signal per category. Expand a card to inspect raw payloads.

Public source summary

Total evidence rows
3
Latest evidence
Wed, May 20, 06:15 PM

Source types found

company_sitefunding_articlepress

Strongest / recent news-style rows

  • Silmaril | Y Combinator

    Wed, May 20, 06:15 PM · confidence 88%high quality

    https://www.ycombinator.com/companies/silmaril

  • silmaril on PyPI

    Wed, May 20, 06:15 PM · confidence 85%medium quality

    https://pypi.org/project/silmaril/

Public signal timeline

Newest first · 3 event(s)

1
Wed, May 20, 06:15 PM · funding_article · 88% · verified_publichigh quality

Silmaril | Y Combinator

Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.

Source ↗
2
Wed, May 20, 06:15 PM · company_site · 85% · verified_publichigh quality

Silmaril | Prompt Injection Defense

Self-healing prompt injection defense for agents.

Source ↗
3
Wed, May 20, 06:15 PM · press · 85% · verified_publicmedium quality

silmaril on PyPI

Public Python package for Silmaril integration.

Source ↗

Official / company site

1 row(s)

company_site·Wed, May 20, 06:15 PM·Confidence 85%high qualityverified_public

Silmaril | Prompt Injection Defense

Self-healing prompt injection defense for agents.

https://silmaril.dev/

News

1 row(s)

press·Wed, May 20, 06:15 PM·Confidence 85%medium qualityverified_public

silmaril on PyPI

Public Python package for Silmaril integration.

https://pypi.org/project/silmaril/

Funding / news

1 row(s)

funding_article·Wed, May 20, 06:15 PM·Confidence 88%high qualityverified_public

Silmaril | Y Combinator

Spring 2026 (P26) batch; self-healing prompt-injection defense for AI apps.

https://www.ycombinator.com/companies/silmaril

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