# Halcyon

> Halcyon is a VC fund in Austin backing Software and Productivity Tools. See 1 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: Austin, United States
- Total investments: 1
- Last investment: Jan 2026
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/halcyonai
- X (Twitter): https://twitter.com/HalcyonAi
- Website: http://www.halcyon.ai

Halcyon is a VC fund in Austin focused on Software and Productivity Tools. OUR MISSION: DEFEAT RANSOMWAREModern defensive cyber solutions, while impressive, have failed in the face of cheap and easy-to-create – and most importantly lucrative – ransomware. High-profile breaches are disguising an ugly fact; the companies using next-generation NGAV and EPP solutions continue to be impacted by ransomware Halcyon has builtthe first anti-ransomware engine to tackle this problem. Our team has spent decades building name-brand security products and delivering security consulting to much of the Fortune 500.Split between San Diego, CA and Austin, TX, Halcyon was formed in 2021 by a team of cyber industry veterans after battling the scourge of ransomware (and advanced threats) for years at some of the largest security global security vendors. Comprised of leaders from Cylance (now Blackberry), Accuvant (now Optiv), and ISS X-Force (now IBM), Halcyon is focused on building products and solutions for mid-market and enterprise customers.For more info, please contact: press@halcyon.ai

## Contacts

5 contacts available for Halcyon. Shizune tracks 5 team members at Halcyon. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/halcyon-d8cf?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 1 | 100% |
| Productivity Tools | 1 | 100% |
| Information Technology | 1 | 100% |
| Artificial Intelligence | 1 | 100% |

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Jeffrey C. Williams | Chief Revenue Officer | 5 | — |
| Jon Miller | CEO and Founder | 0 | — |
| Paul Sabanal | Senior Researcher | 0 | — |
| Ryan Golden | CMO | 0 | — |
| Ryan Smith | CTO + Co-Founder | 0 | — |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Theorem | Theorem is an AI based Software Development firm offering productivity and verification tools for development. | $6M | Seed | Jan 27, 2026 |  |

1 of 1 investments shown.

## Co-investors
- [Khosla Ventures](https://shizune.co/investors/profile/khosla-ventures) — VC Fund, 1 deal together
- [Safe AI Fund](https://shizune.co/investors/profile/safe-ai-fund) — VC Fund, 1 deal together
- [E14 Fund](https://shizune.co/investors/profile/the-e14-fund) — VC Fund, 1 deal together
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 1 deal together

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does Halcyon invest in?

Halcyon invests primarily in Software, Productivity Tools and Information Technology startups, most often at Seed stage. Most of the 1 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Halcyon?

Public channels for Halcyon include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### Who are the partners at Halcyon?

The team at Halcyon includes Jeffrey C. Williams (Chief Revenue Officer), Jon Miller (CEO and Founder) and Paul Sabanal (Senior Researcher). The Team section lists each member with their title, investment count and links.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

# About Shizune
Shizune.co is an investor database. Core features:
- 48,091 startup investors (angels, VCs, accelerators, and others)
- Email, phone, LinkedIn (for intros), socials, and other contact data
- Updated daily from public funding news
- CSV and Excel export

The User can access the full database FOR FREE after signing up: shizune.co