Halcyon
VC Fund
Austin, United States
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
- Total investments:
- 1
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Halcyon invests in
Stages Halcyon invests in
Countries Halcyon invests in
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Jeffrey C. Williams
|
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Jon Miller
|
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Paul Sabanal
|
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Ryan Golden
|
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Ryan Smith
|
Investment Focus
Industry
- Software 1 (100%)
- Productivity Tools 1 (100%)
- Information Technology 1 (100%)
- Artificial Intelligence 1 (100%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
|
Jeffrey C. Williams
Chief Revenue Officer
|
Chief Revenue Officer | Total investments: 5 | Find email | |
|
Jon Miller
CEO and Founder
|
CEO and Founder | Total investments: 0 | Find email | |
|
Paul Sabanal
Senior Researcher
|
Senior Researcher | Total investments: 0 | Find email | |
|
Ryan Golden
CMO
|
CMO | Total investments: 0 | Find email | |
|
Ryan Smith
CTO + Co-Founder
|
CTO + Co-Founder | Total investments: 0 | Find email |
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Theorem
|
Theorem is an AI based Software Development firm offering productivity and verification tools for development. | $6M / Seed / Jan 27, 2026 |
Co-Investors
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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.
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