Halcyon is a privately held company. It is backed by 8 investors on record, including Evolution Equity Partners and Bain Capital Ventures.

Where is Halcyon headquartered?

Halcyon is headquartered in Austin, United States.

Who is the CEO of Halcyon?

Jon Miller is the CEO of Halcyon.

Jon Miller and Ryan Smith are co-founders of Halcyon, founded in 2021.

What products does Halcyon sell?

Halcyon sells Halcyon Anti-Ransomware, Halcyon Anti-Ransomware Platform, and Halcyon Ransomware Detection & Recovery.

Halcyon

Endpoint SecurityAustin, United Statesfounded 2021privatehalcyon.ai ↗

Halcyon is a cybersecurity company specializing in Endpoint Security, founded in 2021 and headquartered in Austin, United States. It has raised $184M in equity across 3 priced rounds, plus $6M debt & credit, employs about 438 people, and is privately held.

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updated Oct 26, 2026

Latest Halcyon news and company activity

What Halcyon did, dated — selected moves from the record, one per kind, newest first.

Oct 2026Product launchHalcyon Launches Double Extortion Prevention to Stop Ransomware Data Theft Before It Creates Leverage
Jul 2026Feature launchHalcyon Launches File Resilience (FiRe), Preventing Ransomware Encryption Before It Starts
Apr 2026Exec changeHalcyon Appoints Dave Hannigan as Field Chief Information Security Officer
Nov 2024Mega round

Halcyon Momentum score

53/ 100

Mandos Momentum blends hiring, funding, traffic and sentiment into one score out of 100. The score is free; the pillars behind it unlock in the platform.

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Halcyon products

Halcyon funding

Halcyon has raised $184M in priced equity, plus $6M debt & credit. Its most recent round was a Series C in November 2024. It has 4 funding rounds on record: Series A, Debt Financing, Series B, and Series C. 8 investors are on record, including Evolution Equity Partners and Bain Capital Ventures.

Equity raised: $184M3 priced rounds
Last round: Series CNov 2024
Other instruments: $6M debt

View the complete funding history

Halcyon employees and hiring

As of September 2026, Halcyon has about 438 employees, down 2% over the last 30 days, with 9 open roles.

Employees: 438
30-day change: -2%
Open roles: 9

See hiring trends

Halcyon competitors

Competitors of Halcyon include CrowdStrike and Microsoft. The full competitive set, with overlap scoring, is in the platform.

ranked by CybersecTools comparison demand, 90 days

View the competitive set with overlap scores

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The other 440 data points.

Funding historyevery round, every investor named
Headcount growthvelocity, departments, seniority
Open jobs9 live postings, role mix
Tech stackframeworks, clouds, security
Competitorsfull set, overlap scored
Leadershipevery exec, with roles
Customersnamed publicly, with sources
Reviews & newssentiment, coverage, cadence

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Funding, round by round, with the investors
Headcount, hiring and the people
The timeline of what they did, dated
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The other 440 data points.

Funding historyevery round, every investor named
Headcount growthvelocity, departments, seniority
Open jobs9 live postings, role mix
Tech stackframeworks, clouds, security

Similar in Endpoint Security

Common questions about Halcyon.

How much funding has Halcyon raised?: Halcyon has raised $184M in priced equity, plus $6M debt & credit. Its most recent round was a Series C in November 2024. It has 4 funding rounds on record: Series A, Debt Financing, Series B, and Series C. 8 investors are on record, including Evolution Equity Partners and Bain Capital Ventures.
How many people work at Halcyon?: As of September 2026, Halcyon has about 438 employees, down 2% over the last 30 days, with 9 open roles.
Who owns Halcyon?: Halcyon is a privately held company. It is backed by 8 investors on record, including Evolution Equity Partners and Bain Capital Ventures.
Where is Halcyon headquartered?: Halcyon is headquartered in Austin, United States.
Who is the CEO of Halcyon?: Jon Miller is the CEO of Halcyon.
Who founded Halcyon?: Jon Miller and Ryan Smith are co-founders of Halcyon, founded in 2021.
Who are Halcyon's competitors?: Competitors of Halcyon include CrowdStrike and Microsoft. The full competitive set, with overlap scoring, is in the platform.
What does Halcyon do?: Halcyon is a cybersecurity company specializing in Endpoint Security, founded in 2021 and headquartered in Austin, United States.