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01 · Free data roomBuild, share and track important documents.

Data room analytics Document Analytics Pitch Deck Tracking Secure sharing Permissions NDA & agreements Watermarking Versions Branding

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02 · AI Fundraising CRMRun the work between investor meetings.

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Sales deals Board documents Due diligence Real estate

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Fundraising hub Pre-seed Seed Series A

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Funding/Rounds/Onyx Security · Series B

Series B · Cybersecurity

Onyx Security: Series B

Secure AI control plane for the enterprise.

Published Oct 4, 2026By RoundOS Funding desk

Announced Jul 29, 2026

$113MSeries B

Reported in USD

Financing: equity
Stage group: Series B
Country: United States
Sectors: Cybersecurity · AI · Enterprise software

Investors

Bessemer Venture PartnersRole not disclosed

ConvictionRole not disclosed

CyberstartsRole not disclosed

FirstMarkRole not disclosed

G SquaredRole not disclosed

QuantumLightRole not disclosed

TCVRole not disclosed

Vintage Investment PartnersRole not disclosed

OSOnyx SecurityCompany profile · 2 rounds→

Funding history

Jul 29, 2026Series B · This round$113M

Mar 12, 2026Undisclosed$40M

Sources

businesswire.com

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AI United States Cybersecurity Enterprise software North America Series B

RoundOS

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