Sublime Security Valuation, Funding & Investors

Sublime Security is valued at $926M as of October 2025.

Last Sublime Security valuation

$926M

Series C · Oct 2025

Last Sublime Security funding round

$150M

Series C · Oct 2025

Cumulative funding Sublime Security raised

$240M

across 4 funding rounds

Key investors in Sublime Security

  • Slow Ventures
  • Index Ventures
  • Decibel Partners
  • IVP
  • Citi Ventures
  • Georgian

Sublime Security Overview

About Sublime Security

Sublime Security is an AI-powered cloud email security platform offering adaptive threat detection with full visibility and administrative control. Its open architecture supports custom detections, threat hunting, SIEM/SOAR integrations, and team collaborations for enterprise security operations.


Founded

2019

HQ

United StatesWashington, DC

Status

Privately held

Customer focus

B2B

Revenue model

Subscription

Valuation

$926M (Oct 2025)

Sublime Security Valuation

Sublime Security is currently valued at $926M, based on its Series C in October 2025.

The $150M round was led by Georgian, with participation from Index Ventures, IVP, Slow Ventures, Jonathan Oberheide, Silver Buckshot Ventures and 4 other investors.

Sublime Security valuation by funding round

Sublime Security valuation by funding round
DateStageValuation
Oct 2025Series C$926M

Sublime Security Funding History

Sublime Security has raised a total of $240M across 4 funding rounds.

Sublime Security's first fundraising round was a $10M seed round in February 2023. The most recent completed round was a $150M Series C in October 2025.

Sublime Security funding rounds

Sublime Security funding rounds
DateStageInvestorsRaisedValuationDeal Summary
Oct 2025Series CGeorgian (lead); Index Ventures; IVP; Slow Ventures; Jonathan Oberheide; Silver Buckshot Ventures; Nicole Perlroth; Avenir; 01 Advisors; Citi Ventures$150M$926MSublime Security is a Washington, D.C.-based cybersecurity company developing an agentic AI platform for autonomous email defense, designed to detect, triage, and adapt to sophisticated AI-powered threats with transparency and control for security teams. The platform includes innovations like the Autonomous Security Analyst (ASA) for rapid threat investigation and the Autonomous Detection Engineer (ADÉ) for creating tailored defenses. Customers include enterprise leaders such as Spotify, Snowflake, Zscaler, Anduril, Centrica, Benteler, British Gas, Elastic, SentinelOne, and Compass, with 100% customer retention since inception. In October 2025, Sublime Security raised $150 million in a Series C round led by Georgian, with participation from new investors Avenir, 01 Advisors (01A), Jonathan Oberheide, and Nicole Perlroth, alongside existing backers Index Ventures, IVP, Citi Ventures, Slow Ventures, and Silver Buckshot Ventures. Sacra reports a post-money valuation of approximately $926 million for this round, bringing total disclosed funding to $243.8 million across prior rounds: $60 million Series B in December 2024 led by IVP, $20 million Series A in April 2024 led by Index Ventures, and $9.8 million seed in February 2023. One source incorrectly lists a $1B valuation and mismatched investors. The funds will accelerate agentic AI capabilities, enhance the autonomous email defense platform, expand global presence, drive product innovation against next-generation threats, and support scaling operations in the competitive post-LLM cybersecurity landscape. The company reported 100% growth in annual recurring revenue in the first half of 2025, reflecting strong momentum amid rising AI-driven attacks, positioning Sublime to challenge legacy email security solutions with programmable, proactive defenses.
Dec 2024Series BIVP (lead); Index Ventures; Slow Ventures; Decibel Partners; Citi Ventures$60M-Sublime Security is an adaptive, AI-powered email security platform based in Washington, D.C., designed to protect organizations from advanced email-borne attacks by leveraging an AI detection engine that adapts quickly to evolving threats, offering comprehensive coverage, visibility, and control without the limitations of traditional black-box solutions. The platform aims to transform email security similar to how CrowdStrike revolutionized endpoint security, addressing challenges posed by GenAI in both attacks and defenses. On December 12, 2024, Sublime Security raised $60 million in a Series B funding round led by IVP, with participation from new investor Citi Ventures and existing investors Index Ventures, Decibel Partners, and Slow Ventures, bringing total funding to $93.8 million. This followed a $20 million Series A in April 2024 led by Index Ventures and earlier seed funding. The funds are intended to support continued investment in the platform, community growth, operations expansion, and development of advanced features amid strong product innovation and customer momentum. Since the prior Series A seven months earlier, Sublime quadrupled its customer base, adding enterprises like Elastic, Benteler, and Cribl, alongside clients such as Spotify, Reddit, and Brex. The company offers a self-hosted Core Platform for free at any scale and the first 100 inboxes free in its SaaS environment, emphasizing accessibility and scalability. Colin Jones, former Wiz Chief Revenue Officer, joined as President to lead go-to-market efforts. A subsequent $150 million Series C in October 2025, led by Georgian with participation from Avenir, 01A, Index Ventures, IVP, Citi Ventures, Slow Ventures, and Decibel Partners, achieved a post-money valuation of approximately $926 million, raising total funding to $243.8 million.
Apr 2024Series AIndex Ventures (lead); Dmitri Alperovitch; Slow Ventures; Decibel Partners$20M-Sublime Security is an AI-native email security platform founded in 2019, headquartered in Washington, DC, that deploys specialized AI agents to protect against phishing and advanced email-based attacks powered by generative AI. Its Autonomous Security Analyst (ASA) triages threats in seconds, and Autonomous Detection Engineer (ADÉ) deploys tailored defenses rapidly, reducing manual work for security teams. Customers include enterprises like Spotify, Anduril, ASOS, and Elastic, with zero enterprise churn since inception and 4x customer base growth in 2025. The queried Series A round in April 2024 raised $20M led by Index Ventures, with participation from Decibel Partners and Slow Ventures, matching the specified investors. This followed a $9.8M seed in February 2023 led by Decibel Partners and Slow Ventures. Subsequent rounds include a $60M Series B in December 2024 led by IVP with Citi Ventures, Index Ventures, Decibel Partners, and Slow Ventures, bringing total funding to $93.8M
Feb 2023SeedDecibel Partners (lead); Slavik Markovich; Oliver Friedrichs; Slow Ventures; Martin Roesch; Runtime Ventures; Jerry Perullo; Kevin Mahaffey; Rishi Bhargava$10M-Sublime Security is an AI-powered email security platform founded by Josh Kamdjou and publicly launched in February 2023. The company uses agentic AI to detect, triage, and adapt to email-borne threats in real-time, featuring specialized agents like the Autonomous Security Analyst (ASA) and Autonomous Detection Engineer (ADÉ). By December 2024, Sublime had quadrupled its customer base since its Series A funding and maintained zero enterprise customer churn, serving major clients including Spotify, Reddit, Brex, Snowflake, and SentinelOne. The company raised $150 million in Series C funding in October 2025 at a $926 million post-money valuation, led by Georgian with participation from Avenir, 01A, Index Ventures, IVP, Citi Ventures, Slow Ventures, and Decibel Partners. Total disclosed funding reached $243.8 million across all rounds, with proceeds directed toward advancing agentic AI capabilities, expanding global presence, and accelerating product innovation to counter next-generation threats.

Who has invested in Sublime Security?

19 investors have backed Sublime Security across its funding rounds, including Slow Ventures, Index Ventures, Decibel Partners, IVP, Citi Ventures and Georgian.

Lead investors include Georgian, IVP, Index Ventures and Decibel Partners.


Sublime Security Investors

Investors in Sublime Security by funding rounds participated
InvestorHQRoundsRoleFirst check
Slow VenturesUnited StatesSan Francisco, CA4ParticipantFeb 2023
Index VenturesUnited KingdomLondon3LeadApr 2024
Decibel PartnersUnited StatesSan Francisco, CA3LeadFeb 2023
IVPUnited StatesSan Francisco, CA2LeadDec 2024
Citi VenturesUnited StatesSan Francisco, CA2ParticipantDec 2024
Slavik MarkovichUnited StatesSan Francisco, CA1ParticipantFeb 2023
Dmitri AlperovitchUnited StatesWashington, DC1ParticipantApr 2024
Oliver FriedrichsUnited StatesSan Francisco, CA1ParticipantFeb 2023
GeorgianCanadaToronto1LeadOct 2025
Martin RoeschUnited StatesBaltimore, MD1ParticipantFeb 2023
Jonathan OberheideUnited StatesAnn Arbor, MI1ParticipantOct 2025
Runtime VenturesUnited StatesWashington, DC1ParticipantFeb 2023
Silver Buckshot Ventures--1ParticipantOct 2025

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Sublime Security Competitors

Sublime Security competitors include listed companies like NSFOCUS and Rapid7, and private ones like Qingteng Cloud Security, Cape, Corelight and SecurityScorecard.

Public and private companies comparable to Sublime Security
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
Qingteng Cloud SecurityChinaBeijingPrivate--$938M-
CapeUnited StatesWashington, DCPrivate--$900M-
CorelightUnited StatesSan Francisco, CAPrivate--$900M-
SecurityScorecardUnited StatesNew York City, NYPrivate--$900M-
NSFOCUSChinaChinaPublicly listed$379M$37M$955M2.4x
Rapid7United StatesUnited StatesPublicly listed$860M$63M$836M1.3x

Sublime Security Public Comps

Sublime Security is still privately-owned, but its public comps include BeiJing Certificate, NSFOCUS, Yubico, Rapid7, Riskified, Asiainfo Security, Mitek Systems, CANCOM, Feitian Technologies and Eastcompeace Tech.

Last FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
BeiJing Certificate$125M($12M)6.7x-(70.9x)-
NSFOCUS$379M$37M2.6x2.4x26.1x25.6x
Yubico$226M$19M3.3x3.2x39.7x25.6x
Rapid7$860M$63M1.3x1.3x17.4x6.8x
Riskified$345M($31M)1.8x1.6x(20.3x)19.0x
Asiainfo Security$1.2B($11M)1.2x1.1x(126.2x)339.7x
Mitek Systems$180M$37M4.1x3.7x19.9x11.2x
CANCOM$2B$118M0.4x0.4x6.3x5.7x

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Common questions about Sublime Security

When was Sublime Security founded?Sublime Security was founded in 2019.
Where is Sublime Security headquartered?Sublime Security is headquartered in Washington, DC, United States.
Is Sublime Security publicly listed?No, Sublime Security is a private, VC-backed company.
What is Sublime Security's valuation?Sublime Security was last valued at $926M in its Series C in October 2025.
How much funding has Sublime Security raised?Sublime Security has raised $240M across 4 funding rounds.
What was Sublime Security's last funding round?Sublime Security's last funding round was a $150M Series C in October 2025, led by Georgian.
Who are Sublime Security's investors?Sublime Security's investors include Slow Ventures, Index Ventures, Decibel Partners, IVP, Citi Ventures, Slavik Markovich, Dmitri Alperovitch, Oliver Friedrichs, Georgian, Martin Roesch and 9 others.
Which companies are comparable to Sublime Security?Companies comparable to Sublime Security include Qingteng Cloud Security, Cape, Corelight, SecurityScorecard, NSFOCUS and Rapid7.

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