What is Sublime Security?
Sublime Security distinguishes itself by offering the first open platform for email security, leveraging advanced machine learning, AI, and crowdsourced cybersecurity insights to combat email-originated attacks. Its unique approach allows for a simple, single-line code installation, enabling security professionals to immediately benefit from community-driven threat intelligence or to develop custom rules for emerging threats. This accessibility and community focus position Sublime Security as a key player in enhancing enterprise-level email defense.
How much funding has Sublime Security raised?
Sublime Security has raised a total of $230M across 3 funding rounds:
Series A
$20M
Series B
$60M
Series C
$150M
Series A (2024): $20M with participation from Index Ventures
Series B (2024): $60M led by Index Ventures and Citi
Series C (2025): $150M supported by Slow, Index Ventures, Citi, and 01a
Key Investors in Sublime Security
Index Ventures
Index Ventures is a venture firm investing in the next generation of entrepreneurs from seed to IPO. They partner with founders with bold dreams that challenge the status quo to build enduring companies. With offices in San Francisco & London, Index Ventures invests in entrepreneurs all over the world. Generational Index-backed companies include Adyen, Datadog, Discord, Figma, Robinhood, and Roblox.
Slow
Slow, founded in 2011 and headquartered in San Francisco, CA, is a venture capital firm. The firm seeks to make minority investments in seed-stage, early-stage, and later-stage companies.
Citi
Citibank NA is a financial services multinational corporation. It offers banking services and financial loans. The company was founded in 1812 and is based in Louisville, Kentucky.
What's next for Sublime Security?
The recent major strategic investment signals a pivotal phase for Sublime Security, likely aimed at accelerating product development, expanding market reach, and further enhancing its AI-driven threat detection capabilities. This infusion of capital, following previous rounds, suggests strong investor confidence in the company's disruptive model and its ability to address the evolving challenges in cybersecurity. Sublime Security is poised to scale its operations and solidify its position as a leader in open, community-powered email security.
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