Raised $240M across disclosed rounds.[7][1][3][9]

Series C closed October 2025, led by Georgian.[1][5][8][4]

post-money valuation is not publicly disclosed.

Named investors include Georgian, IVP, Index Ventures, Avenir, 01A, Citi Ventures, Slow Ventures, Decibel Partners.[1][5][6][9]

Proofpoint · proofpoint.com · Same buyer (enterprise security teams), same workflow (inbound email threat detection and response), same budget line (SEG/email security platform); listed as a direct competitor in Sublime's own competitor taxonomy.[21]

Mimecast · mimecast.com · Same buyer (enterprise and mid-market security teams), same workflow (email-borne threat detection), same product category (cloud email security gateway); listed as a direct competitor in Sublime's competitor taxonomy.[21]

IRONSCALES · ironscales.com · Same buyer (SOC and security teams), same workflow (phishing detection and user-reported email triage), overlapping AI-agent positioning for autonomous email response; listed as a direct competitor in Sublime's competitor taxonomy.[21]

Cofense · cofense.com · Same workflow (user-reported phishing triage and SOC response automation) that Sublime's Autonomous Security Analyst agent directly targets; listed as a direct competitor in Sublime's competitor taxonomy.