Abnormal Security
AS
Abnormal Security builds cloud-based security software that protects email and user accounts. Its products cover inbound email security, account takeover protection, security posture management, and email productivity features such as graymail filtering. The platform integrates with services including Microsoft 365 and Google Workspace and uses behavioral AI to detect anomalies.
Founded by Evan Reiser (Co-Founder & CEO), Sanjay Jeyakumar (Co-Founder & CTO)
Blended valuation$5.1B$5.1B secondary
Valuation history
Weekly blended valuation with priced funding rounds marked on the timeline.
$5.5B
blended valuationfunding round
May 31, 2021$131.5MOct 5, 2026
All rounds
5 funding rounds, newest first.
| Round | Announced | Raised | Post-money |
|---|---|---|---|
| Series D | Aug 6, 2024 | $250M | $5.1B |
| Round | Mar 29, 2023 | — | $4.3B |
| Series C | May 10, 2022 | $210M | $4B |
| Series B | Nov 18, 2020 | $50M | $500M |
| Series A | Nov 19, 2019 | $24M | $119.8M |
Investors
9 investors across all rounds.
- GRGreylock
- MVMenlo Ventures
- IPInsight Partners
- WMWellington Management
- BVBallistic Ventures
- TSThe Syndicate Group
- CFCrowdStrike Falcon Fund
- CRCrowdStrike
- JSJake Seid
Secondary market activity
Recent buy and sell interest for Abnormal Security shares on the secondary market.
| Kind | Implied valuation | Price / share | Date |
|---|---|---|---|
| $5.6B | — | Oct 6, 2026 | |
| $3B | $13.76 | Jul 24, 2026 | |
| $3.2B | $14.67 | Jul 17, 2026 |
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Data as of Oct 14, 2026. Valuations are estimates blended from primary and secondary-market signals — not investment advice.