Abnormal Security vs SentinelOne

By valuation, Abnormal Security is the larger company at $5.1B versus $4.7B — a 1.1x difference. Size can also be measured by team: Abnormal Security employs 650 people while SentinelOne has 2800 employees.

SentinelOne has raised more in total funding at $697M, compared to Abnormal Security's $546M — a gap of $151M. Combined, the two companies have completed 10 known funding rounds.

Abnormal Security leads with an Awaira Score of 80/100, while SentinelOne sits at 76/100. That 4-point gap reflects real differences in funding, scale, and traction — it's not a vanity metric.

Abnormal Security was founded by Evan Reiser in 2018. SentinelOne was founded by Tomer Weingarten in 2013. Visit each company's profile on Awaira for a full founder biography.

Abnormal Security: Abnormal Security is an AI-focused cybersecurity company founded in 2018 that specializes in email and cloud security. The company develops AI-powered threat detection systems designed to identify and prevent advanced email attacks, including phishing, business email compromise (BEC), and account takeover attempts. Its core platform uses behavioral AI and machine learning to analyze communication patterns and detect anomalies that traditional security tools miss. The company's technology focuses on cloud email environments, particularly Microsoft 365 and Google Workspace, where it monitors user behavior, message content, and sender patterns in real-time. Abnormal Security has achieved a valuation of $5.1 billion following Series D funding, with total funding of $546 million. The company operates in a competitive landscape alongside established vendors like Proofpoint, Mimecast, and Cisco, as well as emerging AI security startups. Its positioning emphasizes reducing security alert fatigue through AI accuracy while preventing targeted attacks that evade traditional signature-based detection. The company has secured enterprise customers across various industries, though specific customer names are not widely disclosed. Growth trajectory indicates strong market demand for AI-driven email security solutions as organizations face increasingly sophisticated social engineering attacks. Abnormal Security represents the broader shift toward behavioral AI in enterprise security infrastructure. Abnormal Security applies behavioral AI specifically to email security, addressing a historically high-friction attack vector that traditional tools struggle to defend against effectively. SentinelOne: SentinelOne is a cybersecurity company founded in 2013 that specializes in endpoint protection and threat detection using artificial intelligence and machine learning. The company develops autonomous endpoint protection platforms designed to detect, prevent, and respond to cyberattacks in real-time. Its core product suite includes Singularity, an AI-powered platform that provides behavioral threat detection, incident response automation, and endpoint visibility across organizational networks. The company operates in the AI security category, employing machine learning models to identify previously unknown threats and malicious behaviors without relying solely on signature-based detection methods. SentinelOne's technology focuses on autonomous response capabilities, enabling systems to contain threats automatically before human intervention becomes necessary. SentinelOne went public in February 2021 on the New York Stock Exchange under ticker symbol S. As of the latest valuation data, the company is valued at approximately $4.7 billion. The company serves enterprises across various sectors requiring robust endpoint security solutions, competing with established vendors like CrowdStrike, Microsoft Defender, and Kaspersky in the crowded endpoint protection market. The company has demonstrated steady growth trajectory since its IPO, expanding its customer base and product capabilities. SentinelOne continues developing its AI-driven security platform to address evolving threats and expand market presence. SentinelOne distinguishes itself through autonomous response automation that enables endpoints to contain threats without human intervention.

SentinelOne got there first, launching in 2013 — that's 5 years of extra runway. Abnormal Security didn't arrive until 2018. In AI, that kind of head start means more training data, deeper customer relationships, and a bigger talent moat.

Abnormal Security has about 650 employees; SentinelOne has about 2800. A bigger team usually means more revenue or heavier VC backing, but in AI, small teams can build at massive scale.

Yes — they're direct rivals. Both Abnormal Security and SentinelOne compete in AI Security, targeting many of the same buyers. If you're evaluating one, you should be looking at the other.