Expel is a managed detection and response (MDR) provider. Their analysts run 24/7 security operations on top of Expel Workbench, an in-house platform that pairs SOC experts with an AI and automation engine. Services span MDR, managed SIEM, phishing investigation, and threat hunting.

Founded in 2016 by Dave Merkel, Justin Bajko, and Yanek Korff. Headquartered in Herndon, Virginia. Hit $1B+ valuation in November 2021 and expanded into EMEA in October 2022.

Stated mission: "to evolve security operations through practitioner-led, AI-augmented solutions that adapt to our customers, integrate easily, and prove value with measurable outcomes."

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