Expel

Expel has established itself as an innovative managed detection and response provider since its 2016 founding, challenging traditional MSSP models with transparency and customer enablement. Headquartered in Herndon, Virginia, Expel was founded by former Mandiant executives who recognized that organizations needed better ways to operationalize their security tools. The company serves over 800 customers with a distributed team of security analysts.

Expel's MDR service requires customers to have existing security tools (SIEM, EDR, network detection, cloud security) which Expel then monitors 24/7. Rather than requiring Expel's proprietary technology, they integrate with customers' chosen platforms. Their transparent approach includes Expel Workbench, a portal where customers see every alert, investigation, and action Expel takes. Analysts provide detailed context and remediation guidance. Expel's service includes threat hunting, incident response coordination, and security engineering recommendations.

The company differentiates through radical transparency - customers see exactly what Expel's analysts do and can learn from their investigations. This enables customer security teams to improve their own capabilities over time rather than remaining dependent on the MSSP. Expel's integration-first approach means faster deployment than solutions requiring appliances or agents. They've maintained strong customer satisfaction scores and analyst ratings. However, the requirement for existing security tools means customers must make those investments separately.

For organizations that have invested in security tools but lack the people and expertise to monitor them effectively, Expel provides expert-led MDR that enhances rather than replaces internal capabilities. Their transparent approach suits security teams wanting to build skills while outsourcing 24/7 coverage. Best fit for mid-market to enterprise organizations with security tools deployed but insufficient staffing for round-the-clock monitoring and response.