Epsilon C5I Inc.

Epsilon C5I Inc., a 100% employee-owned subsidiary of Epsilon Systems Solutions Inc., provides command, control, communications, computers, cybersecurity, and intelligence (C5I) systems development, research and development, and technical intelligence analysis to the Department of Defense and intelligence agencies as a prime contractor (97% of recent awards), competing predominantly full-and-open with no recurring set-aside posture despite holding several small-business set-aside delivery orders on parent IDIQs.

The vendor is headquartered in San Diego, California and operates across engineering services and defense R&D domains under primary NAICS 541512 (Computer Systems Design Services) and 541710 (Research and Development in the Physical, Engineering, and Life Sciences). Customer concentration heavily favors Navy and Air Force intelligence and ISR programs. The Naval Information Warfare Systems Command leads by award count with 36 awards worth $969.7 million combined potential value; the Air Force's National Air and Space Intelligence Center follows with 14 awards anchoring $4.86 billion in potential value; the Naval Air Warfare Center and Naval Sea Systems Command round out the top tier. Naval Sea Systems Command carries exceptional leverage: three awards (likely including the SeaPort-e vehicle work) represent $72.55 billion of the vendor's combined $78.89 billion total pipeline — a single customer concentration spike driven by platform engineering and sustainment work rather than R&D volume. Epsilon C5I holds a seat on the $151 billion SHIELD (Scalable Homeland Innovative Enterprise Layered Defense) multiple-award IDIQ awarded by the Missile Defense Agency on December 29, 2025, in addition to the $4.8 billion NOVASTAR multiple-award IDIQ with the National Air and Space Intelligence Center, a $169 million Enterprise Personnel Systems Engineering IDC with Naval Information Warfare Systems Command, a $249 million Joint Artificial Intelligence Center Test and Evaluation BPA with the Office of the Secretary of Defense, and the multi-billion-dollar SeaPort-e vehicle under which the Naval Sea Systems Command exposure sits.

Recent prime capability work includes a $3.99 million Air Force delivery order for space-based ISR analysis under NOVASTAR (September 2025), an $18.5 million Office of Naval Research definitive contract for Tactical Applications for Containerized Knowledge and Logistics Execution (August 2025), a $14.9 million Naval Information Warfare Systems Command delivery order for Test Automation Framework engineering and technical support under the Enterprise Personnel Systems Engineering vehicle (February 2025), a $1.7 million NOVASTAR delivery order for GEOINT Scene Prediction R&D from the National Air and Space Intelligence Center (September 2025), and a $6.2 million NOVASTAR delivery order for Special Mission, Fighter, Bomber aircraft analysis (July 2024). The vendor also holds multiple Small Business Innovation Research Phase III delivery orders with the Naval Air Warfare Center: a $11.96 billion ceiling delivery order (June 2025, under total small business set-aside), and predecessor Phase III orders valued at $17.1 million (September 2023, through September 2024) and $6.9 million (September 2022, through December 2023), all performed in San Diego. Activity has grown from six awards in 2022 to fourteen in 2025, with fourteen awards (combined potential value $88.2 million) scheduled to complete within the next twenty-four months and therefore facing recompete exposure.

Across SCI-reportable service contracts, the vendor invoiced $3.6 million in FY2024 across 11.7 FTEs, reflecting a government-paid rate of $145.63 per hour. On these prime contracts, Epsilon C5I subcontracted 59% of reported contractor hours to five named subcontractors, indicating a reliance on sub capacity for mission execution. Named sub work includes systems engineering, in-service engineering activity, and training services under Leidos (Distributed Common Ground Station Navy sustainment, April 2025) and mission awareness capabilities work under Applied Research Associates (December 2023).

Epsilon C5I operates as a prime on full-and-open competition vehicles (SHIELD, OASIS+ Unrestricted, SeaPort-e) and holds competitive and set-aside positions on NOVASTAR and the Naval Air Warfare Center SBIR Phase III vehicle. The vendor's recent activity split — 14 awards per year in 2025, with a $78.89 billion combined pipeline concentrated in Navy and Air Force intelligence platforms — reflects a defense and intelligence customer base with sustained R&D and platform sustainment demand, offset by extreme concentration risk in a single Naval Sea Systems Command relationship.

Software & systems engineering support for C4ISR, digital signal processing (DSP), cryptology/information operations, and defense communications systems.