Protonex LLC

Protonex LLC, doing business as PNI Sensor, manufactures positioning, navigation, and magnetometer sensors for defense applications as a small business prime contractor, competing predominantly under total small business set-asides across SBIR and STTR programs. The company is a for-profit limited liability partnership and manufacturer of goods based in Windsor and Santa Rosa, California, with recent federal awards concentrated in Air Force Research Laboratory R&D contracts for advanced magnetic navigation and inertial tracking systems designed for GPS-denied and GPS-contested environments.

Customer concentration is acute and tilts heavily toward the Air Force. The Air Force Research Laboratory dominates the portfolio with 8 awards carrying $5.5 million in combined potential value (83% of total), while the Department of the Navy Naval Sea Systems Command accounts for 5 awards worth $898 thousand. The Department of the Army contributes 4 awards but with smaller individual values. All four distinct customer agencies present are Department of Defense stakeholders. Protonex sits on an Indefinite Delivery Contract with Naval Sea Systems Command (N6660419DH900) for magnetometers, which has generated 4 task orders worth $374 thousand, and holds a separate IDC with the Army (W91CRB18D0007) generating 2 task orders.

Recent capability work spans advanced magnetic navigation systems for aircraft, hardened vector magnetometers for manned and unmanned platforms, GPS-resilient pilot locator beacons, space magnetometers for low Earth orbit satellite attitude determination, and tightly coupled inertial-GPS tracking modules designed for electronic warfare resilience. Representative SBIR and STTR awards include an $1.25 million Phase II contract (awarded July 2025) for an enhanced pilot locator beacon for GPS-denied environments, an $1.40 million Phase II award (April 2024) for a low-SWAP-C vector magnetometer supporting multiple defense platforms, and a $1.22 million Phase II effort (February 2024) for integration of the Field Ops Remote Tracker inertial module with commercial GPS to create EW-resilient positioning. A smaller $109,971 STTR Phase I award (January 2025) targets extremely low-cost, low-power magnetometers for satellite attitude determination.

Activity peaked in 2023 with five awards, declining to one award year-to-date in 2026. Only one award (combined potential value $1.2 million) reaches ultimate completion within the next twenty-four months, creating minimal near-term recompete exposure. Protonex holds a minor subcontractor footprint, appearing as a sub to L3 Technologies on optical-system work (updates to delivery address noted in 2023) and as a supplier under a seven-year ordering period for STORM II sensor systems. The vendor's posture is consistently small-business set-aside across prime awards, with no full-and-open competition in recent federal work, and all task orders on parent vehicles flow through SBIR/STTR mechanisms or standing IDCs with Navy and Army, reflecting the company's R&D-focused positioning within the defense sensor supply chain rather than broad production or prime-contract manufacturing.