NAICS 541990 and PSC AD93 contractors in Illinois

All Other Professional, Scientific, and Technical Services. R&D- DEFENSE OTHER: OTHER (ADVANCED DEVELOPMENT). Use this deeper state cross-code page to see which visible contractors sit in the overlap between these two lanes inside Illinois.

Illinois · NAICS 541990 · PSC AD93

Last updated: April 8, 2026

Visible recipients

Mapped obligations

$131,766,404

Buyer overlap

Top recipients

Visible recipients in the Illinois overlap of NAICS 541990 and PSC AD93

Alion Science And Technology Corporation

Chicago, IL

Alion Science And Technology Corporation is a federal category business profile based in Chicago, IL. The current public data layer shows $1,391,195,185 in visible federal obligations across 5 awards or transactions. Department of Defense appears as the strongest visible awarding agency. Top industry concentration is in NAICS 541710 (Research and Development in the Physical, Engineering, and Life Sciences). The profile also shows meaningful product and service activity in PSC AZ12.

$131,766,404