General Services Administration NAICS 488999 and PSC D399 contractors

All Other Support Activities for Transportation. IT AND TELECOM- OTHER IT AND TELECOMMUNICATIONS. Use this deeper buyer cross-code page to see which visible contractors sit in the overlap between these two lanes under General Services Administration.

General Services Administration · NAICS 488999 · PSC D399

Last updated: April 8, 2026

Visible recipients

Mapped obligations

$1,945,327,473

State overlap

Top recipients

Visible recipients in the General Services Administration overlap of NAICS 488999 and PSC D399

Mantech Advanced Systems International, Inc.

Herndon, VA

Mantech Advanced Systems International, Inc. is a federal category business profile based in Herndon, VA. The current public data layer shows $878,752,678 in visible federal obligations across 684 awards or transactions. Department of Defense appears as the strongest visible awarding agency. Top industry concentration is in NAICS 541330 (Engineering Services). The profile also shows meaningful product and service activity in PSC R425.

$1,945,327,473