Sielman S.A.

Sielman S.A., a Greece-based for-profit defense contractor, provides depot-level diagnostic, repair, and maintenance services for HAWK air defense missile system components as a prime contractor on single-award indefinite-delivery contracts with the U.S. Army Aviation and Missile Command (AMCOM), with all work performed in Greece and no set-aside designation across its federal footprint.

Sielman S.A. is headquartered in Aisonia, Greece, and has been registered in the System for Award Management since April 2002. The company operates exclusively as a prime contractor (100% of recent awards) with no subcontract relationships in the federal space. Its capability portfolio centers on HAWK weapon system sustainment — specifically comprehensive depot-level diagnostic evaluation, component teardown, testing, repair, and maintenance of secondary assemblies and subassemblies supporting Foreign Military Sales customers and Ukraine. Recent representative work includes a $3.53 million cost-plus-fixed-fee delivery order from AMCOM on June 15, 2026, for analog-to-digital conversion of four Spanish HAWK missile launchers, completing December 31, 2026; a $12.07 million cost-plus-fixed-fee order awarded September 2, 2025, for depot-level repair and maintenance, completing June 30, 2026; and a $10.4 million cost-plus-fixed-fee delivery order from April 3, 2025, for secondary assembly and subassembly repair, completing December 31, 2025.

Customer concentration is near-total with AMCOM. The top funding agency — Department of the Army Materiel Command Aviation and Missile Life Cycle Management Command — accounts for 37 awards and $396.7 million in combined potential value (88% of award count and 100% of potential-value ranking across the top five agencies). The remaining customer agencies (Department of the Army, Defense Logistics Agency Land and Maritime, Defense Logistics Agency, and Contracting Command Detroit Arsenal) represent small dollar volume and transactional diversity rather than strategic relationship anchors.

Sielman holds two substantial single-award IDIQs with AMCOM. The first, awarded February 26, 2024, carries a $49.97 million ceiling through June 30, 2029, for general Foreign Military Sales HAWK depot-level work, with 20 task orders totaling $15.3 million in combined potential value. The second, awarded November 14, 2023, carries a $234.22 million ceiling through September 28, 2029, specifically for Ukraine HAWK system support, with 12 task orders totaling $47.8 million in combined potential value. Both contracts use cost-plus-fixed-fee and firm fixed-price pricing structures and were awarded through full and open competition. The combined $284.2 million IDIQ ceiling represents the core vehicle through which all recent AMCOM task orders flow; Sielman operates as the sole-source depot-level repair provider for AMCOM's HAWK system operations across all FMS customers, including Spain and Ukraine.

Activity has been steady at 5–7 awards per year over the past four years (2022–2025), with one award recorded in 2026 to date. The recompete exposure in the next twenty-four months is minimal — only two awards with combined potential value of $5.7 million reach ultimate completion by October 2026, indicating that Sielman's IDIQ positions and task-order pipeline extend well into 2027–2029.