Tsontos, Michael M., S.A.

Tsontos, Michael M., S.A. (trading as Michael M. Tsontos SA Chania Sucursala Bucuresti Division), a Greece-based international construction and facilities engineering firm headquartered in Chania with regional operations in Bucharest, Romania, delivers infrastructure modernization, building renovation, electrical system upgrades, and facilities support services exclusively as a prime contractor (100% of recent awards) to the U.S. Department of Defense across southeastern Europe, primarily at Naval Support Activity Souda Bay and related NATO installations in Greece. The vendor competes full-and-open with no small business set-aside designations across its prime footprint.

Tsontos operates as a regional monopoly supplier for facilities work at U.S. military installations in Greece and Romania. The Department of the Navy dominates customer concentration by both volume and dollars: the Navy Installations Command accounts for 300 awards ($137.4 million combined potential value) and Naval Facilities Engineering Command for 126 awards ($204.9 million combined potential value), together representing 90% of awards. However, the top-customer ranking by potential value diverges significantly—the Department of the Army European Command anchors the dollars at $395.8 million combined potential value across only 11 awards, reflecting Tsontos's position on a $49 million Design-Bid-Build indefinite delivery contract for defense operations in Greece (ultimate completion September 2027). Recent representative work includes a $6.6 million Naval Facilities Engineering Command delivery order (August 2024) for fire pump capacity increase and fire water storage tank expansion in Greece; a $4.4 million Navy Installations Command delivery order (March 2026) for YK-9 ordnance tunnel renovation and concrete apron construction; a $2.8 million Navy Installations Command delivery order (March 2026) for provision of twenty expeditionary bunkers at NSA Souda Bay and Marathi K9 and K14 Pier; and a $2.97 million delivery order (September 2022) for generator repair services. Tsontos also holds a newly awarded $75 million multiple-award construction IDIQ with Naval Facilities Engineering Command (September 2025, expiring September 2030) for sustainment, restoration, and modernization at Naval Support Activity Souda Bay, Malaxa Communication Site, Marathi Greek Navy Base, NATO Hellenic Navy Ammunition Command Sites, and NATO Petroleum, Oils, and Lubricants Depot Marathi, with individual task orders expected to range from $500,000 to $5 million.

Tsontos's vehicle position centers on Navy-issued task order contracts. The top five parent vehicles carry 451 task orders and $114.5 million combined potential value: Indefinite Delivery Contract N3319112D0628 (142 task orders, $28.4 million), Indefinite Delivery Contract N3319108D0203 (132 task orders, $26.9 million), Indefinite Delivery Contract N3319116D0601 (110 task orders, $16.1 million), Indefinite Delivery Contract N3319121D0004 (57 task orders, $27.1 million), and the legacy Souda Bay Construction MACC 2016-2021 (14 task orders, $16.5 million). All parent vehicles are Navy-issued IDIQs; Tsontos does not participate in GSA Schedules, GWACs, or other government-wide vehicles.

Capability concentration reflects Souda Bay's infrastructure footprint. NAICS coding shows 477 awards (91% of prime awards) under Commercial and Institutional Building Construction, with PSC concentration in maintenance and repair of office and administrative buildings, alteration of non-building facilities, and miscellaneous building construction. Exemplar task orders span generator repair and maintenance, electrical system design and installation (fire reporting systems, distributed energy systems at substations, antenna installation), fuel system compliance remediation and storage tank repair, stormwater and sewer infrastructure repair, building envelope and structural repairs, ballistic glass and door replacement, HVAC work, and routine facilities maintenance (street lighting, power panels, corrosion control).

Activity has declined from 21 awards in 2022 to 2 awards year-to-date in 2026, indicating either a slowdown in new task order generation or a shift to larger, longer-duration orders under the newly awarded $75 million IDIQ. Five awards (combined potential value $13.2 million) reach ultimate completion in the next twenty-four months and face recompete exposure. Tsontos holds minimal sub-award footprint: two sub-awards to Serco Inc. (October 2025 for AT/FP Other Direct Costs services and July 2023 for AT/FP materials realignment) with no dollar values disclosed. Across 525 total awards spanning from 2004 through March 2026, Tsontos has obligated $159.5 million against a $774.1 million combined potential value (21% obligated rate), reflecting the early-stage or task-order-dependent nature of many IDIQ vehicles.