MES Tokki & Engineering Co., LTD.

MES Tokki & Engineering Co., LTD., a foreign-owned Japanese subsidiary of Mitsui E&S Holdings Co., LTD., operates exclusively as a prime contractor delivering preventive maintenance, repair, and engineering services for U.S. Navy facilities in Japan. All nineteen awards in the source are full-and-open prime contracts with no set-aside designation; the vendor does not pursue or hold small-business certifications.

MES Tokki's work centers on exhaust air treatment and wastewater treatment system maintenance at Navy installations in Yokosuka, Japan, with specialized focus on firefighting training facilities and environmental infrastructure repair. Recent representative work includes a $2.63 million delivery order (awarded August 1, 2025, second option period) for preventive maintenance services at Commander Fleet Activities Yokosuka running through August 31, 2026; a $724 thousand delivery order (March 6, 2026) for exhaust fan replacement at a Navy installation in Japan with ultimate completion February 24, 2028; and a $1.27 million first option-period recurring maintenance obligation (June 28, 2024) for scheduled and unscheduled maintenance of exhaust air and wastewater facilities at the Yokosuka firefighting training site. Work is categorized primarily under NAICS 333611 (Commercial and Industrial Machinery and Equipment Repair and Maintenance), reflecting the vendor's mechanical systems and infrastructure focus.

Customer concentration is absolute and singular: the Department of the Navy Installations Command anchors the footprint with twelve awards totaling $40.9 million combined potential value (88% of all awards by dollar magnitude). The Department of the Navy's Naval Facilities Engineering Command, Bureau of Naval Personnel, and Naval Sea Systems Command account for the remaining seven awards totaling $5.7 million. All performance occurs in Japan.

MES Tokki sits on two single-award indefinite delivery vehicles: indefinite delivery contract N4008423D0406 (ceiling $17.08 million, running through August 31, 2028, awarded August 15, 2023) with six task orders totaling $5.5 million, and indefinite delivery contract N4008418D0413 with six task orders totaling $6.5 million. These vehicles are the primary vehicle-based ordering mechanism for Navy maintenance requirements at Yokosuka and related overseas installations. Combined obligated dollars across all awards total $23.4 million (50% of the $46.7 million combined potential value). Two awards face ultimate completion in the next twenty-four months with combined potential value of $3.4 million. Award volume has been episodic — one in 2022, three in 2023, two in 2024, two in 2025, and one in 2026 — reflecting the recurring option-period structure of the underlying indefinite delivery contracts rather than new customer acquisition.