Nikkai Corporation

Nikkai Corporation, a Japanese for-profit defense contractor based in Yokosuka, Kanagawa, delivers facility construction, maintenance, renovation, and infrastructure repair services to the U.S. Navy at military installations throughout Japan and the Asia-Pacific region, operating exclusively as a prime contractor with no subcontract relationships. The vendor competes in full and open competition across its portfolio — all 707 awards in the source record carry no set-aside designations — and holds a dominant position on Navy construction and facility-management contracts.

Nikkai's customer concentration is heavily concentrated within the Department of the Navy, which accounts for substantially all of the vendor's federal work. The top five Navy-aligned organizations drive 95 percent of recent awards: the Navy Installations Command (260 awards, $455.5 million combined potential value), Naval Facilities Engineering Command (148 awards, $819.3 million), Naval Sea Systems Command (63 awards, $15.6 million), the Bureau of Medicine and Surgery (44 awards, $5.1 million), and the Defense Education Activity (7 awards, $4.1 million). The two rankings diverge significantly — NAVFAC anchors dollar magnitude while CNIC dominates award count — reflecting NAVFAC's role in awarding large multiple-award construction contracts under which CNIC issues smaller task orders.

Nikkai's primary parent vehicles are large Navy IDIQ frameworks. The vendor holds four major indefinite delivery contracts: a $250 million Kanto Japan Plains Operation Multiple Award Construction Contract (Kanto Plains MACC) awarded by NAVFAC on June 30, 2023, through June 29, 2028; a $49 million NAVFAC Far East Mini MACC for smaller design-bid-build projects, awarded March 4, 2025, through March 4, 2030; a single-award $16.4 million recurring contract with Navy Installations Command extending through September 11, 2028; and a $500,000 single-award contract for pump test bench maintenance at Commander Fleet Activities Yokosuka, awarded August 1, 2025, through July 31, 2030. The source also references two legacy IDIQ vehicles — N6283601D0180 and N4008407D0110 — against which 99 and 69 task orders have been issued respectively, though their ceilings and active dates are not fully enumerated. Recent representative task orders under these vehicles include a $11.5 million pump house repair at U.S. Fleet Activities Yokosuka (June 2025), a $6.2 million HVAC system replacement (June 2023), a $4.5 million main water pipe replacement near the main gate (April 2024), a $1.3 million structural assembly replacement on trainers (May 2024), and a $1.04 million air-compressor overhaul and motor rewind (March 2026).

Activity has remained moderate and episodic across the five-year look-back: five awards in 2022, twelve in 2023, seven in 2024, ten in 2025, and two in 2026 year-to-date. The vendor faces recompete exposure of 11 awards with combined potential value of $27 million completing within the next twenty-four months. The category concentration reflects the nature of the Navy installation support mission: the top NAICS codes are Other Foundation, Structure, and Building Exterior Contractors (160 awards), Commercial and Institutional Building Construction (150 awards), and Other General Government Support (99 awards). The top PSC categories are Construct/Misc Buildings (120 awards) and Maint-Rep-Alt/Misc Buildings (63 awards).

Nikkai's combined potential value across all 707 awards is $1.33 billion, with $221.6 million obligated to date (17 percent of potential). The vendor has served 17 distinct federal customer agencies across the record, though Navy organizations account for the vast majority of activity. The source notes that Nikkai has maintained federal contracting relationships since at least 2006, with over two decades of experience supporting U.S. military infrastructure in the region.