Servicios Auxiliares De Puertos SA

Servicios Auxiliares De Puertos SA, operating through its Servicios Auxiliares De Puerto division and doing business as Sertosa, is a Spanish maritime services company based in Ceuta that provides tugboat and vessel towing services to the U.S. Navy as a prime contractor, with no subcontract work in the federal space. The vendor operates exclusively in full-and-open competition with no set-aside designations across its entire prime footprint of 1,155 awards.

Sertosa delivers ship towing and port auxiliary services—tugboat assistance for vessel arrivals, departures, berth shifting, and standby operations—to support U.S. Navy logistics and operational readiness in Spanish ports, particularly Naval Station Rota. The vendor's work is grounded in a single-award indefinite delivery contract with the Naval Supply Systems Command valued at $6,874,818.82 and running through November 30, 2026, awarded on November 3, 2021. Under this IDV, multiple Navy commands issue delivery orders for discrete towing requirements. Representative task orders include a $187,655.16 delivery order from Naval Supply Systems Command in January 2024 for ship towing services, a $146,090.58 order from Military Sealift Command in August 2025 for vessel movements support, and a $83,286.74 order from Navy Installations Command in March 2026 for tugboat services supporting USS ships. Individual delivery orders typically range from several thousand dollars to nearly $200,000.

Customer concentration is heavily weighted to the Department of the Navy across multiple subordinate commands. The top five customers account for 97% of awards, with Navy Installations Command leading by volume (472 awards, $10.4 million combined potential value), followed by U.S. Fleet Forces Command (Atlantic Fleet) at 321 awards ($3.7 million), Military Sealift Command at 237 awards ($5.7 million), and Naval Supply Systems Command at 63 awards ($15.7 million). The dollar rankings diverge slightly—Naval Supply Systems Command anchors the most potential value despite fewer award counts, reflecting its role as the contracting office for the primary IDV. All work is performed in Spain with no domestic U.S. presence.

Sertosa operates across four principal Navy IDVs. Contract N6817117D6000 (435 task orders, $5.8 million combined potential value) serves as a core vehicle for Navy Installations Command and Military Sealift Command towing requirements. Contract N6817105D0011 (313 task orders, $2.7 million) and Contract N6817111D0014 (285 task orders, $4.1 million) distribute work across Navy commands. Contract N6817122D6000 (117 task orders, $4.9 million) provides additional capacity. The vendor's award portfolio reflects consistent activity—31 awards in 2022, declining to 25–26 per year in 2023–2024, and 25 in 2025, with five awards captured in early 2026. Work is categorized primarily under NAICS Navigational Services to Shipping (1,155 awards) and PSC code for Vessel Towing (1,056 awards). The combined potential value across all awards stands at approximately $36 million, with $18.3 million obligated (51% of ceiling). Awards are nearly 100% prime; the vendor holds no subcontract positions. A sole-proprietor for-profit organization registered in SAM since April 2004, Sertosa has established itself as the primary maritime logistics provider to the U.S. Navy in Mediterranean Spanish ports over two decades, with no diversification into other customer agencies or service lines.