Specially Designated Nationals and Blocked Persons List (SDN List)

The Specially Designated Nationals and Blocked Persons List, known universally as the SDN List, is maintained and published by the Office of Foreign Assets Control (OFAC), a bureau within the U.S. Department of the Treasury. Its statutory foundation rests primarily on the International Emergency Economic Powers Act (IEEPA, 50 U.S.C. §§ 1701–1708), the Trading with the Enemy Act of 1917 (50 U.S.C. App. §§ 1–44), the National Emergencies Act of 1976, and program-specific statutes such as the Kingpin Act (21 U.S.C. §§ 1901–1908), the Global Magnitsky Human Rights Accountability Act of 2016, and the Countering America's Adversaries Through Sanctions Act (CAATSA) of 2017. The operational authority flows through presidential executive orders that declare national emergencies and delegate designation power to the Secretaries of the Treasury and State; the consolidated regulations appear in 31 C.F.R. Chapter V.

Designation proceeds through an internal OFAC evidentiary package built by the agency's Office of Global Targeting, drawing on classified intelligence, open-source reporting, financial intelligence from FinCEN, and interagency input from State, Justice, and Defense. Once the Director of OFAC and, where required, the Secretary of the Treasury in consultation with the Secretary of State sign the designation memorandum, the target is added to the SDN List and published in the Federal Register. The legal consequence is automatic and immediate: all property and interests in property of the designated party within U.S. jurisdiction or in the possession of U.S. persons are blocked, meaning frozen in place. U.S. persons — defined to include U.S. citizens and permanent residents wherever located, entities organized under U.S. law including foreign branches, and any person physically in the United States — are prohibited from dealings with the SDN absent a specific or general license.

The List is structured by program tags (e.g., SDGT for Specially Designated Global Terrorists, SDNTK for narcotics kingpins, IRAN, RUSSIA-EO14024, UKRAINE-EO13662, VENEZUELA-EO13692, CYBER2). OFAC also enforces the 50 Percent Rule, articulated in guidance first issued in 2008 and revised in August 2014, under which any entity owned 50 percent or more, in the aggregate, by one or more SDNs is itself blocked by operation of law even if not separately listed. Delisting is governed by 31 C.F.R. § 501.807, which permits a designated party to submit a petition for reconsideration; OFAC may request additional information, propose remedial undertakings, or deny the petition, with judicial review available under the Administrative Procedure Act though courts apply highly deferential standards.

Contemporary practice has produced a sharply expanded List. Following Russia's February 2022 invasion of Ukraine, Treasury under Executive Order 14024 designated Sberbank, VTB, Alfa-Bank, and oligarchs including Roman Abramovich and Alisher Usmanov, while the United Kingdom's OFSI and the European Union's Consolidated List moved in parallel. The April 2024 designation of Iran's Islamic Revolutionary Guard Corps Cyber-Electronic Command, the December 2017 inaugural Global Magnitsky tranche targeting Myanmar general Maung Maung Soe and Gambian former president Yahya Jammeh, and the 2019 designation of Venezuela's state oil company PdVSA illustrate the instrument's breadth. The List is updated multiple times weekly and distributed via OFAC's Sanctions List Search portal and downloadable XML and delimited files used by compliance screening vendors.

The SDN List should be distinguished from several adjacent OFAC instruments. The Sectoral Sanctions Identifications (SSI) List, created under Executive Order 13662 in 2014, imposes narrower prohibitions — typically on new debt or equity beyond specified tenors — rather than full blocking. The Non-SDN Menu-Based Sanctions List (NS-MBS) under CAATSA permits the President to select from a menu of measures. The Foreign Sanctions Evaders List targets non-U.S. persons who have violated U.S. sanctions. The Entity List, by contrast, is administered by the Commerce Department's Bureau of Industry and Security under the Export Administration Regulations and restricts export licensing rather than blocking property. Conflation of these regimes is a common compliance error.

Several recurring controversies attend the List. Secondary sanctions provisions — most prominently under the Iran and Russia programs — expose non-U.S. financial institutions to correspondent account restrictions if they knowingly facilitate significant transactions with SDNs, generating extraterritoriality complaints from European capitals and prompting the EU Blocking Statute (Council Regulation 2271/96, updated 2018). The 2019 designation of the IRGC as a Foreign Terrorist Organization created intersection with State Department authorities. Humanitarian carve-outs were significantly broadened by General License 23 and the December 2022 issuance of cross-cutting humanitarian GLs following UN Security Council Resolution 2664, which established a standing humanitarian exemption across UN sanctions regimes. Litigation in cases such as KindHearts v. Geithner (N.D. Ohio 2009) and Al Haramain Islamic Foundation v. Treasury (9th Cir. 2011) has constrained OFAC's procedural latitude in domestic designations.

For the practitioner, the SDN List is the single most consequential sanctions instrument in the international financial system because the U.S. dollar's role in correspondent banking gives blocking near-global reach. Compliance officers at financial institutions, exporters, shipping firms, and law firms must screen counterparties at onboarding and on a recurring basis; diplomats and desk officers must understand designation as both a coercive tool and a signaling device in bilateral engagement; and policy analysts must track delistings and license issuances as indicators of negotiating posture, as seen in the staged Iran JCPOA implementation in January 2016 and the partial Venezuela license relief of October 2023.