What Does SDN Stand For In OFAC?

If you have ever dealt with U.S. sanctions compliance, you have almost certainly encountered the acronym “SDN.” It appears in bank rejection notices, compliance software alerts, due diligence reports, and law enforcement actions. But what does SDN actually mean, and why does appearing on the SDN list have such devastating consequences for individuals and companies? This article provides a comprehensive explanation of the SDN list — what it is, who ends up on it, what the practical effects are, and how a designated party can fight to get removed. If you or your company has been designated, contact our sanctions lawyers immediately — time-sensitive actions are often required to protect your interests.

What SDN Stands For

SDN stands for Specially Designated Nationals and Blocked Persons. The full title of the list is the “Specially Designated Nationals and Blocked Persons List,” commonly abbreviated as the SDN list or simply the SDN. It is maintained and published by the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC). The SDN list is the primary tool through which OFAC implements economic sanctions — once a person or entity is added, their assets within U.S. jurisdiction are frozen and U.S. persons are prohibited from dealing with them in virtually any capacity.

The Scale and Scope of the SDN List

As of 2026, the SDN list contains over 12,000 entries. These entries include individual people (citizens of dozens of countries), corporations, financial institutions, vessels, aircraft, and other entities. Entries are drawn from more than 30 separate U.S. sanctions programs covering everything from international terrorism and narcotics trafficking to weapons proliferation, cybercrime, human rights abuses, and the foreign policies of specific countries. Understanding what it means to be sanctioned is critical for anyone who interacts with international counterparties — the list spans the globe and no geographic region is immune.

How Entities Are Added to the SDN List

OFAC designates parties under legal authority granted by executive orders and Congressional statutes. The process generally works as follows:

• Intelligence gathering: OFAC, working with the CIA, FBI, DEA, and other intelligence and law enforcement agencies, identifies individuals or entities whose activities threaten U.S. national security, foreign policy, or economic interests.
• Legal review: OFAC lawyers review the evidence to determine whether it meets the legal standard for designation under the applicable sanctions authority (e.g., executive order, statute).
• Designation decision: A senior OFAC official approves the designation. In some cases, designations are coordinated with allied governments (the EU, UK, UN, etc.) to create multilateral sanctions.
• Publication: The new SDN entry is published on the OFAC website, typically with a press release describing the basis for designation. The SDN list is updated multiple times per week.

Designation can happen without advance notice to the designated party. In fact, OFAC typically does not provide pre-designation notice precisely because doing so would allow assets to be moved or hidden before blocking occurs. For the same reason, newly designated parties often first learn of their designation when their bank accounts are frozen or a counterparty refuses to transact with them. When this happens, retaining an OFAC attorney as quickly as possible is essential.

SDN Categories and Program Tags

Each SDN entry is tagged with one or more program identifiers that indicate which sanctions program(s) apply and sometimes the specific category of designation. Key categories include:

• SDGT (Specially Designated Global Terrorist): Designated under Executive Order 13224 for supporting or engaging in international terrorism. This is one of the most common and broad SDN categories, applied to individuals and organizations linked to groups like al-Qaeda, Hezbollah, and others.
• SDNT (Specially Designated Narcotics Trafficker): Designated under the Kingpin Act or other narcotics authorities for involvement in international drug trafficking.
• SDNTK (Specially Designated Narcotics Trafficker — Kingpin): A subcategory specifically for major drug trafficking organizations and their leadership under the Foreign Narcotics Kingpin Designation Act.
• NPWMD (Non-Proliferation — Weapons of Mass Destruction): Designated for involvement in the proliferation of nuclear, chemical, or biological weapons or their delivery systems.
• CYBER: Designated under Executive Order 13694 and its successors for malicious cyber activities.
• RUSSIA-EO14024: Designated under the Russia-related executive orders, covering individuals and entities that support Russia’s government, military, or defense-industrial base.
• IRAN: Designated under various Iran-related authorities, covering entities involved with the Iranian government, Revolutionary Guards, energy sector, or financial system.

The program tag determines the legal basis and, to some extent, the scope of the blocking and dealing prohibitions. Some programs allow for more general license exceptions than others. OFAC compliance lawyers must analyze both the SDN designation itself and the applicable program rules when advising clients on available options.

The 50% Rule: Indirect Designations

One of the most important — and often surprising — aspects of the SDN framework is the 50% Rule. Under this OFAC policy, any entity that is owned 50% or more (directly or indirectly, individually or in aggregate) by one or more SDN-listed persons is itself treated as blocked, even if that entity’s name never appears on the SDN list. This rule has enormous practical implications:

• A company owned 51% by a single SDN is blocked.
• A company owned 30% by SDN A and 25% by SDN B is blocked (combined ownership exceeds 50%).
• A chain of holding companies where the ultimate beneficial owner is an SDN can result in the entire chain being blocked, even if none of the intermediate entities appear on the list.

For this reason, screening only against the SDN list itself is insufficient. Effective compliance requires ownership verification — understanding who ultimately owns and controls a counterparty. Sanctions database screening tools that incorporate beneficial ownership data are essential for managing this risk. Holding or receiving blocked property from an entity caught by the 50% Rule carries the same liability as dealing with a named SDN.

What Being on the SDN List Means in Practice

The consequences of SDN designation are immediate and severe:

• Asset blocking: All property and interests in property of the designated party that are within U.S. jurisdiction — or come within U.S. jurisdiction — are immediately frozen. U.S. persons holding such assets must block them and report the blocking to OFAC within 10 business days.
• Transaction prohibition: U.S. persons are prohibited from engaging in any transactions with the SDN — this includes payments, loans, goods, services, and even communications that have commercial value.
• Global banking consequences: Even outside the United States, SDN-listed parties find their access to international banking severely restricted. Major global banks screen against the SDN list as part of their own compliance programs, often regardless of where the transaction occurs.
• Reputational damage: SDN designation is public. Press releases from OFAC often describe the designated party’s alleged conduct in detail, creating immediate and lasting reputational harm that affects business relationships, credit, and employment.
• Travel and visa restrictions: Designation may trigger U.S. visa denial or revocation, complicating international travel even in non-U.S. jurisdictions that defer to U.S. sanctions frameworks.

When a company’s assets are frozen as a result of SDN designation, an urgent priority is working to release blocked funds through the applicable legal channels, which may require an OFAC license or a successful administrative challenge to the designation itself.

How to Check the SDN List

OFAC publishes the SDN list on its official website in multiple formats — XML, fixed-field, and CSV — that can be downloaded and integrated into compliance software systems. For individual lookups, OFAC provides an online search tool. However, manual searching of the SDN list is insufficient for most compliance programs because:

• The list is updated multiple times per week and manual searches become outdated quickly.
• Name matching requires fuzzy logic to account for transliterations, aliases, and spelling variations — a simple keyword search will miss many matches.
• The SDN list is only one of several lists that must be screened (it does not include the Non-SDN FSE list, the SSI list, or Consolidated Sanctions lists).
• The 50% Rule requires ownership data that is not contained in the SDN list itself.

Automated screening solutions — such as the World-Check database, LexisNexis Bridger, Dow Jones Risk & Compliance, and others — provide real-time SDN screening with fuzzy matching, alias detection, and ownership structure analysis. These tools are standard in financial institutions and are increasingly expected by regulators across all industries with sanctions exposure. For a comprehensive approach to counter-party vetting, working with experienced OFAC compliance lawyers can help design a screening program proportionate to your risk profile.

How to Get Removed from the SDN List

SDN designation is not necessarily permanent. OFAC has a formal administrative process for challenging designations and requesting removal (delisting). The process involves:

• Reconsideration petition: The designated party submits a written petition to OFAC providing evidence that the designation was made in error, that the basis for designation no longer exists, or that changed circumstances warrant removal. This is the primary pathway for SDN list removal.
• Evidence submission: The petition must address each basis for designation identified in the SDN entry and provide supporting documentation — business records, financial records, legal analysis, witness statements, and any other evidence that undermines the factual or legal basis for designation.
• OFAC review: OFAC reviews the petition internally. There is no formal hearing before an independent tribunal; the same agency that made the designation reviews the request for reconsideration.
• Judicial challenge: In some cases, particularly where the designation is based on an alleged error of fact, it may be possible to challenge the designation in U.S. federal court under the Administrative Procedure Act. Courts review OFAC designations under a deferential standard, but successful challenges have been brought in appropriate cases.

The OFAC delisting process is technical, time-consuming, and requires a sophisticated understanding of both the evidentiary record and the applicable legal standards. The stakes are high — a failed petition without proper legal support can waste years and leave the designated party in a worse position. Learn more about how to get off the OFAC list and what factors OFAC considers when evaluating delisting requests.

Frequently Asked Questions

Can a company be on the SDN list without its name appearing there?

Yes. Under OFAC’s 50% Rule, any entity owned 50% or more by one or more SDN-listed persons is treated as blocked — even if that entity’s name is not on the list. This means companies must verify the ownership structure of counterparties, not just check their names against the SDN list directly.

What happens to a U.S. bank account if the holder is designated as an SDN?

The bank is legally required to immediately block (freeze) the account. The funds become blocked property and cannot be withdrawn, transferred, or accessed without an OFAC license. The bank must report the blocking to OFAC within 10 business days. The account holder can apply to OFAC for a specific license to access blocked funds for specific purposes, such as paying legal fees to challenge the designation.

How long does it take to get off the SDN list?

There is no fixed timeline. OFAC reviews delisting petitions at its own pace, and the process can take months to years depending on the complexity of the designation, the strength of the evidentiary record, and OFAC’s current caseload. Engaging experienced SDN delisting petition counsel early and submitting a thorough, well-documented petition is the most effective way to expedite the process.

Are SDN designations coordinated with other countries’ sanctions lists?

Often, yes. The United States frequently coordinates designations with the European Union, United Kingdom, Canada, Australia, and the United Nations Security Council — resulting in multilateral sanctions that affect the designated party’s ability to operate in multiple jurisdictions simultaneously. However, designation by one country does not automatically result in designation by others, and the legal standards and delisting processes differ across jurisdictions.

Can a designated party continue to receive legal representation?

Yes, with conditions. U.S. lawyers may represent SDN-designated parties for the purpose of challenging their designation or obtaining an OFAC license — these are considered authorized legal services under OFAC guidelines. Payment of legal fees may require an OFAC license in some circumstances. OFAC enforcement defense counsel can advise on how to structure legal representation arrangements that comply with applicable rules while vigorously defending the designated party’s rights.