SDN List Explained: OFAC Sanctions
- Arne Mielken
- Sep 22, 2025
- 3 min read
🔒The SDN List blocks assets and bans dealings with designated individuals and companies. Stay compliant or risk frozen payments and penalties.
The Specially Designated Nationals and Blocked Persons List (SDN List) is one of the most powerful tools in U.S. foreign policy. Maintained by the Treasury Department’s Office of Foreign Assets Control (OFAC), it contains the names of individuals, companies, vessels, and even aircraft whose assets are blocked and with whom U.S. persons are generally prohibited from doing business.
Being added to this list is not symbolic. It’s financially crippling. Once designated, the target is effectively cut off from the U.S. financial system — and often from global trade, because non-U.S. businesses and banks usually steer clear to avoid secondary exposure.
Who Gets Designated?
Entities and individuals land on the SDN List for different reasons, including:
Acting on behalf of sanctioned governments.
Supporting terrorism or proliferation of weapons of mass destruction.
Engaging in narcotics trafficking or organized crime.
Facilitating human rights abuses, corruption, or cyberattacks.
Assisting sanctioned countries or sectors to evade restrictions.
This isn’t limited to U.S. adversaries. OFAC designates actors worldwide who undermine U.S. foreign policy and security interests.
What Does Designation Mean?
Asset Freeze: All assets of an SDN in U.S. jurisdiction are blocked. U.S. banks must freeze accounts, and U.S. persons cannot release funds.
No Dealings Allowed: U.S. persons — individuals, companies, banks — are prohibited from doing business with an SDN. That covers contracts, payments, services, and trade.
Ripple Effect: Even non-U.S. companies usually avoid SDNs. Working with them risks losing access to the U.S. market or becoming subject to secondary sanctions.
Why It Matters for Business
Hidden Links: An SDN may operate through front companies. If a counterparty is owned 50% or more by an SDN, it’s also blocked — even if not named directly.
Transaction Risks: Payments routed through U.S. banks can be frozen mid-transfer if linked to an SDN.
Reputational Damage: Even unintentional dealings with an SDN can draw regulatory scrutiny and damage credibility with customers and partners.
How to Stay Compliant
Screen counterparties regularly against the SDN List and related OFAC lists.
Map ownership structures to check for indirect control by designated persons.
Update contracts to include sanctions clauses allowing termination if a counterparty is designated.
Train teams so procurement, finance, and sales staff can spot red flags early.
Monitor changes — OFAC updates the list frequently, sometimes multiple times per week.
The Bottom Line
The SDN List is a cornerstone of U.S. sanctions enforcement. For companies, compliance isn’t optional. A single misstep can result in blocked payments, regulatory penalties, or reputational fallout. The right question isn’t just “is my counterparty legal?” but “could my counterparty or its owners be linked to an SDN?” In a world where sanctions shift fast, vigilance is the only safeguard.
Full listings here:
FULL LISTS:
CHANGES TO THE SDN LIST:
LISTS BY PROGRAM AND COUNTRY:
GUIDANCE:
HOW TO BE REMOVED FROM A SANCTIONS LIST:
How often is the Specially Designated Nationals (SDN) List updated?
The SDN list is frequently updated. There is no predetermined timetable, but rather names are added or removed as necessary and appropriate.
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