Lists and Designations: SDN, Consolidated Lists, and the 50 Percent Rule

If sanctions are the law, the lists are how that law touches your systems every day. A designation isn't useful to a compliance team until it's published on a list your screening engine can read. So this lecture is practical: which lists exist, who owns them, and how to apply the most important rule that governs them.

The first habit to build is keeping your lists current, because they change constantly, sometimes several times a week. An out-of-date list is a control that has quietly stopped working. The exam expects you to know the major lists by name and by owner.

OFAC publishes two lists, and the difference matters. The Specially Designated Nationals and Blocked Persons list, the S-D-N List, names blocked persons: their property and interests in property must be frozen, and U.S.

persons are prohibited from virtually all dealings with them. The separate Consolidated Sanctions List gathers OFAC's non-S-D-N programs, such as the Sectoral Sanctions Identifications and Foreign Sanctions Evaders entries, where the prohibition is narrower than a full block. So when you get an OFAC hit, your first question is which list, because an S-D-N match means freeze and stop, while a Consolidated match may only restrict specific activity.

Treating every OFAC name as a full block is a classic over-correction the exam can test.

Beyond OFAC, you screen against the U.N. Consolidated List, which carries Security Council designations; the E.

U. Consolidated List, binding on persons in E.U.

territory; and the U.K.'s O-F-S-I Consolidated List of Financial Sanctions Targets.

These lists overlap heavily because many designations originate at the U.N., but they're not identical: each body adds its own autonomous names, and the same person can appear under different spellings, transliterations from other alphabets, dates of birth, or aliases.

That's why screening can't be a simple text match, a point we'll develop in the screening domain. For now, know the four list families, U.N.

, U.S., E.

U., U.K.

, and that you screen against the ones relevant to your footprint.

Now the single most tested rule in this domain: the 50 Percent Rule. Under OFAC's Revised Guidance of August thirteenth, twenty-fourteen, any entity that is owned fifty percent or more, directly or indirectly, by one or more blocked persons is itself considered blocked, even if that entity does not appear on any list. Read that twice.

The dangerous party may be invisible to a literal list search. And ownership aggregates: if two different S-D-N individuals each own thirty percent of a company, that's sixty percent combined, and the company is blocked. The rule looks at ownership, not the listing.

This is why beneficial-ownership analysis is core to sanctions, and why a clean name-screening result is not the end of your diligence.

The 50 Percent Rule has a direct, practical consequence: you can't stop at screening a name. You must understand who owns and controls a counterparty, and aggregate the blocked stakes. One nuance the exam tests: under OFAC's guidance, the bright line is fifty percent ownership; mere control or a smaller stake by a blocked person does not automatically block the entity, though OFAC warns you to use caution because it signals real risk.

Other regimes, including the E.U., weigh both ownership and control in their analysis, so don't assume the U.

S. bright line applies everywhere. Whatever the regime, document how you reached your conclusion, because an examiner will ask.

Let's close on the discipline that makes lists work: hygiene. Designations are not static. Names are added, amended, and sometimes removed when a party is delisted, and each change must flow into your screening promptly.

A delisted party should stop generating blocks, while a brand-new listing, often the highest-risk one, must start catching immediately, and the gap between when a list changes and when your system reflects it is pure exposure. That's why mature programs measure how fast they ingest updates and reconcile their loaded lists against the official source. On the exam, watch for scenarios where a firm screened against an out-of-date list or failed to load a recent designation, the control existed on paper but had quietly stopped working.

Keeping lists current is not an IT afterthought; it's a frontline sanctions control. In the next lecture, we turn from who is sanctioned to what you must do about it: blocking, rejecting, facilitation, and licenses.