In the Applied Materials case, the chain of events that ended in a $252.5 million penalty did not start with the Entity List. It started with a letter. On 25 September 2020, BIS sent Applied Materials an “is-informed” letter establishing that a license was required for specific ion-implant equipment destined for SMIC (Order, p. 4). Most Korean compliance officers have never had to think hard about what that kind of letter does. This guide is the version I wish every Korean exporter had on file before one arrives.
What an “is-informed” letter is
The EAR gives BIS the power to inform a specific party — individually, by name — that a license is required for a transaction that would otherwise not need one. The mechanism appears in several places in Part 744 (for example, the military end-use/end-user controls at § 744.21(b)). The notice can be delivered by individual letter, by amendment to the EAR published in the Federal Register, or by separate Federal Register notification.
The key concept: an is-informed letter does not change the rules. It changes your obligations under the existing rules, for the specific items, end-users, or end-uses it names. From the moment you receive it, a license requirement attaches to the transactions it covers — even if the items were freely exportable the day before.
Why it is more dangerous than it looks
Three features make the is-informed letter a step-change event, not routine correspondence.
It can reach EAR99 items. The most common misconception is that export controls only bite for “controlled” technology with a specific ECCN. An is-informed letter can require a license for items that are otherwise EAR99 — the catch-all, lightly controlled category most companies treat as unrestricted. In the AMAT matter, the relevant controls reached both ECCN 3B991 items and items designated EAR99. If your compliance screening only flags items with a controlled ECCN, an is-informed letter is exactly the scenario your process will miss.
The universe can expand fast. AMAT’s situation moved from a targeted is-informed letter (specific items, one customer) on 25 September 2020 to a full Entity List designation — a license required for all EAR items to SMIC — on 18 December 2020 (Order, p. 4). Under three months, no grace period. A shipment stream that was permissible can become entirely prohibited between one quarter’s planning cycle and the next.
It establishes knowledge. Once you have the letter, you are on notice. BIS treated 25 September 2020 as the date from which AMAT’s knowledge of its obligations is traced. Acting inconsistently with the letter after receipt is not an innocent oversight; it is conduct with a documented start date.
What the letter does not do — a point of precision
There is a myth worth killing: that an is-informed letter imposes a fixed “first 48 hours” response deadline. It does not. Read 15 C.F.R. § 744.21 and you will find no fixed deadline for the recipient to respond. The only timing reference is an obligation on BIS itself — when notice is given orally, it must be followed by written notice within two working days, signed by the Deputy Assistant Secretary. That two-day clock runs against the government, not against you.
So treat any “first 48 hours” checklist (including the one below) as practitioner best-practice for getting ahead of the problem — not a statutory deadline. The real legal effect is simpler and more serious: a license requirement attaches going forward from notice, and it does not lapse because you were slow to act.
What to do when one arrives — first actions on receipt
This is a recommended sequence, not a regulatory countdown:
- Stop the covered transactions. Freeze any shipment, reexport, or in-country transfer that touches the items, end-users, or end-uses the letter names — including anything in transit you can still hold. Do not “finish the order already in progress.”
- Preserve records. The letter establishes a knowledge date. Every internal communication about the covered transactions from this point is potentially discoverable; manage them accordingly, and do not delete anything.
- Determine the real scope. Identify exactly which items, customers, and end-uses are covered — and check whether any are EAR99 that your normal screening would have passed. This is where most companies under-scope.
- Map the expansion risk. If the named end-user is a plausible Entity List candidate, assume the license universe could widen to all EAR items, and plan for the contingency now rather than after a designation.
- Get qualified counsel before responding. An is-informed letter sits at the intersection of EAR scope analysis and enforcement risk. The response — including any license application — should be built with someone who has handled BIS matters, not drafted reflexively.
The Korean angle
Korean exporters are particularly exposed to the EAR99 surprise because so much of the supply chain assumes that “not high-end” means “not controlled.” It also assumes that Korean assembly or Korean origin provides distance from U.S. controls — an assumption the AMAT order demolished separately (see the companion analysis on why a Korean factory does not shield you from U.S. export law). An is-informed letter is where those two blind spots meet: a notice that can reach lightly controlled goods, finished in Korea, headed for a Chinese customer.
If a letter arrives, the worst response is to treat it as a formality to be filed. AMAT did not ignore its letter — it had a compliance program and over 1,100 license applications on record — and still paid $252.5 million. The letter is the moment the clock starts. Treat it that way.
A Korean-language version follows on Brunch, adapted for Korean compliance teams. This guide is part of a series on the AMAT settlement and Korea–China export-control exposure.