The 100% drone tariff was signed after the close. We alerted.
At 21:29 UTC on Thursday, August 13, 2026, knowfir.st read a freshly signed presidential proclamation off the White House actions feed and mailed subscribers the take. That was 5:29 p.m. in New York, an hour and a half after the close. The document put tariffs of up to 100% on imported drones, and by Friday's close every import-competing drone maker in the complex had repriced upward while the S&P 500 slipped 0.2%.
That sequence is the whole story. A market-moving document landed on a public feed after hours, the read on it was in subscriber inboxes the same evening, and the next session priced it.
The receipt
Here is the delivered take, sent Thursday, August 13 at 21:29 UTC, verbatim from our archive:
"The President signed a Section 232 proclamation imposing 100% ad valorem tariffs on UAS weighing over 25 kg, UAS with thermal imagers, and UAS docking stations, plus 25% duties on smaller consumer/commercial drones lacking thermal imaging, with a delayed phase-in for certain critical components and a Commerce-administered onshoring exemption program."
UAS is the government's term for drones, and Section 232 is the national-security tariff authority. The proclamation itself was signed at 21:21 UTC. Eight minutes later the alert was out, and it named the mechanism plainly:
"Domestic drone pure-plays — AeroVironment (AVAV), Joby Aviation (JOBY), and Kratos (KTOS) — could benefit from import displacement; Skydio (private) is also a primary beneficiary."
Import displacement. A 100% duty on a competitor's hardware is a subsidy to whoever builds the same thing domestically. That is the entire thesis, and it was written down before a single share traded on it.
That chart is Unusual Machines, a small maker of NDAA-compliant drone parts that The Motley Fool described as the highest-profile all-American parts supplier around. It finished Friday up 25.0%, the largest move in the complex. The alert called the category and the mechanism; the market found the purest expression of that mechanism on its own. Both halves of that sentence are worth sitting with, and we will come back to the second one.
What Friday actually did
The complex moved together and the index did nothing. Unusual Machines finished up 25.0%, Red Cat 8.8%, Kratos 2.9%, Northrop Grumman 1.9%, AeroVironment 1.8% and Textron 1.1%. SPY slipped 0.2%. Same session, same document on the wires, and the lift concentrated in exactly the names whose revenue competes with imports.
Read that chart by market cap and it tells you something the headline rate does not. Northrop and Textron are diversified primes with drone lines; drones are a rounding error inside their revenue, and they moved about two percent. Unusual Machines is a drone-parts company and close to nothing else, and it moved twenty-five.
Tariff protection prices by concentration, not by size. The same document is worth a fraction of a percent to a prime and a repricing to a pure play, which is why "who benefits" and "who benefits most" are different questions with different answers.
The alert answered the first question in eight minutes. The second question - which of the exposed names is purest - is the one the market spent Friday answering, and neither Unusual Machines nor Red Cat was on our list when it did. We have since changed how the analyst hunts for concentrated small-caps on exactly this kind of product-scoped policy. That is the honest ledger for this one: mechanism right, timing early, the two biggest movers unnamed.
Joby, one ticker we did name, builds electric air taxis. It does not compete with imported camera drones, so a tariff wall around DJI-class hardware does little for its income statement. Joby also carried its own weight that week: it had announced a $500 million acquisition of Resonant Sciences alongside a plan to issue up to $750 million in new stock, and per The Motley Fool's coverage the dilution concern was already pressing on the shares on August 11.
The market did not buy the list. It sorted the list by exposure to the specific mechanism and priced each name accordingly, which is what you would want it to do, and a useful reminder that a ticker in an alert is a starting point for your own work, not a conclusion.
Reality check
The complex came into Thursday hot. NDAA-compliant drone names had posted double-digit weekly gains the week before, a run one market roundup tied to defense-budget drone procurement money, and Unusual Machines itself had reported $16.7 million in quarterly revenue on August 6, up 687% year over year. Some of Friday's energy surely belongs to that momentum, and one session across a handful of names is a small sample. So the honest version of the claim is about timing rather than causation: the proclamation, and our read of it, were on the record hours before the session that repriced the group. Whether the tariff explains every tick of Friday is a harder question, and the prior week's rally argues for humility about it.
What phases in from here
The 100% and 25% rates take effect September 3, 2026. Products from the EU, Japan, Korea, Taiwan, Switzerland and Liechtenstein are capped at 15%, the UK at 10%, and a further 25% duty on additional components arrives February 9, 2027. Commerce is also standing up an onshoring program that gives duty relief to companies committing to build U.S. drone plants. The schedule keeps landing in pieces, each piece is a document on a public feed, and how much of it is already in these prices is unknowable in advance.
The measurement window in this piece runs from the August 13 close to the August 14 close, because the document and the alert landed between them. As of this writing on Sunday, August 16, Friday's close is the latest print; markets have not traded since. Nothing here is investment advice, and the hindsight arithmetic on any single name is exactly that hindsight, on one selected example, over one session.
Thursday night the proclamation sat on a public feed for anyone to read. Friday morning the market read it. The gap between those two moments is where the entire idea of knowing first lives, and this week the gap was one full evening. What was in your inbox at 21:29?
Get the next one while it is still a document. knowfir.st watches more than 30 primary sources, the White House actions feed among them, and emails subscribers the ones that matter with a short read on why, minutes after they drop. The live median delivery time is published on the homepage, and your first feed is free.