Pete Hegseth bans Defense Department staff from prediction market trades

On 20 October, Pete Hegseth issued a memo. It prohibited every Defense Department employee — uniformed personnel, intelligence professionals, civilian staff — from trading event contracts using nonpublic information, whether classified or not. The timing was deliberate: days before the midterm elections, with prediction markets handling volumes that would have been unimaginable to regulators five years ago.

The memo named Kalshi and Polymarket directly. That is not incidental. When a Cabinet secretary names specific platforms in a prohibition memo, those platforms have become large enough to worry a national security apparatus. That is a different kind of legitimacy than a CFTC registration.

The backdrop is specific. In April, a grand jury indicted Gannon Van Dyke, a US special forces soldier, on charges that he used classified intelligence about a military operation in Venezuela to trade on Polymarket, reportedly netting over $400,000. Hegseth's memo draws the operational logic explicitly: a position taken on a market by someone with advance knowledge of a military outcome creates a signal. Hostile intelligence services don't need to break encryption. They watch the order flow.

This is an information asymmetry argument, and it is a serious one. Prediction markets derive their value from aggregating dispersed private knowledge. The mechanism that makes them accurate is also the mechanism that makes them exploitable. Hegseth's memo doesn't resolve that tension — it just draws a line inside the federal workforce and calls it done.

The consensus reading treats this as regulatory pressure, another front in the same legal siege that has Kalshi fighting subpoenas in Manhattan and defending its swap arguments in the Sixth Circuit. I don't think that's where this lands. The memo is not regulation. It cannot bind platforms, cannot set contract rules, cannot determine what the CFTC permits. What it does is establish, in writing, that the executive branch now views prediction markets as part of the national security information environment. That framing will outlast this administration regardless of how the circuit split resolves.

Van Dyke's indictment is the mechanism the memo was written around. The Justice Department moved on that case under existing securities and fraud statutes, not under any prediction-market-specific authority. The implication is that the legal tools to prosecute misuse already exist. What Hegseth added is the internal prohibition — the attempt to stop the trade before the information leaks into the market at all.

Whether the memo changes platform behavior is a different question. Kalshi and Polymarket have no way to screen for security clearances at account opening. The enforcement burden falls entirely on the military chain of command, and on the Justice Department after the fact. The Van Dyke prosecution is now the precedent every cleared official has been shown. That precedent is doing the work the memo cannot.