Insiders on prediction markets: the Nobel and Maduro cases and what they mean for you

A prediction market price is supposed to sum up what everyone knows. That works well while the information is public and gets uncomfortable when a few people may know the answer early. Two recent cases put this question on the front pages. Prosecutors have since filed charges in one of them, yet neither case has been proven in court. The patterns are still worth understanding.

Case 1: the night before the Nobel (October 2025)

On Polymarket, María Corina Machado's chances of winning the Nobel Peace Prize traded at a few percent. The night before the announcement her price jumped from 3.75% to nearly 73%, partly on bets from new accounts, at least one of which had no prior betting history. She won. The Norwegian Nobel Institute looked into a possible leak, and its director said it was “highly likely” espionage.

Case 2: the Maduro trade (January 2026)

A newly created account put roughly $32,000 into “Maduro out by January 31” while Polymarket priced the odds as low as 5.5%. Within hours, on January 3, US forces captured Maduro, and the account's profit topped $400,000. Days later, Rep. Ritchie Torres introduced a bill barring federal officials and employees from trading such contracts on material nonpublic information. In April 2026 the US Department of Justice charged a US soldier with using classified information about the operation to place the bets. The charges are allegations, and he is presumed innocent unless proven guilty.

Four warning signs

• Fresh wallets. Accounts created days before the event, betting only on that one topic.
• Long shots, big size. Large bets on outcomes the market prices at single-digit percentages.
• Timing. A sharp price move with no public news, shortly before an announcement.
• Secret decisions. Awards, military operations, verdicts and corporate announcements: events where a small group knows the answer in advance.

How to avoid being their counterparty

Every trade on an exchange has a counterparty. When you sell YES at 8¢ on an event decided behind closed doors, the buyer may simply know more than you do. The habits that protect you are boring:

1. Don't chase sudden moves. A price that jumps without public news is information, and it usually belongs to someone else.
2. Keep positions small in secret-decision markets. These are the markets where retail traders most often end up as the “dumb money”.
3. Prefer markets resolved by public information: results, published data, official statements.
4. Pull resting limit orders before scheduled announcements, so you don't become the liquidity for someone who already knows.

Where this is heading

The law on insider trading in prediction markets is moving fast. Platforms, regulators and lawmakers are all responding, and the rules differ by country. Whatever happens next, trading on genuinely non-public information can be illegal, and trading against it usually loses money.