The story
Domer has traded prediction markets for about a decade and became the archetype of the Polymarket professional: in 2024 he was described as the platform's top trader by both volume and profit, with around $300M traded across more than 5,000 markets.
The style is the opposite of a one-shot whale. Domer spreads attention across thousands of questions, sizes where the price looks wrong, and lets a long record of small edges add up.
He now trades under the username ImJustKen — the profile links his @Domahhhh X account. His biggest win on record is a long shot: Kevin Warsh as Trump's Fed-chair pick, bought at around 4¢.
