ACDC flags 556 Polymarket wallets as likely insider traders

A new report from the Anti-Corruption Data Collective (ACDC) has identified 556 Polymarket accounts, which it calls “Orcas.”

These accounts reportedly place small, targeted bets on events with low odds and win more than 75% of the time.

What did ACDC find out about Polymarket?

The Anti-Corruption Data Collective (ACDC) has released a report called “Classifying Insider Trading Risk,” which examined 78,496 longshot bets placed by 12,355 wallets on Polymarket. ACDC defines a longshot as a wager of more than $2,500 at a price of 35 cents or less, meaning the outcome has a 35% chance or worse.

From that pool, the researchers carved out four groups: Orcas, Whales, Bots and “Small Fish.” There were 556 reported Orca wallets that bet in only a handful of markets and topics, yet they won at a very high success rate above 75%.

Whales, at 3,278 wallets, trade at high volume across many markets. Bots, 760 of them, look at least partly automated, while the remaining 7,761 accounts are the Small Fish.

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