Whale activity flagged on Polymarket's Thunder-Spurs and Iran ceasefire markets in consecutive days
Whale activity was flagged on two separate Polymarket contracts within consecutive days in late May 2026, according to ChainCatcher and Catcher Predict. On May 24, significant financial movements from a large investor were detected on Polymarket's Thunder vs. Spurs playoff market, though no trade size, odds impact, or investor identity was disclosed. On May 25, on-chain data monitored by Catcher Predict showed significant capital movements by a single large whale in a market on whether the US and Iran will reach a permanent peace agreement. The same day, a second ChainCatcher report also flagged whale activity on the US-Iran peace agreement market. Neither source provided dollar amounts, position direction, price impact, or trader identity for either market.
Polymarket must now defend against six concurrent federal and journalistic probes into its Iran-linked contracts. Any fresh surveillance gap revealed by this whale activity could harden bipartisan House support for binding federal registration requirements before the Senate-passed account-exclusion legislation reaches a floor vote.
Polymarket's running surveillance exposure now spans Iran military contracts, congressional insider-trading probes, and sports market whale activity, with five federal and journalistic investigations already scrutinizing wallet clusters across its political and athletic verticals.