Highest ROI trades on Polymarket
The biggest return-on-cost trades that hit — someone took a long-shot position and it paid. Ranked by ROI (profit ÷ cost), from every resolved position on-chain. Click any trader to explore their full history.
Top trade
gr…in turned $989.05 into $11.2K
10.4× ROI
| # | Trader | Market | Entry | Cost | Profit | ROI | |
|---|---|---|---|---|---|---|---|
| 1 | gr…in | S&P 500 (SPX) Opens Up or Down on May 18? | 8.8¢ | $989.05 | +$10.2K | 10.4× | May 18, 2026 |
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ROI = realized profit ÷ cost basis on a single resolved position. Past performance does not predict future results. Not financial advice.