Highest ROI trades on Polymarket
The biggest return-multiple trades that hit — someone took a long-shot position and it paid. Ranked by ROI (realized profit ÷ gross traded notional), from every resolved position on-chain. Click any trader to explore their full history.
Top trade
gr…in made $9.6K on $506.36 of gross traded notional
18.9× ROI
| # | Trader | Market | Entry | Notional | Profit | ROI | |
|---|---|---|---|---|---|---|---|
| 1 | gr…in | S&P 500 (SPX) Opens Up or Down on September 4? | 3.7¢ | $506.36 | +$9.6K | 18.9× | Sep 4, 2026 |
| 2 | gr…in | S&P 500 (SPX) Opens Up or Down on May 18? | 8.8¢ | $989.05 | +$10.2K | 10.4× | May 18, 2026 |
| 3 | su…ro | Will Meta reach $700 in January? | 9.8¢ | $616.63 | +$5.7K | 9.2× | Jan 29, 2026 |
| 4 | or…07 | Will Anthropic have the best AI model at the end of February 2026? | 11.0¢ | $999.96 | +$8.1K | 8.1× | Feb 28, 2026 |
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ROI = realized profit ÷ gross traded notional on a single resolved position — the denominator is the Notional column (buy cost basis plus sell proceeds), not the cost basis. Profit is gross of fees. Past performance does not predict future results. Not financial advice.