7 Polymarket Trading Strategies Used by Top Traders

The top traders on the Merlin leaderboard don’t rely on luck — they use systematic strategies refined through thousands of trades and millions in volume. By analyzing their trading patterns, we’ve identified seven distinct strategies that consistently produce positive returns on Polymarket.

1. Event-Driven Trading

Event-driven trading is the most popular strategy among Whale-tier traders. The approach is straightforward: build positions before known catalysts and profit from the resulting price movements.

How it works:

Identify upcoming events that will resolve or significantly impact a market (elections, economic data releases, court decisions)
Analyze the current market price versus your assessment of the true probability
Enter positions before the event, when prices still reflect uncertainty
Exit or let positions resolve after the catalyst

Example: Before a Federal Reserve rate decision, a trader might notice that the market prices a rate cut at $0.35 (35% probability), while their analysis of recent economic data suggests a 50% probability. Buying at $0.35 provides significant expected value if their assessment is correct.

The key risk is that events can surprise in unexpected ways. Top traders manage this by sizing positions proportionally to their confidence level — never betting the farm on a single event.

2. Contrarian Betting

Contrarian traders look for situations where the crowd is wrong. This often happens in markets driven by narrative rather than fundamentals, or when recent news has pushed prices to emotional extremes.

Signs of a contrarian opportunity:

A price that moved sharply on speculation rather than confirmed information
Markets where public sentiment (social media, news) diverges dramatically from historical base rates
“Obvious” outcomes that are overpriced because everyone is piling in

Traders flagged by the Merlin Insider Score frequently employ contrarian strategies — they profit precisely because they bet against consensus on low-probability outcomes that end up resolving in their favor.

Risk management: Contrarian positions can stay wrong for a long time before the market corrects. Successful contrarian traders use small position sizes on individual bets and spread their capital across many opportunities.

3. Market-Making

Market-making is a more advanced strategy where traders provide liquidity by placing both buy and sell orders, capturing the bid-ask spread as profit.

How it works:

Place a buy order at $0.48 and a sell order at $0.52 on the same outcome
When both orders execute, you earn $0.04 per share regardless of which direction the market moves
Repeat continuously across multiple markets

Advantages:

Profit doesn’t depend on correctly predicting outcomes
Income is relatively steady compared to directional trading
Works best in high-volume markets with stable prices

Challenges:

Requires constant monitoring and order management
Adverse selection risk — informed traders may pick off your orders before you can adjust
Sharp price movements can result in holding large, unwanted positions

On the Merlin leaderboard, market-makers are often identified by high volume relative to P&L — they trade frequently but with lower margins per trade.

4. Cross-Market Arbitrage

When related markets exist on Polymarket, their prices should be mathematically consistent. When they’re not, arbitrage opportunities appear.

Common arbitrage scenarios:

Complement markets: If “Will Bitcoin hit $100K?” is at $0.60, then “Will Bitcoin stay below $100K?” should be near $0.40. If it’s at $0.45, you can buy both complements for $1.05 and lock in a $0.05 loss — or sell both for a guaranteed profit.
Multi-outcome inconsistency: In a market with five candidates, if prices sum to $1.08, some outcomes are collectively overpriced.
Related events: If “Democrats win the presidency” is at $0.55 and “Democratic candidate wins popular vote” is at $0.50, there may be a logical inconsistency to exploit.

Arbitrage opportunities are rare and fleeting — they require fast execution and the ability to spot inconsistencies across many markets simultaneously.

5. Information Edge Trading

Some of the most profitable traders on the Merlin leaderboard earn their returns through superior information processing. They don’t have illegal insider information — they simply analyze publicly available data faster and more accurately than the crowd.

Sources of information edge:

Domain expertise (a political scientist trading on elections, a crypto developer trading on DeFi events)
Better data sources (proprietary polling models, real-time economic indicators)
Faster processing (monitoring news feeds, social media signals, and on-chain data in real time)
Analytical frameworks (Bayesian updating, historical base rates, conditional probability models)

The Insiders page on Merlin surfaces traders who consistently demonstrate information edge — their positions move before major price changes, suggesting they process relevant signals faster than the market.

6. Portfolio Diversification

Rather than concentrating capital in a few markets, diversified traders spread their bets across many markets with positive expected value.

The math behind diversification:

If you have 20 bets each with +5% expected value, your portfolio’s expected return is still +5%
But the variance (risk) decreases with each additional uncorrelated bet
Over time, the law of large numbers means your actual return converges toward the expected value

Implementation:

Maintain positions in 10-30 markets simultaneously
Limit any single market to 5-10% of total capital
Prefer uncorrelated markets (politics + sports + crypto rather than multiple related political markets)
Rebalance as new information changes expected values

Traders with consistently high ROI and Merlin Trader Score often use diversification — their equity curves show smooth upward trends rather than volatile swings.

7. Resolution Timing Arbitrage

As markets approach their resolution date, prices converge toward $0.00 or $1.00 as uncertainty decreases. Timing traders exploit the predictable pattern of this convergence.

Strategy variations:

Early entry: Buy positions in markets where the outcome seems likely but distant. A market at $0.75 six months before resolution might drift to $0.90 as certainty increases, even without new information.
Late-stage value: Some markets underprice near-certain outcomes close to resolution. Buying at $0.95 for a near-guaranteed $1.00 payout is a 5% return, which can be attractive for short holding periods.
Time decay selling: If you hold a winning position, sell gradually as the price approaches $1.00 rather than waiting for full resolution — this frees capital for new opportunities.

Combining Strategies

The most successful traders on the Merlin leaderboard typically combine multiple strategies rather than relying on a single approach. A common combination:

Use event-driven trading for core positions in markets they understand deeply
Apply diversification to spread risk across categories
Employ contrarian betting selectively when crowd sentiment seems extreme
Use resolution timing to manage entries and exits

Learning from Top Traders

The best way to develop your own trading strategy is to study successful traders:

Visit the Merlin leaderboard and identify traders with high Merlin Trader Score ratings
Click through to their profiles to see their current positions and 90-day performance charts
Look for patterns — do they concentrate in specific categories? Do they favor longshots or favorites?
Check the Insiders page for traders with information edge
Consider following proven traders via the Merlin Telegram bot copy-trade feature

Remember: every strategy has periods of underperformance. The key is finding an approach that matches your risk tolerance, time commitment, and domain expertise — then executing it consistently over hundreds of trades.