A 70% probability sounds reassuring. Until it resolves at 0% and you’ve staked a large share of your capital on it. Even the best-researched prediction market trade carries uncertainty — and the traders who survive long-term are not necessarily those with the best predictions, but those with the best risk management. Here’s how to structure your approach to protect capital while staying positioned for returns.
Position Sizing: The Fundamental Rule
Never stake more on any single prediction market position than you can afford to lose completely. This sounds obvious, but traders consistently violate it when they have high conviction.
A common professional framework is to limit any single position to 2-5% of your total prediction market capital. At 5% per trade, you can lose 20 consecutive positions before losing your initial capital — an unlikely scenario if you’re doing reasonable research, but not an impossible one.
Adjust position size based on your edge confidence, not just your directional conviction. A 70% event where you have extensive research supporting your view warrants a different size than a 70% event where you’re going with your gut.
Diversification Across Event Types
Prediction market portfolios are subject to correlated risk in ways that aren’t always obvious. A large political event — a US election, a central bank decision — can simultaneously move dozens of seemingly unrelated markets.
If you are heavily positioned in US political markets, an unexpected election result doesn’t just affect your election positions. It can move economic markets, crypto markets, and geopolitical markets simultaneously.
Diversify across uncorrelated event categories: hold some political positions, some sports markets, some economic data trades. Prediction Terminal’s category view makes it easy to see where your exposure is concentrated across the market landscape.
Using Platform Diversification to Reduce Concentration Risk
Trading across multiple platforms — Polymarket and Kalshi — is not just about finding the best odds. It also reduces platform concentration risk. If one platform faces a technical outage, a regulatory challenge, or a liquidity crisis, your entire portfolio is not affected.
Platform diversification is particularly important for traders with significant capital deployed. Keeping all positions on one platform exposes you to a single point of failure in ways that are entirely unrelated to your market analysis.
Hedging Positions When the Market Moves
One of prediction markets’ most underused features is the ability to hedge. If you bought a YES outcome at 30% and the market has moved to 55%, you have two choices: hold and wait for resolution, or sell part of your position to lock in a portion of the gain.
Partial selling — selling enough YES contracts to recover your original stake — is a legitimate risk management technique. It leaves you with a “free” remaining position: whatever you hold is pure upside.
Similarly, if a market moves against you but you still believe your original thesis, averaging down carefully — not recklessly — can improve your average cost. But only do this with pre-committed capital, not by improvising.
Keep a Trading Log
The most disciplined prediction market traders track every position: entry price, notional invested, thesis, resolution criteria, exit price, and outcome. Over time, this log reveals patterns — which event categories you outperform in, where you consistently lose, what types of theses hold up under scrutiny.
Without a trading log, you’re making the same mistakes repeatedly without knowing it. With one, each trade becomes data that makes your next trade smarter.
Start small, manage your risk carefully, and use Prediction Terminal to stay across odds and notional values in real time.
Frequently Asked Questions
What is a safe position size for prediction market trading?
A common professional framework limits any single position to 2-5% of total trading capital. This allows for a long string of losses without catastrophic drawdown, while keeping meaningful exposure to winning positions.
How do you hedge a prediction market position?
Partial selling — selling a portion of your position once the market has moved in your favor — is the most common hedging technique. Selling enough to recover your original stake leaves you with a risk-free remaining position.
Why should you trade across both Polymarket and Kalshi?
Beyond finding better odds, trading across multiple platforms reduces platform concentration risk. A technical outage, regulatory action, or liquidity issue on one platform won’t affect your entire portfolio.