Position Sizing: The Only Edge You Fully Control

Every part of trading involves uncertainty except one. Entries can be early, targets can be missed, theses can be wrong — but the amount you risk on a trade is decided by you, in full, before any of that happens. Sizing is the only lever with no variance on it. It deserves more attention than it gets.

The arithmetic of drawdowns is not symmetric

Lose 20% and you need 25% to get back to even. Lose 50% and you need 100%. This asymmetry is the whole argument for small, consistent position sizes: the penalty for oversizing compounds faster than the reward for being right. A strategy with positive expectancy can still ruin an account if individual positions are large enough for a normal losing streak to dig a hole the math can't climb out of.

Fixed-fraction sizing, in one paragraph

Risk a fixed, small percentage of your account on every trade — for defined-risk options positions, that's simply the premium as a percentage of equity. When the account grows, position size grows with it; when you're in a drawdown, size shrinks automatically. It is self-correcting in exactly the direction you want: pressing when things work, easing off when they don't, with no willpower required.

• ✓Decide the risk percentage before the market opens, not during a trade.
• ✓Count correlated positions as one position — five bullish tech trades is one bet on tech.
• ✓A losing streak at your normal size is information; a losing streak at double size is damage.
• ✓If a single loss would change how you trade tomorrow, the position was too big.

Signals tell you where the odds are favorable. Sizing decides whether you're still around when the odds pay off.

This is why every setup in the terminal ships with a time frame and defined-risk structures rather than a dollar amount: the right size is a function of your account, not our conviction. The system can find the trade. Only you can size it.