Risk management begins by defining what can be lost before a position is opened. It cannot remove uncertainty, guarantee a stop fill, or prevent a loss from exceeding the plan. Its purpose is to make assumptions and boundaries explicit.
Define Invalidation Before Size
Write the condition or price level that would make the original setup no longer valid. Then calculate per-share risk from the planned entry and invalidation. Position size comes from the loss budget divided by that distance, subject to buying power, liquidity, concentration, and event risk.
If a defensible invalidation produces an impractical size, reduce the loss budget, wait for a different structure, or skip the idea. Moving the invalidation only to make a preferred share count fit reverses the process.
Understand What a Stop Can and Cannot Do
A stop order becomes an instruction to the broker when its trigger condition is met; it does not guarantee execution at the trigger price. Gaps, halts, fast markets, and thin liquidity can produce a different fill. Review the broker’s order behavior and include slippage in the plan.
Measure Portfolio Risk, Not Just One Trade
- total planned loss across open positions;
- sector and factor concentration;
- symbols exposed to the same event or market move;
- overnight and scheduled-event risk;
- short-sale borrow, recall, and squeeze risk where applicable.
Several individually small positions can form one large correlated exposure. A daily loss boundary can help stop new risk from being added, but it cannot cap a gap or force a broker action unless the broker itself provides that control.
Separate Plan Changes From Rule Breaks
New information can legitimately change a plan. Record what changed and when. If no new evidence exists, widening an invalidation or adding size may simply be a deviation. Use neutral language so the behavior can be grouped later.
Review Planned Versus Realized Loss
Compare the planned entry, size, invalidation, and maximum loss with actual fills and realized results. Repeated gaps can point to unrealistic stop assumptions, poor liquidity filters, late entries, or missing fees. A single outcome does not prove the rule worked or failed.
How MAC Terminal Supports Risk Review
Guardrails calculates a planned position size from manual account, entry, stop, and risk inputs and records daily boundaries. It cannot enforce orders at a brokerage. Scanner candidates may include reference levels, but members must verify the setup, liquidity, and invalidation. The Journal calculates R-multiples and rule-based behavior flags from recorded trades for later review.
Educational only, not individualized financial advice. Actual losses can exceed planned losses, and no risk rule guarantees capital preservation or profitability.