Stops, Scaling, and Position Size — Risk Management

The most-quoted rule in trend following is "let your winners run, and cut your losses short." That second half — cutting losses short — is risk management. However good your stock selection, without it a few large losses will sink the account. And even with ordinary selection, disciplined risk keeps you alive for the next opportunity. Risk management isn’t optional; it’s the precondition for survival.

Why losses must be cut short — the asymmetry of recovery

Loss and recovery are not symmetric. Lose 10% and you need +11.1% to get back; lose 50% and you need +100%. The deeper the loss, the exponentially harder the recovery.

−10% → +11% to recover | −25% → +33% | −50% → +100%

That’s why most trend followers cap the loss on any single trade at 7–8%. Cut it mechanically before that line and one mistake never compounds into irreversible damage.

Set the stop before you buy

The most important rule of stops: decide the stop before entering. Set it after buying and, the moment you’re underwater, the "just a little longer and it’ll come back" instinct keeps pushing the line lower. Before you click buy, define the level that says "if this breaks, my thesis is wrong." Common stops sit below the prior low or below a 50-day-line break.

Position size — where real risk control lives

Many equate risk management with the stop alone, but the more fundamental lever is position size. How much of the account you commit to a name determines the hit the whole account takes when the stop triggers. A common approach fixes the loss on any single stop at a set fraction of the account (say 0.5–1%).

Example: a $10,000 account capping single-trade loss at 1% ($100). If the stop sits 8% below entry, the position size is $100 ÷ 8% = $1,250. The closer the stop (the smaller the risk), the larger the position; the farther, the smaller.

Scale in and out to ease the decision

Buying and selling all at once bets everything on a single decision. Scaling eases that. Enter part on the breakout and part on confirmed support; exit part into a sharp run-up and the rest when the trend breaks. Especially in a winning position, not selling the whole thing while the trend lives is how you "let winners run."

Selection and risk are one package

The two pillars of trend following are stock selection and risk management. Trend Screener automates the first half — objectively narrowing strong candidates. But stops, position size, and scaling are entirely yours. After you get a good candidate list, always design the "what if I’m wrong" scenario first, then enter. That’s the only way to last in the market.