Scale In / Scale Out

Scaling in and scaling out mean building a position gradually rather than placing one single order for the whole amount you intend to trade. Instead of buying your full 100 shares at once, you might buy 25, see how the trade behaves, then add another 25, and so on. Scaling out is the same idea in reverse: instead of selling everything at one price or one moment, you sell a portion now and the rest later as the trade develops.

The mechanics are simple. A trader decides on a total position size in advance — say 100 shares — and a plan for dividing it into pieces, often called "tranches" or "clips" (25%, 33%, 50%, etc.). Entries are added as the trade confirms itself, for example if price moves in the trader's favor or a level breaks. Exits are taken in pieces too, often to lock in some profit early while leaving the rest of the position open in case the move continues.

The nuance that trips people up is the direction of "confirms." Some traders scale in as the trade goes their way, adding to strength — this is different from adding to a position that is losing money to lower the average entry price, which is a much riskier practice sometimes called averaging down and is not what scaling in typically means. Scaling in and out is about position management and controlling risk in pieces, not about rescuing a bad entry.

It's also worth noting that scaling in and out increases the number of trades and therefore commissions, spread costs, and complexity — a trader needs a clear plan for tranche sizes and trigger points, or the practice becomes an excuse for hesitation rather than a deliberate risk tool.