Scale-In

A trading strategy of building a position gradually by purchasing shares in smaller increments over time rather than all at once.

Scaling in is a risk-management strategy where an investor builds a target position size by executing multiple smaller purchases over time or at different price levels, rather than deploying all allocated capital in a single transaction. This incremental approach allows investors to establish a baseline position and adjust subsequent purchases based on how the asset's price behaves, helping to smooth out the entry price in volatile markets. Investors typically use this strategy to mitigate timing risk. If the asset's price drops after the initial purchase, the investor can buy more shares at a lower price, which lowers their overall average cost basis. Conversely, if the price rises, it validates the investor's positive thesis, allowing them to add to a winning position, albeit at a higher average cost. This systematic entry helps remove the emotional stress of trying to perfectly time the bottom of a market cycle. While scaling in is highly effective for managing downside risk, it has potential drawbacks. If an asset immediately rallies sharply after the first small purchase, the investor misses out on the larger gains they would have achieved had they deployed 100% of their capital at the start. Additionally, executing multiple smaller trades can lead to higher transaction costs or commissions depending on the brokerage platform used.

An investor wants to allocate $10,000 to a stock currently trading at $100. Instead of buying 100 shares at once, they scale in. First, they buy 25 shares at $100 ($2,500). The stock price falls to $95, so they buy another 25 shares ($2,375). The stock falls further to $90, and they buy the remaining 50 shares ($4,500). In total, they spend $9,375 ($2,500 + $2,375 + $4,500) to acquire 100 shares, resulting in an average cost basis of $93.75 per share ($9,375 / 100) instead of $100.