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Adding and trimming: managing position size over time

A position doesn't have to stay the size you bought. Good traders add to what is working and shrink what isn't. Done well, this puts most of your money in your best stocks and very little in your worst.

Lesson 72 of 76 · 3 min read

Pyramiding: adding to winners

Pyramiding means adding shares to a position only after it shows a profit, in smaller and smaller amounts. The idea is that the market is confirming your decision. A common pattern looks like this:

Why not average down

Averaging down is the reverse: buying more of a stock as it falls to lower the average price. The stop-loss lesson explained why it turns small losses into big ones. In portfolio terms it is just as harmful: it moves money from your strongest ideas into your weakest one and raises your portfolio heat exactly when the stock is telling you that you are wrong.

A simple test: would you buy this stock right now if you didn't already own it? If not, don't add.

Scaling into a position

Scaling in protects you when you are unsure. Say your full position is $5,000 on a $25,000 account. Instead of buying $5,000 at once, you buy $2,500. If the stock fails, you lose half as much. If it works, you add the rest at slightly higher prices. You give up a little profit on the winners in exchange for much smaller losses on the trades that fail right away, and most failed breakouts fail quickly.

When you add, raise the stop for the whole position so the total risk stays within your plan.

Trimming into strength and cutting laggards

Trimming means selling part of a position. The taking profits lesson covered selling into strength at 20% to 25%. In a portfolio, many traders sell a third or half at that point and let the rest run with a raised stop. You lock in a gain and keep a chance at a bigger move.

When you need room, for example to buy a new leader, sell the laggard first: the position that has gone nowhere or is losing. It's tempting to sell the winner because it feels good to book the profit, but that leaves you with your worst stocks. A position that has done nothing for several weeks while the market rose is taking up space a better stock could use.

Rebalancing

Winners grow and can end up dominating the account. If one stock rises from 15% to 35% of your portfolio, one bad gap now hurts twice as much. Rebalancing means trimming oversized positions back toward your target size and, when appropriate, putting the cash into new setups. Set a simple rule, for example trim when any position passes 25% to 30% of the account. Check sizes weekly in your Portfolio.

Adding and trimming at a glance

AddOnly to positions showing a profit, in smaller amounts
Average downNever
First buyOften half a position
TrimPart of the position into strength, e.g. at 20% to 25%
Need cash?Sell the laggard first
RebalanceWhen one position grows far past its target size

Common mistakes

  • Adding bigger amounts on each buy, which pushes the average cost up near the current price.
  • Buying more of a losing stock to get back to even.
  • Selling the best stock to fund a new idea while keeping the laggards.
  • Letting one winner grow into half the account without a plan.

Key points

  1. Add only to winners, in decreasing amounts, and never average down.
  2. Trim into strength and cut laggards first when you need room.
  3. Rebalance positions that grow far beyond their target size.

Check what you learned

Answer at least 2 of 3 correctly to complete the lesson.

1. Which is an example of pyramiding?

2. You need cash for a new leader. You own one stock up 18% and one flat for six weeks. Which do you usually sell first?

3. One stock has grown to 35% of your account. What does rebalancing suggest?

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