Findings from 3 research papers on stop losses

Findings from 3 research papers on stop losses

From a 2015 post at Quant Investing, a look at 3 research papers on the use of stop losses.

Study 1: When do stop loss rules stop losses?

What they also found was that the stop-out periods were relatively evenly spread over the 54 year period they tested. This shows you that the stop-loss was not just triggered by a small number of large market movements (crashes).

Study 2: Stop Losses, Trailing, and Buy & Hold compared

Trailing better than traditional
Only at the 5% and 10% loss levels did the traditional stop-loss perform better than the trailing stop-loss. At all other loss levels the trailing stop loss out performed, most notably at the 20% loss level where it performed 27.47% better over the 11 year period.

Study 3: Stop Losses in Momentum Investing

The stop-loss momentum strategy also completely avoided the crash risks of the original momentum strategy as the following table convincingly shows.

Click image to enlarge

NoteĀ that if you followed a stop loss strategy you would have made a small profit when the momentum only strategy lost nearly 50% and 40%.

The studies actually convinced the author to change is opinion on stop losses:

This has been a rather long article to come to a very clear and simple conclusion: Stop-loss strategies work

As you have seen:

  • When applied to a 54 year period a simple stop-loss strategy provided higher returns while at the same time lowering losses substantially
  • A trailing stop loss is better than a traditional (loss from purchase price) stop-loss strategy
  • The best trailing stop-loss percentage to use is either 15% or 20%
  • If you use a pure momentum strategy a stop loss strategy can help you to completely avoid market crashes, and even earn you a small profit while the market loses 50%
  • Stop-loss strategies lowers wild down movements in the value of your portfolio, substantially increasing your risk adjusted returns

via Truths about stop-losses that nobody wants to believe at Quant Investing for Value, Momentum, Quality and Growth stocks

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