Ability to restamp an investment that’s doing well so that the percentage displayed resets to 0%
This way you can see how it does from that point onwards when looking at the portfolio page. When selecting the investment overreview page can still show the overall gain as well as the change since you stamped it.
Has the same effect of selling and then rebuying, without the hassle.
Useful since if say a really good investment up at +100% drops to +90%, the loss from the point when it was +100% would actually be -5% since you are taking the higher value as the new base.