Capital Loss

loss of equity

In finance, a capital gain is profit that results from the sale or exchange of a capital asset over its purchase price. If the price of the capital asset has declined instead of appreciated, this is called a capital loss. Capital gains occur in both real assets, such as property, as well as financial assets, such as stocks or bonds.
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Noun
1. the amount by which the purchase price of an asset exceeds the selling price; the loss is realized when the asset is sold
(hypernym) financial loss

The difference between the net cost of a  security and the net sale price, if that  security is sold at a loss.